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ELECTRONIC TECHNICIAN/DEALER

LEADING THE CONSUMER AND

INDUSTRIAL SERVICE MARKETS

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IRDUSTRY REPORT

Admiral Vacates Mexican Market Admiral, which recently announced plans to close its U.S. television manufacturing operations, has now decided to vacate its Mexican TV facilities also.

In a brief statement from parent Rockwell International, Admiral said it

has sold Admiral de Mexico to Grupo Industrial Alfa S.A. of Monterrey, Mexico. The later group will make television sets under the Admiral name.

Admiral de Mexico has been making color and black and white television and stereo systems for the Mexican market.

RCA Marks 50 -millionth TV On the right is the first television set produced by RCA-a 10 -inch black and white receiver-in 1946. On the left- some 32 years and 49,999,999 sets

later-is a current version of an RCA 19 -inch ColorTrak receiver. On the pricing front, the first set retailed for $375 while the new color chassis sells for $570.

ISCET Battle Expands Amid charges and countercharges the battle between the NESDA originated ISCET program (International Society of Certified Electronic Technicians) and the dissident ETA (Electronic Techni- cians Association) continues to grow hotter.

An internal rift within ISCET resulted in NESDA's firing then ISCET officers Jesse B. Leach and Leon Howland and the relieving of ISCET educational director Ron Crow (see ET/D, January).

However, when it was announced by ETA supporters that they planned to sponsor a competing certification program for electronic technicians and that it would be called the International Soci- ety of Certified Electronic Technicians, Incorporated, the charges between the officers and the confusion in the ranks became even thicker.

According to a news release received by ET/D, Forest Belt, CET, an electronics industry educator, has been ap-

pointed acting ISCET chairman to replace Leach and Larry Steckler, CET, editor of Radio -Electronics magazine, will serve as vice chairman.

As chairman, one of Belt's first actions was to disavow any association between ISCET and the competing group. "Our society operates, the way it always has, as a branch of the National Elec- tronics Service Dealers Association." Belt added, "All they can do is tear down or play catch-up. The tear -down game has already damaged their own credibil- ity. As for catch-up, they are lost before they begin. ISCET now has more technical, promotional, and developmental clout and talent than at any time in its history ... we are rising fast."

Meanwhile, Dick Glass, former NESDA executive director and president of the newly formed ETA contends the group already has 300 members and some 150 "proven" test monitors for their certification program. "The response has been really good so far and we were unaware of the strong feelings for such an independent technician's association-or of the large number of employee techs who would join an association that is devoted to something other than TV repair alone."

Glass also announced appointment of additional officers. He said D.C. "Snow" Larson, CET, of Houston, Tex., will serve as vice chairman of ETA, and Crow will head the new group's certification program.

In a statement from ETA headquarters, Crow said the new program is "already underway" with more than 125 monitors through the United States and in some foreign countries. "The break away from NESDA marks the beginning of a new and better era for electronics technicians and is expected to spur the technician certification program ... to much higher levels of recognition and importance to the industry," Crow said.

Gould Announces National Distributor Program Gould Inc., has announced that it plans to implement a national distributor program for its lower -end osciloscopes.

According to a Gould spokesman, negotiations are now underway with various electronic distributors who would take on the Gould line of scopes in the $595 to $995 price range. Product Sales Manager Richard Bowman said the scopes are portable, general purpose instruments for applications in industrial, radio/television servicing, medical, amateur and advanced hobbyist markets.

Reorganization at Quasar In a move designed to separate the marketing and production functions of its subsidiary Quasar Electronics Com- pany, the parent Matsushita of Japan

Circle No. 102 on Reader Inquiry Card ETID - February 1979 / 1

RICHARD W. LAY Editor

WALTER H. SCHWARTZ Managing Editor

JOHN GOOLEY Contributing Editor

ALFRED A.MENEGUS Senior Publisher

DAVID J. HAGELIN Publisher

TOM GRENEY Publishing Director

JOHN PASZAK Graphic Design

KATHY TARNOWSKI Production Manager

LILLIE PEARSON Circulation Fulfillment

On the cover: Shown on this month's cover are the six

primary integrated circuits, plus the few remaining discreet transistors, which make up

Quasar's incredibly small "Dynamodule" chassis for 1979. For a more detailed

report on this circuitry see our special report in this issue.

CT/D FEATURES Quasar: 1979

ELECTRONIC TECHNICIAN/DEALER

LEADING THE CONSUMER AND

INDUSTRIAL SERVICE MARKETS

FEBRUARY 1979, VOL. 101, NO. 2

Television in a little black box 16

Solving vertical problems A look at 10 specific case histories 24

Curing Hi-Fi interference A pocketful of useful hints 98

Frequency multipliers Some theory and uses 31

DEPARTfnEATl: INDUSTRY REPORT 1

FROM THE EDITOR'S DESK 10

STRICTLY BUSINESS 12

NEWSLINE 6

CONTINUING EDUCATION REPORT 35

15

SERVICE SEMINAR 13

BULLETIN BOARD 36

TEST INSTRUMENT REPORT 38

DEALERS SHOWCASE 40

NEW PRODUCTS 42

CLASSIFIED ADS 46

ADVERTISING INDEX 48

READERS SERVICE 49

TEKFAX 51

LETTERS

HHJ A HARCOURT BRACE JOVANOVICH PUBLICATION 11.ABP

HARCOURT BRACE JOVANOVICH PUBLICATIONS. Robert L. Edgell, Chairman, Richard Moeller, President, Arland Hirman, Treasurer, Lars Fladmark, Senior Vice President, Joe Bilderbach, Vice President, James Gherna, Vice President, George Glenn, Vice President, Thomas Greney, Vice President, Ezra Pincus, Vice President, Harry Ramaley, Vice President, Lois Sanders, Vice President.

ELECTRONIC TECHNICIAN/DEALER (ISSN 0363-58211 is published monthly by Harcourt Brace Jovanovich Publications. Corpo- rate offices: 757 Third Avenue, New York, New York 10017. Advertising offices: 757 Third Avenue, New York, New York 10017 and 43 East Ohio Street, Chicago, Illinois 60611. Editorial offices: 43 East Ohio Street, Chicago, Illinois 60611. Accounting, Advertising Production and Circulation offices: 1 East First Street, Duluth, Minnesota 55802. Subscription rates: one year, $10, two years, $16, three years, $20, in the United States and Canada. All other countries: $45. Single copies: $1 in the United States and Canada; all other countries: $3. Controlled Circulation postage paid at Dansville, New York 14437. Copyright © 1979 by Harcourt Brace Jovanovich, Inc. All rights reserved. No part of this publication may be transmitted or reproduced in any form or by any means, electronic or mechanical, including photocopy, recording or any information storage and retrieval system, without permission in writing from the publisher. ELECTRONIC TECHNICIAN/DEALER is a registered trademark of Harcourt Brace Jovanovich, Inc.

2 / ET/D - February 1979

POSTMASTER: Send Form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth, MN 55806.

"General Electric is your most complete source for general line -and industrial '- electronic components:'

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ARKANSAS LITTLE ROCK, ARKANSAS 72204 4200-C Asher Avenue Tel. 501 / 661-0393

CALIFORNIA MODESTO, CALIF. 95351 123 Phoenix Avenue Tel. 209/521-805¶ NATIONAL CITY, CALIF. 92050 117 East 8th Street Tel. 714 / 477-8746

NORTH HOLLYWOOD, CALIF. 91601 10654 Magnolia Boulevard Tel. 213/ 769-2720

SAN MATEO, CALIF. 94402 600 South Amphlett Boulevard Tel. 415/348-3292

FLORIDA TAMPA, FLORIDA 33606 1505 Cypress Street Tel. 813/253-0324 FT. LAUDERDALE, FLORIDA 33309 3516 N.W. 10th Avenue Tel. 305/566-4882

GEORGIA ATLANTA, GEORGIA 30310 646 Evans Street S.W. Tel. 404/758-2232

ILLINOIS URBANA, ILLINOIS 61801 908 East Main Street Tel. 217/384-2052 SKOKIE, ILLINOIS 60076 5110 West Brown Street Tel. 312/675-0230

INDIANA INDIANAPOLIS, INDIANA 46204 112 West St. Clair Street Tel. 317/632-3493 SOUTH BEND, INDIANA 46619 2010 Western Avenue Tel. 219/288-8918

KENTUCKY LOUISVILLE, KENTUCKY 40217 #7 Dahlem Center, 826 Eastern Parkway Tel. 502/ 634-0498 LOUISIANA SHREVEPORT, LOUISIANA 71104 2423 Southern Avenue Tel. 318/221-3027 MASSACHUSETTS SPRINGFIELD, MASS. 01109 144 Boston Road Tel. 413/788-8206 MISSOURI ST. LOUIS. MISSOURI 63132 9577 Page Avenue Tel. 314/429-0633 NEVADA LAS VEGAS, NEVADA 89102 1114 South Casino Center Blvd Tel. 702/384-4235 NEW JERSEY TRENTON, NEW JERSEY 08638 1139 Pennsylvania Avenue Tel. 609 / 393-0999

JERSEY CITY, NEW JERSEY 07307 454 Central Avenue Tel. 201 / 792-3730

NEW YORK ROCHESTER, NEW YORK 14606 25 Howard Road Tel. 716 /647-911 80

NORTH CAROLINA GREENSBORO, N. CAROLINA 27405 2914 East Market Street Tel. 919/273-6276 OHIO CLEVELAND, OHIO 44109 4525 Pearl Road Tel. 216/741-2314 OREGON PORTLAND, OREGON 97210 1732 N.W. 25th Ave., P.O. Box 10141 Tel. 503/222-9059 PENNSYLVANIA PITTSBURGH, PENNSYLVANIA 15209 515 Grant Avenue Tel. 412/821-4004 TEXAS DALLAS, TEXAS 75218 11540 Garland Road Tel. 214 / 327-8413

CANADA ST. LAURENT, QUEBEC H4N-2L7 305 Decarie Boulevard Tel. 514/748-8803 CALGARY, ALBERTA T2H-1Y3 P.O. Box 5823, Station "A" Tel. 403/243-0971

If you want to branch out into the TV Tuner Repair Business write to the Bloomington Headquarters about a franchise.

Circle No. 134 on Reader Inquiry Card

4/ ET/D - February 1979

*T/D Richard W. Lay, Editor (Chicago)

Walter H. Schwartz, Managing Editor (Duluth)

Alfred A. Menegus, Senior Publisher (New York)

David Hagelin, Publisher (Chicago)

Tom Greney, Group Vice President (Chicago)

John Paszak, Graphic Design

Kathy Tarnowski, Production Manager

Debi Harmer, Prod. Supervisor

Lillie Pearson, Circulation Supervisor

Gene Bailey, Reader Service

Ed Schultheis, Promotion Director

Dawn Anderson, Classified Ad Mgr.

Please submit editorial manuscripts to: Editor, ET/D, 43 East Ohio St. Chicago, Ill., 60611

ADVERTISING SALES

Please send advertising material to: ET/D, Production Mgr. 1 East First Street Duluth, Minn. 55802 (218) 727-8511

East Region Alfred A. Menegus 757 Third Avenue New York, N.Y. 10017 (212) 888-4382

Midwest Region David J. Hagelin and Thomas P. Kavooras, Jr. 43 East Ohio Street Chicago, III. 60611 (312) 467-0670

Southern & Western Region Chuck Cummings 613 N. O'Connor Irving, TX 75061 (214) 253-8678

IIR.I¡

HARCOURT BRACE JOVANOVICH PUBLICATIONS

Robert L. Edgell, Chairman Richard Moeller, President Lars Fladmark, Senior Vice President Arland Hirman, Treasurer Joe Bilderbach, Vice President James T. Gherna, Vice President George A. Glenn, Vice President Thomas Greney, Vice President Ezra Pincus, Vice President Harry D. Ramaley, Vice President Lois Sanders, Vice President

has created two new operating divi- sions. They are the Quasar Company-with responsibilities for sales and marketing-and the Mat- sushita Industrial Company-which will handle consumer product engineering and production.

Still unclear as a result of the organ- izational change is the impact the move will have on Panasonic, Matsushita's other United States subsidiary, if, in fact, there is any impact on that unit. Quasar Electronics Company, based in Franklin Park, Ill., a Chicago surburb, is the former television business of Motorola, which Matsushita purchased in 1974. Under the new set up, Matsushita Indus- trial Company will be based in Franklin

Park and will operate the color TV plant there as well as a Panasonic speaker plant in Los Angeles.

The move is seen by some as an at- tempt to expand Quasar's U.S. production output, a strategy most Japanese television manufacturers have taken in recent months as a result of the chang- ing relationship between the Japanese yen and American dollar.

Named head of the new sales and marketing unit is Alex Stone, former Quasar sales and marketing vice president. Richard Kraft, formerly engineering vice president, becomes president and chief exec of Matsushita Industrial, according to spokesmen for the company. ETip

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Circle No. 120 on Reader Inquiry Card ET/D - February 1979 / 5

(1EWILIRE

WCES DRAWS RECORD CROWD. They literally came by the thousands to

Las Vegas last month to view the cornucopia of consumer electronics ...the Winter Consumer Electronics Show. And if there was any hint

of recession outside of the world's most gaudy city, it certainly did not register with the consumer electronics industry. First

figures from the show indicate business was brisk, coming off of a

record 1978 in many respects, and attendance of over 50,000 in four

days set a new WCES records.

VIDEO IS STAR OF SHOW. While audio remains the easy dominant fig-

ure out at WCES, there was no question that video is the up and

coming star. Over 400,000 VCRs were sold last year, at least

600,000 are conservative sales figures for this year. This goal

should be no problem with such an industry giant as RCA jumping in to spend $2 -million for VCR promotion in the first quarter. And if

that in itself is not worth an award, then surely RCA's theme is --

at least for originality. They're pitching that buying a VCR can

help keep peace among family members, especially kids who will no

longer mind going to bed early once assured by "mummy" that they'll be able to watch their favorite TV show when they arise in the

morning. Whew!

RECORD TV YEAR. There were more color televisions sold last year than ever before, and 1979 -- while not quite matching that figure

- won't be far behind. At least that was the consensus among "experts" out at the WCES last month. EIA figures showed final color TV statistics at 10.25 million. Black and white TV had its

second best year with a total 6.1 million units sold, EIA reported.

HOME COMPUTERS COME DOWN TO EARTH. One positive thing coming from the show this year is that the manufacturers of home computers at

last seem to have come down to earth. They no longer are touting the number of flip-flops inside their little black boxes, but rather what you can do with these flip-flops. With this important marketing shift to user related applications, the last great barrier toward a really successful industry has been removed.

EDS FEATURES INTERNATIONALISM. This year's Electronic Distribution Show (formerly NEWCOM) is expected to draw significant attendance from off-shore manufacturers and distributors. According to a show spokesman there already are a large number of U.S. companies whose products are manufactured off-shore signed up for the show. Additionally, a record attendance of off-shore distributors is expected. This year's show, incidentally, has been expanded into a

four -day event from May 1-4.


GOULD PROFESSIONAL OSCILLOSCOPES AT PRICES

YOU CAN AFFORD. Whatever your interest

in electronics, you know that a quality oscilloscope with a broad range of features and functions can make your work a lot easier. Gould oscilloscopes are built to solve your problems and priced so you can afford the professional equipment you need right now. All are complete, ready for use, including passive probes, input leads and a comprehensive maintenance and operation manual.

The 0S245A is a compact, dual trace instrument with a 10M Hz bandwidth and 5mV/div sensitivity. It has exceptional trigger performance and a full compliment of facilities for industrial, educational, and field service applications.

The 0S253 is a 12MHz dual -channel scope with all the features of the 0S245A plus a larger display area, more sensitivity and channel sum and difference.

The dual trace 0S255 weighs only 15 lbs. yet offers features normally found in more expensive instruments such as flexible triggering facilities and 2mV/cm sensitivity across its full 15MHz bandwidth.

OS255

The dual beam 0S260 gives true representation of two separate signals on the same time frame without beam chopping or alternating. Features include a high brightness CRT operating at 10kV


allowing a clear display of all waveforms.

For additional information on this exciting new line of sensibly priced, professional oscilloscopes or for sales locations in your area: call toll free (800) 325-6400 Ext. 77. In Missouri call (800) 342-6600.

Gould also manufac- tures an additional line of general purpose oscilloscopes for industrial, scientific and laboratory applications.

el GOULD ET/D - February 1979 7

Two of RCA's new XtendedLife Chassis have been awarded the highest serviceability ratings ever given to color television chassis.

When you service one,you'll know why.


Sooner or later, every television set requires service by a professional. So RCA designed two new XtendedLife Chassis to make servicing easier for any professional service technician. These new chassis are easily accessible and clearly marked.

To prove it, we invited NESDA/ISCET (the International Society of Certified Electronics Technicians) to send a team to inspect and evaluate our new CTC88AC and CTC93D chassis. And they gave them the highest serviceability ratings of any color television chassis they have ever tested.

RCA CTC88AC chassis 93.90% RCA CTC93D chassis 91.92% Two new RCA color chassis receive "excellent" ratings-highest in NESDA/ISCET history.

Here are a few of the reasons: The wire pattern is printed on both

sides of the circuit board, making it easy to trace out individual circuits.

Schematic symbols identify each component on the board.

All power supply source voltages and key pulse voltages are identified.

All key test points are marked on the chassis, with their functions on the Cabinet Layout Chart.

An Active Device Location Guide in the cabinet reduces the need for service books or diagrams.

The chassis slides back for better acces- sibility in normal field servicing.

These new chassis earned their high ratings from some of the toughest judges around-professional, independent service technicians. And when the testing was done, and scores were in, here's what the leader of the ISCET team had to say:

"The scores are important, and they are very good; but of greater importance is the result of RCA's efforts in making sets easier to service, which will earn the recommen- dation of thousands of technicians who will be working with these chassis for years to come: -Dean R. Mock, Chairman, NESDA/ISCET Serviceability Committee.

RC,' RCA is making television better and better.

Circle No. 129 on Reader Inquiry Card ETD - February 1979 / 9

room TIlE

EINTORT DESK

I've just returned from another Consumer Electronics Show, this one in Las

Vegas (Jan. 6-9), and as has been my experience each time I view one of

these events, I come out of it just a little more confused than when I went in. (A

full report on the Winter CES will be carried in next month's issue of ET/D).

To be sure, the show itself has to be the Mecca for electronics gadgetry and

household/auto playthings-to say nothing of its value as a centerstage to

unveil the sheer marvel of what can be done with and through electronics. However, without question, CES has become primarily a showcase

for stereo components. Each manufacturer, and the sheer number of them is

numbing to the senses, is there to display such large array of "systems" and

components-each dutifully backed by a list of technical specifications and

measurements-that I wonder if any consumer is ever really capable of

deciphering all of the technical jargon once it filters down to him at the retail

level. I get the feeling that the manufacturer with the best promotion and sales

pitch is the one that makes the most sales in the long run. But this is only the "home stereo" segment of the show. Moving along to "auto

sound"-as it is called-we witnessed the presentation of amplifier systems so

powerful it seems they would practically blow the roof off of an enclosed vehicle. Is there really a market for these products?

On the television side of things, the manufacturers were there in force to give

us glimpses of things to come in video. Matsushita, for instance, was host to a press reception to unveil in the United

States their "television set of the future"...a set complete with printer so the

listener can watch a newscast or presidential speech and then go over to the printer to rip off his printed copy of the text!!!

Of course we again saw the picture over a picture by Sharp wherein they

superimpose a small black and white picture over the large color picture (in the

bottom right hand corner). I've often wondered if it wouldn't be more practical-and perhaps less expensive-just to place a 9- or 12 -inch black and

white receiver next to your color set if you're interested in watching two

programs at once. But, ready for it or not, here it comes down the consumer electronics pipeline.

One television manufacturer even came to promote the superiority of its

sound system, having given up the fight to compete with picture quality and

esthetic frills. "Home computer" manufacturers were there too in greater numbers than ever

before. The only trouble is they have yet to figure out how to interest the

"average" consumer in their product-the latter seemingly totally confused by it.

Perhaps the most significant trend to emerge from the whole show was the

apparent steady growth of the VCR segment. Not yet by any stretch of the

imagination to be considered a boom market, yet definitely growing. Several new models were introduced along with new versions of color and black and

white television cameras. All in all, after considering the magnitude of the new frills added to consumer

lines, one left with the definite feeling of-if not confusion-then sincere doubt as to where the consumer electronics market is headed as manufacturers frantically search for new, greener, and lucrative markets to attack.

It seems to me in many cases that the technology of consumer electronics has far outstripped the needs of consumers.

Sincerely


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Everybody who is in the service business is in another

STRICTLY business at the same time ... we're in the money business. We all pretty much understand the service business. We

B uSIO SS have had training in it. We have had a lot of experience in

it. We have talked to a lot of other servicers about it. We know how to recognize a good technician, and we know how repairs should be made. We know how to route and

dispatch the men, how to buy parts and keep up the inventory and stock the trucks. We know about vehicles and test instruments.

But what do we know about handling money? Often, painfully little. Yet, regardless of how we handle the service end of things, if we do not handle the money

successfully, we will end up closing the doors. The objectives in the money game are threefold ... to

guard the assets ... to increase the assets ... and to make

money off them. On the service side of the business, we

have tools and instruments to help us. We learn how to

use them. They help us get the service job done. On the money side, we have tools to help us. We learn how to use them. They help us get the money job done. The tools we use on the money side are the Profit and Loss

Statement (it might be referred to as the P & L, or Operating Statement, or Income Statement) and the Balance Sheet. Every service manager or operator should have these tools in his hands every month.

Just as you don't have to know how to build a VTVM in

order to use it, neither do you have to know how to build a

P & L and a Balance Sheet. That's the accountant's job. All you have to know is how to use the tool when you get it.

So you don't have to be an accountant, but you do have

to be able to "take a reading." It's important. That's why, at the NARDA Service Symposium, we spend fully half of our time in learning how to take that reading. And at the NARDA College of Service Management, we spend one full day on financial statements.

You spend long, long hours every month working for money. Truly, though, the money should be working for you. Learn how to make money work for you. If you don't ... KAPUT.


SERVICE SEI1)I1RR RCA

Color TV Chassis CTC 44 -Severe horizontal foldover. Possible cause: Open L401 coil, (on PW400 horizontal deflection board).

ADMIRAL

Color TV Chassis 9M46-No raster, sound ok. Possible cause; open R414, 1K ohm, 1/4 watt, 5%, from pin 10 of IC 400 to point "AC."

IOA COLOR

KILLER 4411

411 100

IN' f5

L6Y'I C416Y

16

8407 2.202,256 7lY12 2 7MEG

/BY 16

8403 470

1.404 CH40NA

TAKE-OFF

1

TILT 0401 4400 4401, 54

ÿßj 470

C4451 1500T

T 4GB.Jr6 zi

R406

AMP.

10..4 L7P400 1.- i_0,611 L711

0402 7 A402í Ce03

220 8.21 f00 1/211_ AMP S

R404 -1AND Z+Yt_,.^,,,,__F DEMODULAiON °"5<`_' C414 tam 4415 yCa1s

IC 400 ,-E-'. S.4i. 47UF 0.33T -SOV T.047

3411,221 `r 7

- - 12405 C404 i =_ 1 T047 .041'r :' -

C470426

BY

10

41

56D17-1 Agi; CHROMA

Color TV Chassis 10M55-No vertical sweep. Possible cause: Defective horizontal processing-vertical countdown IC (IC600).

1111 11.11111111 13 1111

Color TV Chassis CTC 87-No video-color only on screen. Possible cause: open delay line, or open solder connection between delay line and PC board.

Color TV Chassis CTC 90-No video-sound ok. 210v pulse low, R438 open. Remedy: replace blue/white wire from pin 4 on MDL002, module to R428, defective insulation causes a short to adjacent terminal.

Color TV Chassis CTC81-Bending in raster, relay trips after about 1 minute of operation. Possible cause: Open "A" section in C206.

RCA Receiving Tubes Mean Business! You can gel all the receiving tubes you need from your RCA Distributor . . .

Miniatures, Novars, Compactrons, Nuvistors. Glass tubes, Metal tubes ... Over 1000 types, produced to RCA's exacting standards.

Plus many RCA service aids and business aids to add to your efficiency and

promote your business ... Tube Cad- dies, service tools, technical literature and a wide assortment of in-store signs and displays. See your RCA Distributor for all your tube needs. RCA Distributor and Special Products Division, Deptford, N.J. 08096.

RC" Receiving Tubes

ET/D - February 1979 / 13

1 Ì 1 nlrr,c L. =

2V D -D

RATE Cw2

CR 01

- TM,

SL27 *R204 C211,® 1000 .1 RED

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I +1C206 CR 3 3 SL29 4000äF I; C2p4T a G 2

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1kR32906 t 5W

- _y440VAq 6--1E1

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470 3W

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213 ÌÓÓ.3D 1000 L202

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J201 ORN/

- R210 R209 C2071 .1 150K 150K .1

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c v

HT

Color Color TV Chassis CTC81-Relay chatter, Xmas tree effect at high brightness level. 240v supply measures 225v, 38v supply measures 41v. Possible cause: open C206 filter capacitor. (See previous schematic.)

ZENITH

Color TV Chassis 20CC50-No HV, no boost, damper runs red after a few minutes. A clue: high voltage returns when

damper is removed. Cause: shorted C332 in damper plate circuit.ETD

V210 3DJ3, 3083 OR 3003

e3/0V 3 1",óó2

H.V. RECTIFIER ¶2 FROM PIN9

$8398 z v.

1 K' 4 ,.329J.

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OF CRT I I M.V

ADJ. R404 R405 3MEG 1.2MEG,5%

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RED

OR!

Perform a death -defying

act. Give Heart Fund. American Heart Associations

Original Japanese Replacement Parts for TV, Stereo and CB 25 -UP 1024 1.9 25 -UP 1024 19 25.UP 1024 1-9 25UP 10.24 19 25UP 1024 1.9 25-0P 10-24 19

255102 .29 .34 .39 255473 .45 .55 .60 255484 1.85 2.05 2.35 2SA495 .25 .30 .35 255497 .90 1.15 1.25 255509 .30 .35 .40 255562 .25 .30 .35 2055645 .29 .34 .39 255634 .35 .40 .45 255636 .80 .85 .90 255643 .30 .35 .40 255673 .30 .40 .45 255678 .40 .50 .55 255683 .40 .50 .55 255684 .40 .50 .55 255695 .40 .50 .55 2SA699A .50 .60 .65 255706 .85 .95 1.05 255720 .30 .35 AO 255733 .25 .27 .30 2SA747 4.15 4.35 4.85 25022 .45 .50 .55 25854 .30 .35 .40 25677 30 .40 .45 258175 .35 .40 .45 258186 .20 .27 .30 250187 .20 .27 .30 258324 .25 35 AO 258367 1.10 1.20 1.35 258405 .25 .30 .35 258407 70 .85 95 258463 1.00 1.05 1.15 258474 .70 .80 .90 208507 .70 .80 .90 258511 .70 75 .85 208557 2.05 2.45 2.75 2SC183 .40 .50 .55 2SC184 .40 .50 .55 2SC372 .20 .27 .30 2SC373 .20 27 .30 2SC330 .20 .27 .30 2SC382 .30 40 45 2SC387A .30 .40 .45 2SC394 25 30 .35 250458 20 27 .30

2SC460 .45 .50 .55 2SC481 1.25 1.35 1.45 2SC482 1.25 1.35 1.45 2SC485 1.25 1.35 1.45 250495 .45 .55 .60 2SC509 .30 .40 .45 25C517 2.90 3.10 3.25 2SC535 .30 .35 .40 2SC620 .45 .50 .55 25C632A .35 .40 .45 2SC634A .40 .45 .50 2SC697A 3.20 3.50 3.90 2SC710 .20 .27 .30 2SC711 .20 .27 .30 2SC712 .20 .27 .30 2SC717 .35 .40 .45 2SC730 2.95 3.15 3.35 2SC732 .20 .25 .30 2SC733 .20 .25 .30 2SC734 .20 .25 .30 2SC735 20 .25 .30 2SC756 145 1.75 1.95 2SC756A 2.00 2.10 2.20 2SC778 2.80 3.10 3.30 2SC781 1.95 2.15 245 2SC784 .30 .35 .40 2SC789 .75 .85 .95 2SC793 1.95 2.15 2.45 2SC799 1.95 2.15 2.45 25C828 .20 .27 .30 25C829 .20 .27 .30 2SC839 .30 .35 .40 25C8675 4.00 4.25 4.50 2SC900 .20 .27 .30 250930 20 .27 .30 2SC945 .20 27 .30 2SC1000BL .35 .40 .45 2SC1013 .45 .60 .65 2SC1014 .50 .60 .65 2SC1018 .70 .75 .85 2SC1030 1.80 2.05 2.35 2SC1056 4.50 4.70 4.90 2SC1060 .65 .75 .85 2SC1061 .70 .80 .90 2SC1096 .45 .50 .55

2SC1114 3.40 3.60 3.80 2SC1116A 3.20 3.45 3.80 2SC1124 .80 .85 .95 2SC1127 .80 .85 .95 2SC1162 .70 .75 .85 2SC1166 .25 .35 .40 2SC11728 3.10 .3.50 3.85 2SC1173 .50 .65 .70 2SC1177 10.90 12.40 13.80 2SC1209 .25 .35 .40 2SC1226 .50 .60 .70 2SC12265 .50 .60 .70 2SC1237 1.70 1.90 2.15 2SC1239 2.10 2.65 2.85 2SC1306 1.25 1.65 1.85 2SC1307 2.15 2.65 2.85 2SC1318 .30 .40 .45 2SC1364 .30 .40 .45 2SC1383 .30 .40 .45 2SC1384 .30 .40 .45 2SC1424 2.75 2.85 2.95 25C1448A 1.00 1.10 1.20 2SC1475 .65 .85 .95 2SC1509 .55 .60 .65 2SC1567A .60 .65 .75 2001675 .25 .30 .35 2SC1678 1.25 1.40 1.55 2SC1687 .40 .45 .50 2SC1727 1.20 1.25 1.30 2SC1728 .90 .95 1.00 2SC1760 .85 1.00 1.10 2SC1775 .30 .35 .40 2SC1816 145 1.70 1.95 2SC1908 .25 .35 40 2SC1909 2.00 2.55 2.75 2SC1945 440 4.90 5.50 2SC1957 .60 .70 .80 2SC1969 3.50 3.90 4.30 2SC1973 .60 .65 .70 2SC1974 1.25 1.65 1.85 2SC1975 125 1.65 1.85 2SC2009 .75 .80 .85 25C2021 .55 .60 .65 25C2028 .50 .60 .65 2SC2029 1.45 1.75 1.95

25C2072 3.55 3.75 3.95 2SC2076 .45 .60 .65 2SC2091 .85 1.05 1.15 2SC2092 1.75 1.95 2.20 2502098 3.00 3.20 3.45 25072 .50 .60 .65 25091 1.30 1.40 1.55 20092 1.40 1.55 1.75 250180 1.55 1.75 1.95 250187 .30 .40 .45 200218 2.95 3.20 3.45 2SD234 .60 .70 .80 250235 .60 .70 .80 250261 .30 .35 .40 250287 2.50 2.65 2.85 250291 2.05 2.45 2.75 250313 .60 .65 .70 200315 .60 .70 .80 2S0325 .60 .65 .75 250330 .69 .79 .89 250356 .70 .75 .80 250358 .70 .80 .90 250359 .75 .85 .95 2SD427 1.75 1.95 2.20 250525 .70 1.05 1.15 2S0526 .60 .70 .80 25619 .45 .50 .55 2SK23 .80 .95 1.05 25630 .40 .45 .50 2SK33 .60 .65 75 2SK34 .50 .55 .60 25641 .50 .55 .60 20655 .60 .65 .75 35622Y 1.60 1.70 1.80 35635 1.20 1.35 1.50 30637 1.70 2.00 2.30 35640 1.25 1.40 1.55 35641 1.25 1.40 1.55 35645 1.25 1.40 1.55 3SK48 3.30 340 3.70 3SK49 1.25 1.40 1.55 AN115 2.00 2.15 2.25 AN2140 1.55 1.65 1.85 AN228 4.10 4.30 4.50 AN239 4.10 4.30 4.80

AN247P 2.40 2.60 2.90 AN274 1.50 1.70 1.90 AN313 4.20 4.40 4.60 AN315 1.75 1.95 2.20 BA511A 1.70 1.9G 2.15 8A521 1.85 2.05 2.35 HA1151 1.45 1.70 1.85 HA1156 1.60 1.75 1.95 HA1306W 1.90 2.10 2.40 461322 2.40 2.60 2.90 HÁ1339 2.45 2.65 2.95 HA1339A 2.45 2.65 2.95 LA1222 2.10 2.30 2.50 LA3101 3.45 3.60 3.75 LA4031P 1.75 1.95 2.20 LA4032P 1.75 1.95 2.20 LA4220 2.25 2.40 2.55 LA4400 1.85 2.05 2.35 L03141 1.70 1.80 1.90 M5115P 4.85 4.90 4.95 M51513L 1.95 2.15 2.45 M143001 13.20 14.85 16.50 MN3002 9.25 10.40 11.55 MN3003 5.64 6.34 7.04 PLLO1A 4.00 4.15 4.55 PLLO2A 4.95 5.20 5.80 PL L035 7.50 7.90 8.70 S02645 7.00 7.40 7.80 SG609 4.10 4.30 4.50 SG613 5.20 5.40 5.95 SM5104 7.90 8.40 8.90 STK011 3.55 3.95 435 ST 6013 8.90 10.00 11.10 ST 6015 4.10 4.30 4.80 STK050 23.10 25.98 28.86 STK415 7.10 7.60 8.10 ST6435 4.45 4.95 5.55 ST6439 8.00 9.00 10.00 TA7045M 1.95 2.15 2.45 747055P 1.95 2.15 2.45 TA7060P .85 1.05 1.15 TA7061P .85 1.05 1.15 757062P 1.05 1.20 1.35 757063P 1.25 1.35 1.50 TA7074P 3.70 3.85 4.00

757089P 1.95 2.15 2.45 TA7092 9.50 10.00 10.50 TA7120P 1.45 1.65 1.85 TA7139P 1.55 1.75 1.95 TA7153P 5.70 5.90 6.10 TA7203P 2.45 2.60 2.85 TA7204P 1.95 2.10 2.45 TA7205P 1.55 1.75 1.95 TA7214P 3.90 4.20 4.50 TA7310P 1.25 1.40 1.55 TA7607P 5.80 6.00 6.20 TA7609P 4.40 4.60 4.80 TBA8105H 1.85 2.05 2.35 TC5080P 4.80 5.00 5.60 TC5081P 2.90 3.10 3.30 TC5082P 3.30 3.45 3.80 UHIC001 4.90 5.10 5.60 UH IC002 4.90 5.10 5.60 UH IC003 4.90 5.10 5.60 UH IC004 4.90 5.10 5.60 UHIC005 4.90 5.10 5.60 UH IC006 4.90 5.10 5.60 UPC20C 2.00 2.40 2.70 UPC141C 2.30 2.40 2.50 UPC157A 3.25 3.45 3.65 UPC554C 1.60 1.70 1.80 UPC555H 1.60 1.70 1.80 UPC572C 3.70 4.10 3.69 UPC574C .90 1.08 1.20 UPC575C2 1.25 1.40 1.55 UPC576 1.85 2.05 2.35 UPC592H2 .75 .85 .95 UPC1001H21.85 2.05 2.35 UPC1008C 4.85 5.15 5.75 UPC1020H 1.85 205 2.35 UPC1025 1.85 2.05 2.35 UPC1028 1.40 1.62 1.80 UPC1031H 2.52 2.74 2.98 UPC1032H 1.70 1.85 2.10 UPC1152H 2.90 3.10 3.30 UPC1156 1.85 2.05 2.35 UPD277C 8.70 8.90 9.10 UPD857C 7.90 8.30 9.40 UPD858C 7.00 7.10 7.20 0P0861C 8.70 8.90 9.10

PRICES MAY CHANGE WITHOUT NOTICE COD ORDERS WELCOMED

Minimum order $10.00 - N.J. Residents add 5% Sales Tax. We pay postage for prepaid orders of $50.00 or more,

Under $60.00, add $1.00, Canada $1.50. Quantity Discount Prices - Ask for our complete price list -

Manufacturer inquiries welcome - All parts guaranteed.

TOLL FREE TELEPHONE Nationwide 800/631-1250 Local 201/748-5089 NY:. 212/732-1376 , INTERNATIONAL

HOURS: Mon. - Fri. 8 to 5:30 Sat. 8 to 1

IMMEDIATE ON i ̀ - - . -

---_'

DELIVERY WITHIN 48 HOURS

ALL TRANSISTORS IN STOCK

NEW -TONE ELECTRONICS INTERNATIONAL P. O. Box 1738, Bloomfield, N. J. 07003

New Jersey Phone: 201/748-5089


LETTE RS Help Needed

I need a schematic and any technical info available on a Gran Prix CB, set Model UTR-1000. Inquiries to the company located in St. Louis, MO, have only resulted in negative responses because of time required to locate the info and current work load. I hope this lack of cooperation does not spread through the industry. Hilaire Rousseau 103 Spriggs Rd., #9 North Little Rock, AR 72118

Editor: We contacted Gran Prix Elec- tronics and were informed that they had sold no CBs for two years and could supply nothing for those they had sold previous to that time. This brings up an important point: While some merchan- disers may not care, conscientious sales organizations will make sure that the products they sell are backed by the availability of service data and parts and will continue to be for a reasonable time. The CB market, a couple of years ago, with its flood of distressed merchandise under almost any brand name imagin- able, was a particularly bad case.

Where can I purchase invoice forms as per your article on page 52 of the Oc- tober ETID Magazine? ("Pricing for Profit" by Dick Pavek.) I am especially interested in the Sperry -Tech forms. John J. Ehrhart 166 Tooker Ave. Springfield, NJ 07081

Editor: Tech Spray forms are available from Tech Spray distributors. If you cannot find one, write Tech Spray, Box 949, Amarillo, TX 79105. Sperry Tech forms are available from Sperry Tech, Inc., PO Box 5234, Lincoln, NE 68505. Oelrich makes a variety of forms available from distributors. New England Business forms are available from NEBS, Townsend, MA 01470.

Wanted -A 801 B&K Capacity Analyzer or Sprague Tel-Ohmike in good condition. Ralph Dorough, Instructor Radio & TV Repair South Garland High School 600 Colonel Dr. Garland, TX 75043

ET/D welcomes letters from readers and tries to answer all requests in this column or individually.

"We'd never lose a game if I had as sure-fire AIIK a system for

replacements u as Zenith's Instant

Parts Program!"

Notre Dame basketball coach,

'DIGGER" PHELPS

It's the easiest, least expensive Inventory control

system ever devised by Zenith for TV service technicians.

Organizes the most needed, most used TV replacement parts so they're where you want them when

you want them.

And ZIP (Zenith's Instant Parts Program) keeps these parts organized

thru periodic checks by your Zenith distributor salesman who

replaces slow -moving stock numbers with new, more popular parts.

As a result, your original investment is protected and your supply of Zenith

parts is always current. Call your Zenith distributor now

for all the details on the ZIP program that fits your needs!

For your own reputation and in your customers' best interest, always specify Zenith

exact replacement parts and accessories.

The quality goes it before the name goes on®

Zenith Radio Corporation/Service, Parts & Accessories Division 11000 Seymour Avenue/Franklin Park, Illinois 60131

Circle No. 137 on Reader Inquiry Card ETID - February 1979 / 15

The Quasar "Dynamodule" Chassis It's new for 1979

This new, highly integrated receiver from Quasar, featuring six completely redesigned ICs as the active signal processing strips, brings it to the forefront of state-of-the-art television.*

By Richard W. Lay

Quasar's "works in a drawer" concept has turned into Quasar's "works on a

wafer" with the introduction of its compact, highly integrated, state-of-the-art 1979 chassis line.

A single board, berefit of any resemblance to anyone's television receiver of just a few years ago, the newest of Quasar's offerings is a basic "main board" module some 30 percent smaller than the "Super Module" of previous years and as refined in last year's TS -961/962 chassis. About 90 percent of the functional active circuitry has been "vaporized" into the darkest recesses of those little black boxes commonly referred to as ICs.

The trouble is though, they're all

soldered in, which is going to provide some discomfort in IC removal. However, modules are replaceable Quasar says.

But, asides being asides, don't bother looking for a video detector. The fact is,

it's inside the video processor IC. And don't try to isolate problems in the first IF

amp from the second, because they're all "inside." The plain fact is, you can't even tell-from looking at the schematic-how many stages of IF

amplication this receiver contains. *All illustrations courtesy Quasar Elec- tronics Company.

.r . . s

M s « .. - II+ % '.'

Quite frankly, looking over the schematic of the VTS-967 chassis using this new module-called "Dynamodule" by Quasar's marketing department- there are only nine transistors in

all (seven in the TS -968 chassis). This has got be some kind of record for a solid state TV receiver with VIR as of this point in time.

Except for the chroma outputs, the horizontal output and driver, the power supply, flesh control and vertical blanking transistors, every significant active circuit has been placed inside of an IC ... all newly designed by Quasar's parent-Matshushita.

For a basic rundown of what's going on at Quasar for 1979 here's a capsule look:

-You'll find "Dynamodules" inside of Quasar chassis 965 (19 -inch), 967 (19 -inch), and 968 (25 -inch) receivers.

The basic difference between the 965 and 967 is the CRT-the 965 using bi -potential, 90 -degree, in -lines, and the 967 a tri -potential, 100 -degree deflection, in -line. The 968 contains the tri -potential, 100 -degree deflection, in -line CRT used in earlier chassis.

-Prefixes to the basic chassis numbers mean the following: LTS, AFT button only; TS, Dynacolor; ETS or EVTS, Dynacolor plus audio spectrum sound; AGTS, remote control with Dynacolor and varactor tuned 18 detent VHF/UHF/tuner; and GTS, featuring Dynacolor, varactor tuners, and 18

detent VHF/UHF manual tuning. (For a

description of Dynacolor and Audio Spectrum Sound see ET/D, Feb., 1977, P. 20.)

-The basic design differences between the three Dynamodule chassis are; the TS -965 is not available with VIR;


with the TS -967, some models carry VIR.

Here are some basic design features you'll find in the three new Dynamodule chassis. The 965, no VIR, has a line operated power supply rectified by a

single power rectifier. The 967 is available with a separate VIR circuit board and uses a tri -potential CRT-as mentioned earlier. It is line operated with a bridge power supply rectifier. The 968 is available with audio spectrum sound, tri -potential CRT, VIR, and carries a ferro -resonant power supply with AC line isolation.

The basic Dynamodule is

complemented by another circuit board which carries the power supply/high voltage/pincushion circuitry (see block diagram, Figure 1). A third board will be found on other models equipped to handle VIR signals and all of the VIR signal processing is handled on it. Set operation is not affected by removal of the VIR board for repair, however, jumpers must be added so that color intensity and hue controls are returned to manual operation during this period.

The Dynamodule also derives its secondary voltages from rectified pulses from the flyback, therefore the loss of any of these secondary sources quickly isolates a problem to the circuit or circuits supplied by a particular source.

Loss of horizontal sweep pulse results in complete shutdown of the set.

New ICs The main feature of the Dynamodule-and the reason for the reduction in the number of discrete components-is the complete redesign of integrated circuits on board.

Starting with IC101 (see Figure 2), here's a rundown of what's inside those ICs. IC101 carries the IF amplifiers, video detector, the video amplifiers, the sound IF detector, the AGC and AFT sections. The tuner IF signal is coupled to pins 1 and 28, the video portion being channeled to Pin 7 where it leaves the IC to pass through a 41.25 Mhz sound trap, and then reentering at Pin 9, the input to the video detector.

An inner tap sends the composite video signal to the Sound IF detector, where it is capacitively coupled, and amplified before leaving the IC at Pin 21

for coupling to the Sound IF IC (IC201) through a tunable interstage transformer, T202.

After detection, the video signal is

amplified and sent "outside" once more through a 4.5Mhz trap before feeding a

buffer amplifier at Pin 18 of the IC. The output of this buffer feeds IC301, the

A

0

AFT SWITCH

¡¡9 VIN

VOL CONTROL > OVADO

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HF/UH,

TUNERS

RAPS lb

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PROCESS

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INPUTS

SEP

IC 501 AFC TIME CONSTANT -

9 5 MHz SOUND

DL

VIDEO 'UB T CONTRAST

PANEL CHROMA

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HORIZ cl

B

PULSE t al

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ERT L PU.

IC901 "N PULSE AMP VERT OUTj

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3 58 MHz

CW BIC ( J

58

AUD

IC601 LESH CORR 358MHz OSC

AIC

AFPC HÓRI2 PULSE

VERT. PUL

VERT SWEEP

0301 VERT BLANK

CONI I

COLOR IN TENSITY

HIC CONTROL -

Fig. 1 TS -967 Block diagram

SPEAKER

PICTURE CONTROL ri0353

D _ I,

OUT 0501 HORZ

DRIVER

12r.RE8.

25

0 802 )129.

REGULATOF

H551 ORIZ

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SYNC FROM IC 501

NOTE:

'INDICATES CIRCUITS DELETED ON NON VIN MODELS.

TO

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REGULATED POWER SUPPLY

29

PIN CUSH ON

CIRCUIT

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ASSEMBLY

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>TV TO CRT >12KV TO G5.65 CRT

FOCUS TO CRT

11 V CRT 5190 STIR FIL. TO

TSSAT CRT BOARD

J IFOCUS BLOCK L_

LADEO FROM IC IVI

12 V

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Fig. 2 VIF/SIF Circuit

4575 MHZ 000 Y -o I TUNING

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R301 L302

2V

R303

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chroma processor. This source, Pin 19, also feecs the sync separators and noise inverter stages, and in VIR models, the VIR board.

AGC and AFT functions are also internally handled. In the case of AGC, the internal circuitry develops and feeds reverse AGC voltage to Pin 5 and forward AGC to Pin 4 to meet the requirements of different tuners. It is adjustable by a separate voltage divider

network on the Dynamodule. AFT correction voltage is fed to Pin 10

of the IC and it adds to or subtracts from 6.5VDC reference voltage which is fed to both the VHF and UHF tuners.

Sound signal processor IC201 (Fig. 3) is the sound processor and inside it is the 4.5MHz sound amplifier, the FM quadrature detector, the volume and tone control stages and


the audio amplifiers. In addition there is

an internal 25 -volt shunt regulator in this unit.

As mentioned earlier, the composite video from Pin 21 of IC101 is coupled through T202 to Pins 2 and 3 of the sound processor. There it enters IF

amplifiers and is limited before feeding the FM detector and an "outside" quadrature coil. The output of the detector feeds another "outside" de -emphasis network and then reenters the IC for processing through the tone

control before being fed to the audio amplifier section of the IC which in turn feeds the speaker.

The 25 -volt "inboard" regulator is

shunted across the audio amplifier section in order to assure a constant current load for the 25 -volt source voltage.

ICs 501 and 401 The sync, vertical sweep, and horizontal sweep circuits of the Dynamodule are carried out within

Fig. 3 Sound IC

T203 QUAD COIL

N201 VOLUME CONTROL

11 J

T2

V

CH

:® ©1®

TAO 0!ïO O

C212

.25V

.12 V

C2

R203 TONE CONTROL

301 x@

AND A23-3 VIR CIRCUIT

.12 V

TP3I

VELO HOLD 8402

Fig. 4 Sync and vertical sweep circuit

EPT SIZE R403

O SERVICE SWITCH

VERTICAL YOKE

SWEEP BOARD

A HORZ PULSE FROM FBT

TO V21

VIR BOARD VTR VIR DEFEAT( o

OFF0 ON AFT SWITCH

AFT SWITCH FOR VTR OPERATION. ON

OOELS ONLY

NOTE

0506 HORZ HOLD

CUT FOR v TR OPERATION IN

ON- VIA MODELS JUMPER IS OPEN ON VIR MODELS

0501 HORZ DRIVER -

129 V

HORZ. PULSE FROM FBT

0551 HORZ OUT

HEAT SINK

Fig. 5 Horizontal sweep circuit

various sections of two ICs, 501 and 401. The video buffer (Pin 19) of IC101 feeds the noise inverter and sync separator stages (vertical/horizontal) of IC501 through capacitors 306 and 307. The noise inverter internally cancels noise pulses that exceed the proper sync amplitude. One of the outputs from the sync separator is sent on to IC301

(color processor) and the VIR circuitry in

appropriate models. Vertical pulse generation is

accomplished inside the IC through a

vertical sync separator, a vertical oscillator, shaper and pre -driver (see Fig. 4). The vertical waveform leaves IC501 at Pin 17 for direct coupling to the vertical driver and vertical output stages of IC401. This signal is

coupled via cables to the yoke and power supply sweep board.

Horizontal The horizontal sweep function is also located in IC501 (see Fig. 5). This section contains the horizontal sync separator, the pulse shaper, a horizontal AFC circuit, the horizontal oscillator and horizontal pre-driver-plus overvoltage shutdown protection. Essentially, the section receives the horizontal pulse from the flyback, shapes it into a

sawtooth voltage via C501 (outside the IC) and sends it on to the horizontal AFC. The AFC section compares this signal with the horizontal signal from the sync separators and makes any necessary adjustment to control the oscillator.

A pulse waveform from the oscillator is fed to the horizontal pre -driver which shapes it into a square wave and this is

direct coupled to Q501, the horizontal driver. This collector signal is fed to T501 which drives Q551, the horizontal output.

On VIR models, a section of the AFT switch is used to change the AFC time constant for VTR operation and at the same time to defeat the VIR circuit.

The overvoltage shutdown circuit inside the IC compares rectified DC from the flyback transformer with ABL voltage. Voltage/current levels outside of pre -determined specifications automatically shut off the horizontal pre -driver causing system shutdown.

Vertical blanking Vertical retrace blanking is

accomplished through different methods in the Dynamodule, depending on whether the model is equipped with VIR or not.

In the VIR model, positive pulses are fed from a vertical pulse amplifier in

181 ET/D - February 1979

IC401 to the VIR board and to a special vertical blanking transistor (Q301) which in turn blanks the CRT driver transistors during vertical retrace and allows the VIR signal to be fed to the VIR board.

Non-VIR models eliminate Q301 and its associated circuitry. Blanking occurs in the matrix stage of IC301 in non-VIR models.

1C301 Although IC301 is called the chroma processor, it also contains a video amplifier. Other functions of this IC are: chroma amplification, ACC, color killer, hue and color intensity control, and demodulation matrixing. Other color circuit functions are located on IC601.

The composite video signal from IC101 is connected to the customer adjustable video peaking control on IC301 through the delay line and C301. After amplification it is fed to the video clamp which clamps it at the black level.

The Y signal from the output of the clamp is then matrixed in IC301 with the demodulated color difference signals.

With "Dynacolor" on, a light dependent resistor is switched into the circuit and controls the DC voltage on the customer's personal touch control to maintain proper ratios of brightness, contrast, and color intensity.

Chroma The chroma section of 10301 receives the composite video from 10101 through bandpass transformer T601 and C603 at Pin 13, the input to the ACC and chroma amplifier stages of the IC (see Figure 6). After amplification the signal is

fed to IC601 (chroma amp, oscillator and flesh control IC) and, through discrete capacitor C612 to the demodulator matrix of IC301. Here the color difference signals are mixed with the Y signal and the color video signal is DC coupled to the red, blue, and green driver transistors on the CRT socket board. Color killer and hue control circuits also are located within IC301. IC601 contains the 3.58Mhz oscillator, APC detector, and flesh control circuitry (Figure 7).

The function of the flesh control is to change yellow/green or purple flesh tones encountered when switching from station to station. Phase correction of these signals is accomplished with minimum effect on the three primary colors and is limited to plus or minus 20 degrees phase change of the original 3.58Mhz CW.

Automatic color intensity control is

also accomplished in IC601 through an Automatic Intensity control detector.

Fig. 6 Chroma Circuit

VIR I.C. 651

R616 SUB IR61

RAC FROM T601 0ET IC. 101 >"--) 0 C601 1 C603 DOTE

MANUAL INTENSITY CONTROL

R607

.--4

0603 t WIRE JUMPER

ANON VIR MODELS

GRIN CONTROL

COLOR KILLER

DETECTOR

V10E

DEM00 Y0R1i

R

B

IC. 301

T3 HORZ.

PULSE

I TP42

I E -.--j l

0610 6612 v TO I.C, 601

12 V

DY NACOLOR SWITCH

AIC VOLTAGE FROM IC 601

CRT BOARD

0353

0352

0351

CRT

.F,16

ON DYNACOLOV

SWITCH

NC NON-VIR MODELS

065

VIR BOARD

L603

OLOR INTEND,*+ CONTROL CIRCUIT

ï/

- GAIN GOMM

---VIR MODELS ONLY

0610 TP43 C612:zlz TP42

HUE CONTROL CIRCUIT

HORZ PULSE

LC. 301

C611 LODI

^ HORZ SYNC PULSE FROM IC 5010

Fig. 7 Flesh control and 3.58Mhz oscillator circuits

MANUAL COLOR CONTROL

COMPOSITE SYNC

HORZ. PULSE

COMPOSITE VIDEO

e----10301

COLO CONTRO

R

MATRIX G

B

BLACK LEVEL CLAMP

PULSE PULSE

GEN 19th. LINE PULSE SWITCH-ItG

ELECTRONIC SWITCH

COLOR IB-Y COMP. I+'

V I R PULSE

VERT -OETECTOR-_ PULSE

{ FLESH ..._9651

CONTROL BLANKING

TO IC 601

Fig. 8 Block diagram of Quasar's VIR circuit

LED O

R G B

AMPS

CRT

-+ Y

TRIX R B

- B -Y R -Y

-MATRIX

Y

/ Y AMP

f f HUE

1

COMP. R_y

ELECTRONIC SWITCH

MANUAL HUE CONTROL


MODEL 467 ONLY $298

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Eventually every customer's picture tube will grow weak or fail completely. By using a B&K-PRECISION 467 Restorer/Analyzer you can greatly increase your profits while performing a "feat of magic" in the eyes of your customer... and every customer is another reason why you should have a 467.

The 467 Restorer/Analyzer is ideal for the

Start earning extra profits today! See your local distributor for immediate delivery.

active service shop where time is most valuable. Its exclusive patented TriDynamic'" test method lets you and your customer see the performance of each gun on its own meter, simultaneously. Computer - derived digital circuitry tests all three guns of a color picture tube, in programmed sequence, twenty -times per second.

Also from B&K-PRECISION, the 470 is a value leader and designed to be a profitable investment-even for part-time technicians. The price is only $198. Resto- ration is fast and safe, because automatic restoration timing prevents costly cathode stripping. The 470 uses the same powerful restoration method as the 467.

467 EXCLUSIVE FEATURES: B&K-PRECISION TriDynamic'" multiplex

technique to test all three guns of color CRT simultaneously, under actual operating conditions Measures beam current that actually passes through G1 aperture to screen Unique computer -derived digital circuitry for accurate results Tests focus electrodes lead continuity to catch faults that other testers miss 467/470 FEATURES:

Uses the most powerful restoration method known for best results with minimal danger to CRT Removes shorts and leakage to save more CRT's All CRT's checked identically-including "in -line" and "one -gun" types for accurate results Obsolescence proof: perpetual set-up

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DYNASCAN CORPORATION

6460 West Cortland Street, Chicago, Illirois 60635 312 / 889-9087 In Canada: Atlas Electronics, Ontario International Sales: Empire Exporters. 270 Newtown Rd., Plainview, L.I. N.Y.11803

Circle No. 138 on Reader Inquiry Card 20 / ET/D - February 1979

This circuit serves to maintain relatively constant color levels, scene to scene and channel to channel. A DC output is

applied to the chroma gain control stage of IC 301 and automatic intensity control is achieved independent of the color burst amplitude.

The VIR signal A separate circuit module used in

selected 967 and the 968 Quasar chassis, carries the VIR circuitry. It is

connected to the main board by three plug on cables and contains a 24 -pin, dual, in -line IC, a flesh control blanking transistor, plus associated components. The VIR board requires horizontal, vertical, video, R -Y and B -Y signal inputs (Figure 8).

The VIR signal (for vertical interval reference) has been used for the past three years by some broadcasters. It is

carried on the 19th line of both composite video fields and consists of chroma, luminance and black reference signals, the horizontal sync pulse, and the color burst (see Fig. 9).

Its purpose is to establish identical phase and amplitude relationships inside the television receiver as were broadcast at the transmitter. Thus while phase and amplitude relationships of the VIR signal may vary from broadcast station to broadcast station, the VIR signal recaptured inside the receiver will theoretically be a true reproduction of

I lit

BURST

,....-CHROMA REFERENCE

LUMINANCE REFERENCE 1 _.

-19TH LINE

BLACK REFERENCE

L1t_

SYNC PULSE

Fig. 9 The VIR signal

the VIR signal broadcast by the station to which the receiver is tuned. Thus, through the use of the VIR system, the proper relationships between the color, "Y" and back level will be maintained.

Circuit operation A pulse generator on the VIR board produces signals which key on the VIR and the color and hue detectors during the 19th line of each field (during vertical retrace). Simultaneous clamp pulses clamp the black level of the Y, R -Y and B -Y signais in the Y amplifier, color comparator, hue comparator and the VIR detector.

The VIR detector detects the presence or absence of a VIR signal in

the broadcast signal. If present, the detector output activates the auto/manual switches for VIR automatic color and hue control functions and lights a VIR signal LED.

A Y signal matrix is used on the VIR board to combine R, G, B signals to form the Y signal. The output is amplified and clamped to the black level and a minus Y

signal is fed to the B-Y/R-Y matrix. Similarly, R and B video signals are

combined in the B-Y/R-Y matrix to form color difference signals which drive the color and hue comparators. B -Y from the matrix is coupled to the color comparator, clamped and stored in a

capacitor for one field. The difference between the voltage stored in the capacitor and the clamped pedestal voltage of the VIR B -Y signal is used for error correction at the output of the comparator. This voltage is coupled to the color gain control stage and adds to or detracts as necessary.

The function of the hue control portion of the system is analogous to the operation of the color comparator except that it uses the R -Y signal which is used to control the hue control stage. As continued on page 45

Fig. 10 Partial schematic of the TS965 power supply

FROM FLYBACK TRANS

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1.5A +123V

TO HORIZ

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ETID - February 1979 / 21

The last time you saw a reallynew bench/portable DMM was 1972.

That's the year our 8000A was introduced. Its custom LSI and solid owner benefits quickly established it as the world's leading DMM.

Now, look at the new 8010A and 8012A: single -chip CMOS de- signs for problem -solving in the eighties!

RAZOR- SHARP LCD for large, no -strain answers at first glance- in any light.

TOUCH AND HOLD probe option, so you can thread your way through a component jungle and capture the reading you need.

FUNCTION POWER: 22 ranges of AC and DC volts and current, six ranges of resistance, and three ranges of conductance - the mis- sing function on other bench multi - meters.

CONDUCTANCE RANGES for noise -free leakage measurements to 10,000 Me. A valuable function for bench -testing boards and components, conductance also measures transistor beta (using a bias resistor) and light intensity (by using a photocell).

OVERLOAD -PROTECTED - like no other DMM, including rejection of 6000V transients and up to 600V applied to the current terminals.

HONEST AC ANSWERS derived from a Fluke hybrid true rms converter. You'll even see the difference on your AC line between the correct value and what your average -responding meter reads. And 50 kHz bandwidth won't let any significant distortion products go unmeasured. Plus, 10 times the basic response you may be limited to now!

SPECS YOU EXPECT from Fluke - like ±0.1% on DC for one year. Both models available with rechargeable batteries, and backed by the same solid warranty and worldwide service that helped make the 8000A the industry standard.

LEADERSHIP HAS TO BE EARNED. And we're committed to keeping the price of your confidence as realistic as possible. Like $239 for the 8010A with a 10A current range, and $299 for the 8012A with two extra -low ohms ranges that allow measurements from 0.0010 to 10,000 Mil - making it the widest range ohmmeter available!

Contact one of the more than 100 Fluke offices and representatives, worldwide, or CALL (800) 426-0361` TOLL FREE. In the U.S., and all countries outside Europe, write: John Fluke Mfg. Co., Inc., P.O. Box 43210, Mountlake Terrace, WA 98043, U.S.A.

In Europe, contact Fluke (Nederland) B.V., P.O. Box 5053, Tilburg, The Nether- lands. Telephone: (013) 673973. Telex: 52237.

Prices U.S. only. ' Alaska, Hawaii, Washington residents - please call 12061 774-2481.

FLUKE

22 / ETID - February 1979

2502-8010

AUTHORIZED FLUKE DISTRIBUTORS For immediate stock availability of these and other precision Fluke instruments and accessories, please contact the Fluke distributor in the following cities. For the location of Fluke offices and representatives in other areas, please CALL (800) 426-0361 TOLL FREE (Alaska, Hawaii, Washington residents -call (206) 774-2481).

ARIZONA Phoenix Liberty Electronics (602) 249-2232 Metermaster (602)243-4111 Scottsdale Barnhill Assoc., Inc. (602) 947-7841

CALIFORNIA El Segundo Liberty Electronics (213) 322-8100 Los Angeles Metermaster (213) 685-4340 Mt. View Elmar Electronics (415) 961-3611 Napa Avionics Assoc., Inc. (707) 252-2121 Palo Alto Metermaster (415) 968-0313 San Diego Liberty Electronics (714) 565-9171 Metermaster (714) 560-4841 Sun Valley Leasametric (213) 768-4200 COLORADO Commerce City Elmar Electronics (303) 287-9611 Denver Barnhill Assoc., Inc. (303) 750-1222

CONNECTICUT Middleton The Mancib Company (203) 346-6646 FLORIDA Orlando Brownell Electro, Inc. (305) 843-6770 GEORGIA Atlanta Brownell Electro, Inc. (404) 762-5181

HAWAII Honolulu EMC Corporation (808) 847-1138

ILLINOIS Chicago Joseph Electronics (312) 297-4200 Elk Grove Village Metermaster (312) 593-8650 Joliet Avionics Assoc., Inc. (815) 729-0820

INDIANA Indianapolis P. A. D.I. (317) 849-3682 KANSAS Wichita Radio Supply Co., Inc. (316) 267-5216

MARYLAND Gaithersburg Pioneer/Instrumentation (301) 424-3300 MASSACHUSETTS Billerica Metermaster (617) 667-8346 Burlington The Mancib Company (617) 272-9450 Framingham Calcotron (617) 879-7650

MISSOURI St. Louis Olive Electronics (314) 426-4500 NEBRASKA Lincoln Scott Electronic Supply Co. (402) 466-8221 Omaha Scott Electronic Supply Co. (402) 734-6750

NEW JERSEY Midland Park Leasametrics (201) 444-0662 Totowa Ampower (201) 790-6750 NEW MEXICO Albuquerque Barnhill Assoc., Inc. (505) 299-7658 NEW YORK Corning Corning Electronics (607) 962-0555 Farmingdale Am power (516) 752-1078 Long Island Harvey Electronics (516) 921-8700 New York City Advance Electronics (212) 687-2224 Thornwood Electronic Tool Company (914) 769-8070 Vestal Harvey Electronics (607) 748-8211

NORTH CAROLINA Charlotte Brownell Electro, Inc. (704) 394-4341 Dixie Electronics (704) 377-5413

OHIO Cleveland Pioneer/Instrumentation (216) 587-3600 Dayton N.I.D.I. (513) 434-7500

OREGON Eugene United Radio & Supply, Inc. (503) 342-3381 Medford United Radio & Supply, Inc. (503) 779-7933 Portland Liberty Electronics (503) 292-9234 United Radio & Supply, Inc. (503) 233-5341

PENNSYLVANIA Philadelphia Sunshine Scientific (215) 673-5600 Pittsburgh Pioneer/Instrumentation (412) 782-2300 Plymouth Meeting Techni Tool (215) 825-4990 Spring House Avionics Assoc., Inc. (215) 643-6555 SOUTH CAROLINA Columbia Dixie Electronics (803) 779-5332 Greenville Dixie Electronics (803) 229-4554 TEXAS Austin Barnhill Ill (512) 451-0217 REDCO (214) 653-1041 Dallas Barnhill Ill (214) 231-9012 Houston Barnhill Ill (713) 688-9971

UTAH Salt Lake City Barnhill Assoc., Inc. (801) 484-4496 VIRGINIA Chesapeake I.T. R. (804) 424-5121 Richmond I.T.R. (804) 275-1431

WASHINGTON Bellevue Applied Engineering (206) 455-4922 Liberty Electronics (206) 453-8300 Seattle Western Electronics (206) 284-0200 WISCONSIN Green Bay Northern Radio & TV Corp. (414) 435-8331

CANADA ALBERTA Calgary ACA Electronics Centre Allan Crawford Assoc., Ltd. (403) 276-9658 Edmonton Cardinal Industrial Electronics, Ltd. (403) 455-4122 BRITISH COLUMBIA Vancouver ACA Electronics Centre Allan Crawford Assoc., Ltd. (604) 294-1326 Vernon Interior Electronics, Ltd. (604) 545-2394 MANITOBA Winnipeg W.E.S. Ltd. (204) 632-1260

NOVA SCOTIA Dartmouth Allan Crawford Assoc., Ltd. (902) 469-7865 ONTARIO Toronto ACA Electronics Centre Allan Crawford Assoc., Ltd. (416) 678-1500 Ottawa Allan Crawford Assoc., Ltd. (416) 678-1500 Ottawa Allan Crawford Assoc., Ltd. (613) 829-9651

QUEBEC Montreal ACA Electronics Centre Allan Crawford Assoc., Ltd. (514) 670-1212

...Circle No. 113 for Information ...Circle No. 114 for Demonstration


Ten vertical case histories Things aren't always what they seem to be.

Here are some hints for handling problems resulting in a lack of vertical sweep. Ten case histories prove they can originate both within and outside of the vertical section.

By Homer Davidson

Eighty-five percent of troubles found in

the color and b&w TV chassis are caused by vertical and horizontal circuits. Vertical sweep symptoms may be a horizontal white line, not enough height, excessive foldover, a picture that keeps running or intermittent vertical sweep. One horizontal white line indicates no vertical sweep and may be

caused by almost any component in the vertical circuits (Fig. 1). When the screen cannot be completely filled out, check the final vertical output stage for improper vertical sweep. Also, vertical foldover conditions may be caused by the output circuits. The problem of a

vertical rolling picture that cannot be locked in is usually found in the sync or vertical oscillator and input circuits. Intermittent vertical problems are usually caused by a tube or transistor, defective capacitor, tube socket or pc

board connection.

No vertical sweep When an RCA CTC40 chassis came in

for repairs only a horizontal white line could be seen on the picture tube. Since the chassis was completely solid-state, a voltage check was made on the vertical output transistor (Q101-3564). The vertical collector voltage almost equalled the supply voltage indicating the transistor to be open. A check with a

transistor checker confirmed this.

Fig. 1-A photo of a solid-state chassis with all the vertical transistors soldered in except the vertical output transistor.

Although vertical sweep was restored when the transistor was replaced, the vertical hold control would not stop the picture from running. Voltage measurements at the vertical switch transistor (3560) turned up improper voltage and indicated a leaky transistor or corresponding components. The vertical switch transistor had a high leakage and was replaced with an SK

3122. When possible, it's best to replace defective transistors with original components, but in most vertical problems, universal transistors do an excellent job of replacement.

Compressed vertical Only ten inches of the screen was filled out in this GE 19QA chassis. Replacing the vertical input module is one way to see if the trouble is in the input or output circuits. But in our case, the vertical

module wasn't available, so the module had to be repaired.

Improper voltage was found at the vertical transistor and a voltage source measurement revealed the actual vertical problem (Fig. 2). In this chassis, a portion of the vertical voltage source is

taken from a tapped winding of the flyback transformer. A positive (10.9v) and a

negative (29.6v) voltage source feed the vertical circuits and these components are found on the vertical module.

The 10.9 voltage source was normal, but there was no negative voltage. A

silicon diode in the negative voltage winding was shorted. It's best to remove one end of each diode to check for leaky or open conditions. When vertical problems are found in this chassis, if

any one of the diodes runs warm after replacement, check further into the vertical circuits for possible leaky


470pí

Part of flybkack transformer

10.9V

2

f

t00mfd

0012

shorted -29 6V

3 it

1100

2

rotd

470pf T

Fig. 2-The power source is at fault in a GE-19Qa chassis.

J102 yoke socket

4

f I f I T403 s

R420

L402

R415 270ohm

500ohm C406

15W

39mfd

pin amp adtust open lead

Fig. 3 -Only one inch of vertical sweep in an RCA CTC728 solid-state chassis.

components. Also, check for an open 10 ohm resistor in the positive voltage source (10.9v).

Normal voltage-no sweep In an RCA CTC 72B chassis, only one inch of vertical sweep was noted, although voltages were near normal at all vertical transistors. Remember that vertical problems may be caused by components in other related circuits, such as pin -cushion, yokes and convergence assemblies.

With this particular chassis an open lead on L402 was located in the pin -amp circuits (Fig. 3). Soldering the coil connection solved the poor vertical sweep condition. Another cause could be an open vertical yoke winding. Also, in some chassis check for insufficient vertical sweep caused by a defective electrolytic bypass capacitor on the vertical convergence board.

Intermittent sweep An intermittent RCA CTC49XA chassis was brought into the shop with a vertical problem. Sometimes the vertical sweep was only two inches high and other times normal. Most of these conditions are caused by tubes, transistors, poor tube and transistor sockets, defective feedback capacitors and poor board connections.

With this chassis, the vertical output

0101

623 +77V

22V

0102

22V 624

to VC

Fig. 4-Intermittent vertical sweep in a RCA CTC49 chassis.

0082mfd

01 Vertical

multi

250V

10K changed

to 12K

4-

burned

reduced to

15K

Vertical

output

6J06

+85V

Fig. 5 -No vertical lock in a Coronado model TV2-6617A.

transistors were those thin, flat types and these transistors are noted for internal intermittent conditions (Fig. 4). Sometimes, by using an insulated tool, you may move one of the transistor terminals and cause the sweep to collapse. In other circuits, you may end up replacing both transistors. When pushing around on Q101's terminals (623) the vertical sweep became intermittent. After removing the suspected transistor it was tested in a beta transistor tester and we found it

opened when moving the emitter element. Sometimes, these transistors will open up when sprayed with a coolant. With the power output transistor out of the circuit, check CR104 for open or leaky conditions.

No vertical lock When the picture keeps rolling and cannot be locked in, suspect components in the vertical feedback and hold control circuits. If the picture is running both vertically and horizontally, suspect problems in the sync circuits common to both outputs. The picture would roll constantly in a Coronado model TV2-6617A (Fig. 5).

In many cases voltage measurements may not locate a rolling condition component. With this chassis, a

transistor was used as the vertical multivibrator and a tube as vertical

output. The transistor was tested in the circuit and the beta reading was normal with a high leakage reading. Of course, this leakage reading may be caused by the isolation diode found in the collector circuit. We assume if the transistor was not open and proper vertical sweep was noted, the transistor must be good.

A further check of the components revealed a 100K feedback resistor from the plate of the vertical output tube (6JQ6) appeared warm and overheated. Removing the resistor from the circuit we found the resistance was only 15K. Checking the circuit further, a 10K resistor from the same circuit had increased to 12K ohms. Replacing the feedback capacitor (.0082), 6JQ6 tube, and both resistors restored the set to proper operation.

Half -way up After an Airline model GEN -12448A was on for a half hour, the picture would pull up about halfway from the bottom (Fig. 6). Adjusting the vertical height and linearity controls helped but the picture was three inches from the bottom of the screen. Replacing the vertical tube (13GF7) gave some improvement, but did not cure it all the way.

This vertical circuit is quite common with a lot of color TV chassis, although you may find another tube with a

different filament voltage in other


circuits. A voltage change on the plate (pin 8)

of the vertical oscillator tube section may cause insufficient vertical sweep. Check the plate load resistor R521 (2.7 meg) and the vertical size control (5 meg) for an increase in resistance. Insufficient boost or voltage or a change in

resistance of the boost voltage dropping

resistor may produce a pulled -up picture. These voltages can be monitored when the set is first turned on, recorded and taken again after the picture has pulled way up from the bottom of the screen.

Poor boost A narrow vertical sweep condition in a

136F7A C515 R527

01

R516 C512

220K 1/

fro m^ I / sync

circuit

leaky capacitor, pull up at bottom

82K

C521 T 680p

003

R123 1 Meg

Vert

Nold.

R519

270K

R520

1K

C514

R526 C517 z 136F7A

01

C516 R525

100K

82K

T 680p

\. / R521

2.7K

cause pullup

from bottom

leaky cause foldover

R523

^M 1K

C159

10m1

T152

vertical output

C>

+ 4- C520 B +360V

-2 .

50mfd

leaky or dried up. cause foldover and V to convergence pull up at bottom assembly

Fig. 6-The picture was pulled half -way up in an Airline GEN -12448A model.

HV rectifier 3AT2

T701

flyback .1mfdT

1

R724

'10K

1 mfd

burned

720V

boost

Fig. 7 -Poor boost voltage caused poor vertical sweep in a Midland model 15-239.

6LU8 Vertical output

15v

40V

47mfd

T decreased to

30 ohms

to vertical

transformer

215V

increased to

800 ohms

22K

RI 560 ohm 265V

1 watt

R2

IK,' to horizontal

output tube

Fig. 8 -Excessive vertical foldover was found in a Sylvania D09 chassis.

0068

6FM7

vertical output transformer

Midland model 15-239 was caused by improper boost voltage. In some TV chassis you may find the vertical oscillator plate voltage produced in the boost circuit of the fly -back circuitry. The high boost voltage is fed through the vertical size control and plate load resistor of the vertical oscillator stage.

In Fig. 7, R724 was burned and had increased to 1 megohm. Generally, these resistors are of the one or two watt variety and should be replaced with the original value. You can spot them by looking for a burned white greyish appearance. Improper plate voltage at

the vertical oscillator tube may indicate improper boost voltage.

Foldover Generally, vertical foldover is caused by defective components in the output stage of a tube or transistor chassis. In a

Sylvania D09 chassis, replacement of a

6LU8 vertical tube did not solve all of the foldover conditions (Fig. 8). Both cathode resistors were burned with R1

560 ohms increased to 825 ohms and R2 (1K) reduced to only 30 ohms.

The vertical foldover problem was licked after replacing the defective cathode resistors and tube. Other foldover problems may be caused by a

leaky coupling capacitor between oscillator and output tube. Check the vertical output tube cathode resistor and electrolytic bypass capacitor for bottom vertical foldover. In transistorized vertical circuits check the vertical output and driver transistors for vertical foldover problems.

Bouncing In a Zenith chassis 14N22 the picture would begin to bounce and then roll (Fig. 9). The picture would not lock in and two white horizontal lines were seen at the tip of the raster. Adjustment of the height and linearity controls did not help. All voltages found upon the 6FM7 tube

Fig. 9 -Excessive bouncing in a Zenith 14N22 chassis was caused Fig. 10 -Wire around the defective socket with wire loops in a RCA with an increase in resistance of PC2. color -track chassis.


were near normal. The vertical feedback component

(PC2) was checked for leakage and correct resistance. The resistance had increased to 2 megohms. Eigher replace the PC2 component with a Zenith part number 87-7 or simply connect a 220K 1/2 watt resistor across terminals 1 and 2. Also, a vertical output transformer with shorted turns will produce a bouncing raster.

Intermittent An RCA color track portable, model FX475W came in with an intermittent vertical sweep problem. Sometimes the chassis would operate for months and at other times it would collapse to a few inches, three or four times a day. Of course, this type of intermittent problem may not act up when placed on the service bench. But, with the back cover removed, the raster began to collapse on the third day. The intermittent condition would only show up for a few seconds.

With a VTVM connected to the vertical output transistor and left in that position until the set acted up, the culprit finally was located. An output transistor power pin was loose in the transistor socket causing the contact to arc and make a poor contact. Since then several of these chasses have come in with the same problem, replacement of the transistor socket was necessary, or you could wire a shunt wire to the element terminal and socket pin (Fig. 10).

Final hints First, isolate the vertical symptoms from other sections of the TV chassis. Don't forget to look outside the vertical section for faults producing possible vertical problems. In tube chassis replace the vertical tube even if it tests good and then troubleshoot.

Always replace the vertical module in

a transistorized chassis and then check the output section for possible trouble. Remember a defective module may destroy the vertical output transistors. Remove the vertical output transistors from the circuit for normal leakage tests. Don't forget to apply silicone grease when installing a new vertical power output transistor. ETD

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CuringHì-Fì Interference A growing problem

With the number of reported cases of RFI skyrocketing, here are some practical installation guides and troubleshooting tips that can save you time and money.

By Joseph J. Carr, CET

By now we are all familiar with many new forms of pollution that were all but unknown to our grandparents. But one form of pollution that the electronic servicercan (profitably) help eliminate is

electro -magnetic interference (EMI), also sometimes called radio frequency interference (RFI). This problem is

defined as the interference to other electronic devices or apparatus by a radio or television transmitter.

With an estimated 20 million transmitters on the air in CB alone, the

situation can only grow worse in the future. The FCC estimates that the number of interference complaints will rise approximately 230 per cent from 45,200 in 1976 to 105,000 this year.

The FCC has claimed that in 46 per cent of the cases where a CB transmitter was at fault, the operator was using an

illegal linear amplifier to increase the power level, and that the interference ceased as soon as the illegal amplifier was disconnected. But in many, perhaps most, cases, interference to Hi-Fi

equipment due to problems in the audio equipment, or even if the fault of the transmitter, can be eliminated at the "audio end." In this article we will consider Hi-Fi interference.

Many electronic servicers have traditionally shunned handling EMI

problems because they can be time consuming, and there is no guarantee of

success. But with the proliferation of transmitters, not just CB's, we can no

/

/ VOLUME CONTROL

/

\

LONG SPEAKER

TURNTABLE

AM -FM TUNER

FEEDBACK j---

CABLES

REEL-TO-REEL CONTROL POWER

TAPE RECORDER AMPLIFIER AMPLIFIER

OTHER

CASSETTE STAGES

TAPE RECORDER SPEAKER

OC POWER

MISCELLANEOUS SUPPLY

AUDIO SOURCE

AC POWER MAINS

Fig. 1 Block diagram of an audio system showing points of entry for RF signals

longer ignore the problem and maintain a claim to being professional servicers. Fortunately, much of the myth surrounding Hi-Fi interference problems is overstated.

Audio rectification Discounting intererence that comes through the RF stages of the tuner, which is actually more related to TVI

than "Hi -Fi -1," most interference to audio equipment is from a phenomenon called audio rectification, i.e. the detection of the RF signal by active components (such as tubes, transistors, ICs, etc.), by diodes, or by poor solder connections acting as impromptu diodes.

The symptoms produced by audio rectification vary with the type of transmitter causing the interference. AM transmitters, for example, will cause the operator's voice or (in broadcast band cases) program material to be

surperimposed over the normal signal. In many cases the interfering signal is

much louder than the normal material, while in others it is in the background.

A SSB transmitter, on the other hand,

will sound garbled and extremely distorted. The customer will probably not

even be sure that it is really a voice at all. FM and TV audio carriers will cause a

decrease in volume and, possibly, distortion of the normal signal. The FM

carrier will tend to quiet the audio amplifier, but its modulation is not

detected. FM carriers may also produce a "frying eggs" sound, and possibly clicks as a two-way transmitter is keyed on and off.

TV video carriers are a form of AM, i.e.

vestigial sideband, and are wideband pulses. The type of sound they make when interfering in audio systems, then, is a "ripsaw" buzz that changes as the picture scene also changes.

Where the interference is due to a

broadcasting station's transmitter being close by, diagnosis is simple because the signal is continuous. Besides, the station's towers will often be visible at the customer's location!

But where a CB station, ham radio operator, or commercial two-way FM

transmitter is involved, then you may have to be present while the station is

transmitting before it is possible to diagnose the problem. Of course, where an AM transmitter is involved (mostly CB) you are pretty sure of the problem


Fig. 2A RF choke wound on ferrite rod using speaker leads

when the customer complains of hearing a specific neighbor's voice, or has been clever enough to write down the station's call -sign!

Customer relations Unless you are also a two-way radio servicer it is unlikely that you will be involved too closely with the transmitter. You will probably be called in by the audio equipment owner. The local FCC field offices, and sometimes local (volunteer) TVI committees, often refer the audio equipment owner to local service shops once it is determined that the transmitter is being legally operated "in accordance with good engineering practice."

But the Hi-Fi owner is not likely to perceive this as anything but a "raw deal" that will cost money. The view is usually something to the effect "why should I have to pay when it is somebody else's equipment that is interfering with my equipment?" This customer has a valid question, and it is prudent to give a truthful, but tactfully worded, reply ... pressing the following points: 1. Any electronic device must not only respond to desired signals, but must also reject unwanted signals. 2. The transmitter is not doing something wrong to the audio equipment, but the audio equipment is improperly responding to the transmitter's signal. 3. The radio station owner is as much entitled to operate as the customer is to use the audio system. In fact, the transmitter is sanctioned by the FCC, while the audio equipment is not.

How RF enters the system Fig. 1 shows the block diagram of a home audio system (or at least one channel of the system!) RF signals can go into the audio system through the loudspeaker leads, ac power leads, and the low-level audio leads coming from outboard auxilliary equipment (i.e.

Fig. 2B RF choke wound on toroid ferrite core using speaker leads

phonos, tape units, tuners, etc.). If RF gets into the speaker leads it can

travel around the negative feedback loop to the input stage, or at least an early stage, of the power amplifier. The signal may then be rectified by the input stage, and treated as any other ordinary audio signal by the PA stage.

Similarly, it can enter via the ac power cord, and be coupled to the power amplifier either through the dc power supply (especially if the electrolytic filters have deteriorated!) or by capacitive coupling via radiation from power lines to signal wires.

If the RF signal gets on the audio input lines, then it can be detected at the amplifier input stage, and have the entire system gain ahead of the demodulated signal! This problem is especially severe on high impedance inputs used in most home audio equipment, and is less severe on 500-600 ohm inputs typically used on commercial audio equipment.

Troubleshooting Before we are able to take effective and appropriate action to cure audio rectification, we must locate the RF entrance point. If the loudness of the interfering signal is not affected by the set's volume control, then the problem is most likely the speaker leads. But if the loudness is affected by the volume control, then look tothe audio inputs as the source. In neither case will this be absolute, but it serves to point the way to a probable cause.

If the speaker leads seem to be at fault, then disconnect them and try listening for the interference using headphones (with short leads!!). If the problem disappears when the headphones are used, then it is even more likely that the speakers are at fault.

Determining which piece of outboard audio equipment is at fault is done through a process of elimination. Disconnect the sources one -by -one (at the amplifier end of the audio cable) until the interference ceases.

Fig. 2C Toroidal rf choke using hook-up wire

Unfortunately, solutions sometimes come only through a process of trial and error. But there are some "fixes" that work more often than others. You will sometimes find that none of them are effective by themselves, but are effective in combination with one or more of the others.

Installation checklist Speaker Lead Entry: 1. Install a disc ceramic capacitor (i.e. 0.001-0.01 µF) across the speaker terminals on the back of the amplifier. Place the capacitor as close to the chassis as possible.

2. Install an RF choke in series with the speaker lead, as close to the amplifier chassis as possible. Do not use a regular RF choke, as these cause too much phase shift even in the audio range. Fig. 2 shows several suitable chokes that you can make. In Fig. 2A we see the speaker leads wrapped around a 100 mm (4 in) ferrite rod. The rod could possibly be salvaged from an old portable radio, or be purchased. The rod shown is the model MU -125 sold by Amidon Associates (12033 Otsego Street, No. Hollywood, CA 91607). Alternatively, a ferrite toroid (also by Amidon) can be used in the same manner (Fig. 2B). An RF choke for use inside of the amplifier can be fashioned using hook-up wire wrapped around a somewhat smaller toroid, (Fig. 2C).

3. Replace the speaker leads with two -conductor shielded wire. Use the internal conductors to carry the audio signal, and ground the outer shield to the amplifier chassis, close to speaker terminals. Do not ground the shield at any other point, or use the shield to carry audio! Speaker leads should be as short as possible, but should not be any integral multiple of a quarter wavelength (i.e. 9 feet x N on 27 mHz CB).

4. Install a good RF ground between the amplifier chassis and actual earth ground. CAUTION: On ac/dc, or any other hot -chassis equipment, use a 0.001-0.01 uF, 1000 WVdc disc ceramic

ETID - February 1979 129

capacitor in series with the ground lead (see Fig. 3).

Note well that a decent dc ground need not also be a good RF ground! Use short lengths of heavy braid as the ground wire.

Power Line Entry: 1. Install an RF line filter (Fig. 4) in the ac line. This filter must be located as close to the point the ac cord enters the chassis as possible.

The filter in Fig. 4A is usually sufficient, but in more stubborn cases the version in Fig. 4B may be required. L1 and L2 should have a value between 100 µH and 50 µH, with the lower values being used at higher, i.e. VHF, frequencies. The RF choke must be able to carry the full ac power mains current drawn by the equipment, and be well enough insulated from ground to withstand any voltage likely to appear on the ac line (i.e. upwards of 600 volts, or so, in -transient. Several companies manufacture these RF filters already assembled in a shielded case.

2. Ground the chassis, but see the cautionary note given above.

3. Make the ac power cord as short as possible.

4. Install a three -wire power cord in

which one wire (i.e. the green wire) is

TRANSFORMER ISOLATED AC -DC OR HOT CHASSIS CHASSIS MODEL

NONPLASTIC COLD WATER PIPE

Fig. 3 Proper RF grounding for chassis of amplifier

grounded to the chassis (see cautionary note above).

Audio Input Entry: 1. Make sure that all cable shields are intact, and that the connectors at both ends of the cable are tight fitting.

2. Ground all pieces of equipment in

the system together (see Fig. 5 for right and wrong ways to ground equipment). See the cautionary note above.

3. Install small value RF choke (i.e. 100 µH) in series with the signal cable (right at the input, preferably inside of the amplifier chassis).

4. Install a small value capacitor (i.e. 50-100 pF) across the audio signal cable (preferably at the connector, just inside of the audio amplifier chassis).

5. Some servicers have reported that slipping 4 or 5 ferrite beads over the input leads, inside of the amplifier chassis, reduces the RF level.

Shielding Some high quality audio equipment is

not properly shielded against RF. This is particularly true of console models in the

AC

POWER MAINS

Cl 001uF T 1KV

1

o

C2

001uF T 1KV

L2 50mH

'ó00b` Cl 001uF

1KV

o

C2 001uF

1KV

o aQQQI o

L2 50mH

Fig. 4 RF filter for ac power lines

WRONG 711

TUNER

0 0

.. ;. TAPE RECORDER

AMPLIFIER

0000

RECORD PLAYER

this "loop" may act like an antenna at some frequency

RIGHT

TAPE RECORDER

EARTH GROUND

AMPLIFIER

TUNER

RECORD

PLAYER

Fig. 5 Right and wrong ways to ground outboard peripheral equipment.

mid -price range, but is known even in

high-priced component systems. If lack of shielding appears to be a

source of the problem (suspect it if none of the remedies given above seem to affect the problem, especially if there is

obviously no shielding present), then try to determine whether shielding could be added. Note, however, that such mechanical alterations are time-consuming, so determine whether or not the customer will pay for it

beforehand. Proper shielding materials include

sheet aluminum, metal shield boxes (i.e. Bud, LMB, etc), brass or copper foil, and metallic (not plastic!) window screen material. These materials are available variously at "home handy man center," and the type of hobby shop that deals a lot with arts & crafts. Which to use in any particular case will depend upon the nature of the set, and how much shielding is necessary. In some cases, for example, it is possible to use only some foil or screening glued or tacked inside of the audio equipment cabinet, while in other cases major (and expensive!) machine work is needed.

Make the job easier Audio rectification problems may be as intermittent as the two-way radio operator's transmissions. It might help to secure the operator's cooperation, so that transmissions are guaranteed when you need them.

Beware, though, of demanding assistance, or sounding accusatory (or allowing the customer to be so) when asking for assistance. If you put the operator on the defensive, then any cooperation will be hard to obtain. Emphasize that the operator's cooperation will not cost anything, and will probably eliminate the audio interference to the mutual benefit of all concerned parties.

Your job may be made easier by ordering, and offering to the customer and the operator, copies of a U.S. Government pamphlet titled "How to Identify and Resolve Radio-TV Interference Problems" (order from Consumer Information Center, Dept. 051F, Pueblo, CO 81009, @ $1.50 each. Stock No. 004-000-00345-4). This FCC pamphlet is directed to all parties concerned: set owner, transmitter operator/owner, and servicer. Many government pamphlets are next to useless, but this one is different. It has the flavor of having been written by people who have been nailed to the wall solving the problems addressed on more than a few occasions. ETD


In this article you'll learn why more than just defective components can affect the output of these sensitive circuits. For a better understanding, read on.

By Bernard B. Daien

Frequency multipliers have been used wherever it is required that the final output frequency be higher than the oscillator frequency. Thus, a crystal oscillator, used for stability, may control a transmitter with an output frequency hundreds of times higher.

Unfortunately, most literature merely supplies a definition of a frequency multiplier, and little else. When the multiplier output drops off, the technician is left to his own devices in determining the factors that affect the multiplier operation.

This article explains the basics of frequency multipliers from the practical point of view, in order to aid the technician who actually works with multipliers, and needs some answers to the questions that inevitably arise.

Harmonics A frequency multiplier must be a nonlinear amplifier. A linear (Class A) amplifier reproduces the input signal faithfully, which means no distortion ... which means no harmonics. Harmonics are signals in the output which were not in the input, and are called "harmonic distortion" in audio amplifiers. It is obvious that the bill will be filled admirably by using the good old Class C amplifier, which works over less than half of the input cycle.

Frequency multipliers revisited Conduction angle is a key

The output waveshape of a Class C radio frequency amplifier is shown in Figure 1, and is obviously a very non -sinusoidal waveshape. Remember, a sine wave is the only waveshape which consists of a single (fundamental) frequency. As we depart from the sine waveshape, increasing distortion is accompanied by more, and larger amplitude, harmonics. The waveshape in Figure 1 is therefore very rich in harmonics ... BUT ... why do we have a non -sinusoidal waveshape to begin with? To answer this we must go back to the definition of the Class C amplifier ...

"A Class C amplifier is biased so that under the available drive (input), the output conduction angle is less than 180 degrees." The key word is "biased."

If you think about it, the input signal must be biasing the base of the Class C amplifier on for less than 180 degrees ...

which means that the input waveshape seen by the Class C amplifier is also distorted, and full of harmonics! So harmonics are generated at both the input, and the output of the frequency multiplier.

As a matter of fact, Figure 1, which is the collector conduction angle could be retitled, "base conduction angle" ... because the collector conducts only when the base conducts. If the base has no input current, neither does the collector.

Fig 1 Note: The collector conduction angle is shown by the shaded area.

If the base input conduction angle is changed, so is the harmonic content of the output, since the input wave shape helps to determine the number, and amplitude, of the various harmonics present in the output. Specifically, a change in the drive level can drastically affect the output of the multiplier. You see ... we already applying our theory to practice!

Bias plays key role But the base drive level, or any fixed biasing, has an even more significant effect, as shown in Figure 2. Examine Figure 2A ... note carefully that since the output frequency is twice the input frequency, a conduction angle of 180 degrees in the output is the result of a 90 degree conduction angle at the input ...

a fact which immediately is apparent after you think about it!

But a 180 degree conduction angle is Class B operation, and although we get maximum harmonic output at this conduction angle, the efficiency is lower than it would be with Class C operation. At this point we must recall that efficiency is the ratio of input power to output power, so what we are saying is that we have increased the dissipation in the multiplier ... and with power amplifiers we are always trading off efficiency versus power output. Low efficiency means heating, short component life, more current drain, etc. As a result, we seldom operate our multipliers at Class B ... and we are going to look at this a little more closely because it has some important effects.

Well, let's restate this a little differently, to get things into perspective. If the multiplier is to operate Class C, it must run at least 180 degrees conduction ... or, to put it another way ... never more than 180 degrees. But if the


o////////n..

Output current conduction (at 2f)

Input current condution at frequency

Fig 2A Note: Shaded areas show current conduction

output of a frequency doubler is to be 180 degrees or less, the input conduction angle must be 90 degrees or less, as we have previously mentioned. Now what would the conduction angle at the input have to be

in a frequency tripler if the output is to

be 180 degrees or less? Using the same logic ... there are three output cycles for each input cycle ... thus if we have 180 degrees output conduction, we must have 60 degrees or less angle of input conduction.

Critical factors By now you see the light ... the higher the

r

Output current conduction at 2f

Input !current conduction .at frequency

Fig 28 note: Shaded areas show current conduction

output harmonic desired, the less the input conduction angle. And, since the input conduction angle depends upon the fixed basis, the grid leak bias, and

the amplitude of the drive, you are

starting to get the picture of what factors

can result in low output from a frequency multiplier without actually having a

component failure. Just let the drive drop off a bit, due to low efficiency of the driver, or drift in a tuned circuit due to

temperature or vibration, or component changes ... and your tripler may want to

be a doubler! But things can get even worse ... look

at figure 2B, which is the same as Figure

2A, except the input conduction angle has been increased to more than 90

degrees ... now just look at what has happened to the output conduction! The areas marked "X" represent the points which should be the most negative going parts of the output cycle. Instead, they are being driven into conduction ...

positive conduction ... by the fact that the input conduction angle is so long that it is

"spilling over" into what should be the negative areas. Let's see what this does ... with the help of a mechanical analogy.

The frequency multiplier is much like a

child on a swing. If you give the swing a

little shove, just as it starts its downward

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Fig 3 Schematic diagram of a common 'doubler" circuit.

swing, everything goes along smoothly. As a matter of fact, you don't have to shove the swing every oscillation, instead you can shove it every second time (doubler), third time (tripler), etc. BUT ... you must shove it on the downswing. If your timing is wrong, and you hit it on the upswing, the swing stops. That is exactly what happens when the input conduction angle gets too large, the output is trying to swing

negative while the current conduction is trying to swing it positive, and the output falls off rapidly.

The tuned tank circuit in the output provides the "flywheel effect" which simulates the swing, and the transistor collector provides the "shove." The shove has to be of the right time and duration (conduction angle).

More factors We all know that feedback can lead to problems ... positive feedback results in oscillation. What conditions are required to make a tuned grid, tuned plate oscillator? The input must be tuned to a lower frequency than the output, there must be power gain, and feedback. We already have two conditions present in the multiplier, gain, and input tuned lower than the output ... therefore it is quite possible to have problems with feedback. Even if the circuit doesn't oscillate, it may be regenerative, and that can be a very touchy problem with unregulated power sources.

But that's the minor half of the feedback problem. What if there is negative feedback (degeneration)? You know that negative feedback reduces harmonic distortion ... and harmonic distortion is exactly what we want in a

frequency multiplier. So, degeneration often reduces the harmonic output. What produces degeneration? Just one example ... any impedance in the emitter lead of the transistor produces severe degeneration. (The same principle as an unbypassed resistor in the emitter circuit in an audio amplifer). As a matter of fact, there are many ways to produce degeneration at high frequencies, and any of them are murder in a frequency multiplier ... so be careful of lead dress and part placement in making repairs. Again, use exact replacement parts, as internal leads are not visible ... neither are capacitances. It is extremely mysterious to have a multiplier circuit, in which everything seems normal, yet output is way down. A very little degeneration is all it takes. Remember, according to classic feedback theory, if we had a gain of ten, with only 2% negative feedback, the gain would drop to about 3! If the original gain were 20, the reduced gain would only be 4.

Effects of "Q" Loading has a strong effect on the output. The tank circuit must have a reasonable "Q" in order to achieve the selectivity necessary to discriminate effectively between the harmonics,

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ET/D - February 1979 133

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suppressing the unwanted ones to avoid spurious frequencies. Unfortunately, a

loaded tuned circuit has a low "Q" and cannot achieve this objective. On the other hand, if the multiplier is not loaded, there is little power gain. Again, we have a trade off, which is more critical than the usual broad band straight through amplifier. Thus tuneup is more critical, and manufacturers alignment procedure must be followed extra carefully. Attempts to get "more drive" in an effort to hop -up transmitters by "tweaking" the tuning usually results in getting more harmonics but less of the desired one.

Figure 3 shows a very efficient doubler circuit, known as a "push -push" doubler. The inputs are driven in push pull, while the outputs are in parallel. This circuit operates much the same as

the conventional full wave rectifier which delivers 120 cycle ripple from a 60 cycle line, each transistor alternately contributing a pulse to the output. The difference is that there is power gain in this circuit. Since only one transistor operates at a time because the inputs are out of phase, the transistor that is turned off acts like a neutralizing capacitor for the other transistor, and the circuit behaves like a well neutralized amplifier if matched transistors are

used. This is a good circuit, and has been around for a long time.

Harmonic generators Another technique that has been employed successfully is to generate a

stable signal at some relatively low frequency, then clip it with a good high frequency diode, into a square wave. Since a square wave has a large number of odd harmonics, a tuned amplifier is

used to select the desired one, followed by the necessary power amplification. This has been used mainly in low power applications, such as receivers and

signal generators, and is a little puzzling the first time encountered, since the circuit diagram doesn's seem to make sense with a diode labeled "harmonic generator" or some similar title.

Other ingenious schemes have been used for frequency multiplication from time to time. A saturated core inductor produces a distorted wave shape full of harmonics, and has been used at low frequencies where frequency multiplication poses some very special problems. Varactors have also been used, since the ability to change capacitance very rapidly provides the basis for low noise amplifiers and continued on page 45

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The consumer electronics technician who is still trying to ignore digital electronics technology has a limited time left in the industry. With digital techniques becoming more and more common-on some sort of exponential curve-it is apparent that without a good working knowledge of digital electronics he already has problems and shortly will find

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Heath -kit Digital Techniques Program EE -3201

It's almost painless

By Walter H. Schwartz

large areas of consumer electronics a mystery, let alone understand and repair his own test equipment.

Digital control of TV tuners, microprocessor control of tape decks, digital processing of sync and sweep signals in TV sets, microprocessors in appliance control, digital schemes for superimpos- ing one picture on another on the television screen are here and much more is coming.

Unfortunately not all of us are in a position to conveniently return to the classroom for training in the basics of digital electronics. So we must look for alternatives; books, or home study programs. One such alternative is Heath's "Digital Techniques" individual learning program, one of Heath's Continuing Ed- ucation Series.

The program consists of two volumes divided into ten sections covering the various aspects of digital electronics. It

includes records (or optional at extra cost, cassettes) to be played before beginning each of the ten units. It also includes eighteen IC's, a seven segment LED display and assorted miscellaneous components with which to perform a total of twenty-four experiments with the

Heath Kit Trainer Digital Design Experi- menter, ET -3200, Kit form, or ETW - 3200, assembled. The trainer includes a breadboard socket, power supplies, + and - 12 volts, and +5 volts, a clock generator, logic and data switches, and LED logic indicators. It or its equivalent is very important as the experiments are essential elements of the program. While the trainer is a separate cost item it is versatile enough for general use in breadboarding both analog and digital circuits for other purposes.

According to the course objectives, after finishing the kit, one should be able to; discuss the advantages and benefits of using digital techniques and name their major applications in electronics; convert between binary and decimal number systems and recognize the most commonly used binary codes; understand how the various components operate in digital circuits such as logic gates; discuss the characteristics and operation of the more commonly used integrated circuit logic families; use Boo- lean Algebra to express logic operations and minimize logic circuits in design; understand flip-flops and the operation and application of binary and BCD counters, shift registers and other sequential logic circuits; understand and design combinational and sequential logic circuits for a given application from definition and concept to the selection of the integrated circuits; discuss digital counters in time and frequency measurements, digital computer organiza- tion and operation and discuss microprocessors, operation and application.

The program begins with a discussion of the advantages of digital techniques, the binary number system and semiconductors as applied to digital electronics. It covers basic logic circuits in discrete component form and in various integrated circuit versions. The program discusses Boolean Algebra, the special language of digital logic circuits, its laws, truth tables, and Boolean rules, such as DeMorgan's Theorem. The flip- flop, the most common logic element for storing one bit of binary data is discussed in its various forms, RS, D, and JK.

Sequential logic circuits, counters and shift registers, both made up of flip-flops are discussed along with the clocks which sequence them. Digital design examples are worked through and experiments verify the results. The final section of the program explains typical applications, the frequency counter, its control, counting and display functions and the digital computer, types, orginiza- (continued on page 45)


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A new pocket size guide for "REN" replacement semiconductors for home entertainment equipment is available from Raytheon Company. The guide contains complete type -number cross references for all major semiconductor brands, including universal de-

vices, and gives suggested list prices for the more than 350 devices in the "REN" line. Copies of the new replacement guide are free at authorized Raytheon distributors.

The 1979 Kulrod Mobile Antenna and Accessory Catalog is now available from Larsen Electronics. This forty page catalog features a broad selection of low -band, high -band and UHF mobile antennas with a variety of mounting op- tions for each, Larsen Kulduckies for hand helds, and several base station antennas. Several selection charts corre- late the various mobile antennas and the many mounts available. For a free copy write: Larsen Antennas, John Beaman, General Mgr., P.O. Box 1686, Van- couver, WA 98663.

A self -teaching microprocessor design manual, reportedly written for the beginner, the interested person who simply wants to know more about the subject, and the expert, the engineer who is doing advanced microprocessor design work, alike, has recently been published by Texas Instruments, Incor- porated.

The "9900 Family Systems Design and Data Book" is stated to be the first of a "microprocessor series" of technical references and offers a more than 1000 page selection of educational and appli-

cations information to "help users develop a deeper understanding of the complex technology and tremendous potential available in microprocessors."

The "9900 Design Book" starts at the beginning, discussing the semiconductor technology on which microprocessors are based, covers the complete TI 9900 family of microprocessors, accessories and support materials, moves step by step through a "first encounter" with a 9900, describing basic concepts in an introductory application. Later chapters cover hardware and software design, architecture and inter- facing techniques, programming methods and the instruction set, and reference materials to develop software systems. Also covered are technical specifications on the 9900 family and its

real world uses. The "9900 Family Systems Design

and Data Book" is available through TI's Learning Center, Mail Station 54, Box 225012, Dallas, TX 75265. The cost is

$9.95.

A new wire and cable catalog is now available from Columbia Electronic Ca- bles. Featured in the 96 page catalog is

an introduction to each major product section and all of the company's UL and CSA approvals for its various product groups. The catalog covers Columbia's, audio, CATV, intercom, microphone, power, and television cables, and recently introduced products including computer, control, teflon -covered coaxial, booster and ribbon cables. The catalog features conduit capacity charts and a more in-depth technical section than previously. For a free copy of the catalog write; Columbia Electronic Ca- bles, 11 Cove St., New Bedford, MA 02744.

A new catalog of test equipment has recently been issued by Triplett. It covers their line of V -O -M's, the Models

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3300 and 3400 as well as clamp on ammeter accessories, test leads, and carry- ing cases. It concludes with a compari- son chart of the complete line of Triplett V -O -M's. Catalog 1978-A is available from Triplett distributors or Triplett Cor- poration, Bluffton, OH 45817.

"Home Audio Systems Schematic/ Servicing Manuals" Volumes 1, 2 and 3 are a new series from TAB BOOKS. These three manuals TAB BOOK No's 1024, 1025, 1026 cover well over 100 different model numbers of Capehart, Coronado, Channel Master, Admiral, Automatic Radio, Hitachi, Midland, Sharp, and Zenith stereos, tuners, phonographs and tape recorders. These manuals show schematics and parts lists and also show circuit board layouts dialcord stringing diagrams and exploded views of mechanical components, cabinets, tape decks and chan- gers, with parts lists-no more finding a mechanical part damaged and not know- ing what to order. Each volume measures 7 by 10 in., contains 200 pages and sells for $8.95 in leatherette or $5.95 in paper from TAB BOOKS, Blue Ridge Summit, PA 17214.

A 34 -page information packet for pro- spective purchasers of oscilloscopes is available from Tektronix, Inc. Data sheets with photographs, specifications and selection criteria are included for the 200, 300, 400 and T900 series Tektronix portable oscilloscopes. Pricing and ordering information is also included. For this information package "Portable Os- cilloscopes, (AX3797)" write: Julie Schmit, Delivery Station 76-260, Tek- tronix, Inc., P. O. Box 500, Beaverton, OR 97077.

An expanded catalog, Land Mobile Antennas, for commercial two-way communications systems, has recently been published by Antenna, Incorpo- rated. The catalog features an easy to read chart format for low -band and high -band, 3dB gain high band antennas, 5dB gain UHF antennas, heavy duty models, disguise cowl mount antennas, and base station antennas. Copies of the catalog are available free. Write on letterhead to: Antenna Incorpo- rated, 26301 Richmond Road, Cleve- land, OH 44146. ETD

NEW TUNERS NOT universal or customized. NOT seconds, culls, dogs, or oddballs. Only $29.95 for ANY new tuner. Over 5,000 in stock including Philco TT 192.

CALL TOLL FREE 1-800-433-7124

TEXAS TUNER SUPPLY 4210 N.E. 28th St., Ft. Worth, TX 76117

Smaller makes sense.

In the tradition of mini -computers and mini -skirts, great small products usually evolve from larger packages.

The new 8020A digital multimeter carries on the Fluke tradition of precision bench -top instrumentation, with this handheld, 13 -oz. DMM. Same quality and value, smaller package. And only $169.

Your 8020A goes on call with you in your pocket, briefcase, or tool kit. Wherever your job takes you and your 8020A, you can count on bench -instrument performance.

Small in size, but big in capability, with features like 2000 -count resolution, transient protection to 6000V,

six resistance ranges to 20 Me . Plus, an exclusive conductance capability for leakage measurements to 10,000 Mfg!

And, traditional Fluke quality and accuracy are guaranteed for a full year. Parts and service available worldwide. And that's meaningful when it's from the recognized leader in DMMs.

Get your hands on one. Call (800) 426-0361*, toll free, and we'll tell you the location of the closest Fluke office or distributor.

Price U.S. only.

*Alaska, Hawaii and Washington residents - please call (206) 774-2481.

Command Performance: Demand the Fluke 8020A. 2523-802C

FLUKE Circle No. 132 on Reader Inquiry Card Circle No. 115 on Reader Inquiry Card

ET'D - February 1979 / 37

The incidence of CB service is expected to rise and then level off in a few years to

become a more stable and significant area of service for the independent shop. Here as in the rest of the consumer electronics service field, speed is

important, and given the nature of the CB customer, being convincing is also sometimes important.

TEST flSTRUERT

REPORT

SNCORH >Ea.vA»...trt:aK..

Fig. 1 -The Sencore C849. For more information about this instrument circle number 150 on the Reader Service Card in this issue.

Sencore's CB 49 Portable

CB Analyzer and Performance

Tester

Simplified checkout.

By Walter H. Schwartz

There are presently available several integrated test systems for CB work, all

intended to increase the convenience, speed and accuracy of CB service. The CB49 is perhaps the only complete, portable, instrument suitable for extensive check out of a CB transceiver out of the

shop, for checking both base and mobile installations.

With its multi -scale meter the CB49 allows the technician to accurately and convincingly check power, modulation, and frequency of the transmitter, and sensitivity, frequency, and audio power output of the receiver. It contains among other things, an R.F. generator, R.F. and Audio dummy loads, test speaker, modulation, power and SWR meters, a frequency meter, and an audio generator.

To begin to run through the complete series of tests possible with the CB49 first connect it to the CB radio-only three connections are necessary-(See Figure 1) and proceed with the SWR test. The CB49 manual states, "It does not matter where the switches and controls on the CB49 are set at the begin-

ning of the tests. It is not possible to

damage the CB49 or the transeiver under test with any combination of switch settings as long as the radio complies with FCC specifications." To make the SWR test, switch to SWR, switch TRANSMITTER LOAD to "An- tenna", and press the push to talk switch. The SWR is read directly on the meter, no power or calibrate settings are necessary.

The remainder of the transmitter tests are made using the "50 ohm load" position of the TRANSMITTER LOAD switch. To check RF power output of an AM radio, swich to "RF Watts Average," key the transmitter and read the power output. A test for downward modulation, reduced output under conditions of full modulation, can be performed here also. Switch the CB SPEAKER SUB switch to "Dummy load and 1 kHz tone." Turn the TONE LEVEL control until a tone is

heard from the speaker on the side of the CB49. Place the microphone on the rub- ber pad over the speaker and key the transmitter. Increase the tone level while watching the meter. The power output will decrease slightly in most transmitters but more than a 25% decrease indi-

cates a problem in the output stage if the power supply voltage is constant. A "talk power" test can be made by setting up

as for the downward modulation test but setting the switch to "RF watts, PEP." Advancing the TONE LEVEL control should increase the power output reading from the carrier power of 4 watts or so, to the carrier and sideband peak power of as much as 12-16 watts/PEP. ET/D's old Hy -Gain V showed about 3.5 watts carrier and kicked up to 15-16 watts with the 1 kHz tone or a whistle.

A most important test of course is

transmitter frequency, which can be read directly as "Percent Off Channel" with the CB49. For SSB a 1Khz tone is

used, injected by means of the microphone-and the CB49 compensates for the offset thus produced and reads "Percent Off Channel" as on AM. The procedure takes 4 or 5 seconds per channel; we were able to check through a 40 channel AM transceiver in just about 3 minutes, since unlike using a

counter there are no limits to remember and compare.

Sencore recommends testing the re-

ceiver section for "Audio Watts," outupt, first, as an indicator of receiver operation. Set the FUNCTION switch to "RF Generator and Audio Watts, turn the CB volume control to maximum and turn the MICRO VOLT OUTPUT control for maximum output. Most CB's use the same


audio output stages for receive and transmit; the output should be at least 2 watts; ETD's Hy -Gain V showed over 3.

Receiver sensititivty-the 10dB signal plus noise to noise ratio-can be checked by an automatic, patent/ pending, method which pulses the signal and measures and compares the signal and the noise, to allow the sen -

setups is included inside the cover of the CB49 for field use.

The CB49 is also intended for bench use. Auxilliary equipment necessary would be a bench power supply and a multimeter. Under some conditions an oscilloscope would be required. The accessory NL204 EIA Noise Pulse Simulator would be useful for servicing

to Antenna

CB SPEAKER SUB SPEAKER DUMP, iuAD DUMMY 10A0

n MR/ 'DINE

3 2 OHM \. 8 OHM

0.I

1. Disconnect the antenna cable and connect it to the "Antenna" connector of the CB49.

s External Speaker

Antenna

2. Connect the "Antenna Jack" connector of the CB49 to the antenna jack of the radio.

4. Select either 3.2 or 8 Ohms for the speaker sub. If you don't know the output rating of the radio, use "8 Ohms".

3. Connect the "CB Speaker Sub" jack of the CB49 to the external speaker jack of the radio

Fig. 2 -Connections to the CB/Radio. Only three cables are required for complete testing. (Courtesy Sencore)

sitivity to be read directly from the MI- CROVOLT OUTPUT controls. The sensitivity should be better than 5 microvolts and should vary only slightly from channel to channel.

Other functions that can be tested with the"RF Generator" are squelch sensitivity, AGC and adjacent channel rejection. The accessory NL204 noise pulse simulator permits checking the effec- tiveness of ANL and ANB circuits.

Most of the tests as described are for AM operation. SSB tests differ only slightly; complete check out for SSB transmit and receive is asp easy.

The CB49 comes with a full set of cables for use with radios using UHF coaxial connectors. The alligator clips furnished on the test leads have an insulation piercing pin for easy connection to insulated power and speaker wires. Op- tional accessories include coaxial adap- ters for use in Ford or Chrysler cars, and an ac power adapter, (the automatic shut off is disabled when the CB49 is used on ac). The instruction manual is very complete. The checkout section is written in terms that would allow the non -technical person to easily check the operation of a CB Transceiver. A con- densed manual with details on all test

noise limiters and blankers and the SB214 40dB 27MHz signal booster can boost the RF signal level by a factor of 100 where needed. The CB49 frequency converter allows any 1 MHz scope be used when viewing transmitter output signal.

The bench servicing section of the manual is almost a short course in CB repair. Equipment applications and stage by stage troubleshooting are covered. Oscilloscope applications are out- lined and the appendix explains basic CB transceiver theory with excellent block diagrams.

The cost of the CB49 is $695. The AC Power Adapter costs $14.95, the CB49 scope frequency converter is $75 and the NL204 EIA Noise Pulse Simulator sells for $45.

We found the CB49 to be adequate for almost everything one could encounter when used with the auxilliary equipment listed above. It would be the only special item of equipment an otherwise well equipped shop would need to do an effective job of CB servicing. It makes complete checkout a quite rapid process and importantly the technician can show the skeptical CB'er a convincing indication of his radio's performance. Ere

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DEALER'S SIlO WORSE

Microprocessor Controlled CB Circle No. 142 on Reader Inquiry Card

Robyn's new "Computer -Based Base" includes a microprocessor, programmable memories, automatic channel scanning, and keyboard control. The model SB-540D's microprocessor has five programmable memories for instant return to favorite channels, automatic scanning at either 240 msec/ch or 2

sec/ch. and is programmed by a 15 push button keyboard. Other features are a

computer designed PPL synthesizer, LED channel readout, LED clock, dual

tuning meters, dual gate MOSFET front end, and a 70 dB adjacent channel re-

jection is specified. Power necessary is

12Vdc or 117Vac. The list price is

$529.95.

Mobile CB Antenna Circle No. 143 on Reader Inquiry Card

The American Antenna K40 is, the manufacturer states, the first base loaded CB mobile antenna to equal the performance of a full length, nine foot whip. The secret reportedly lies in the coil design, the largest machine -wound coil in

the CB industry, which is permanently molded into a single heterogenous metal/plastic assembly. The standard K40 is priced at $38.50 and mounts to trunk lip or thru the roof. The optional Uni -Mount for luggage racks, gutter mounting etc., is priced at $8.95. The Magnamount magnetic mount is priced at $15.95.

Record De-warper Circle No. 144 on Reader Inquiry Card

ELPA Marketing Industries, Inc., is now importing from Europe the "Record Puck." Simply slip it over the turntable spindle and it flattens warped records.

ATTENTION SERVICE DEALERS

Buy Directly Top Line Solid State Replacements, Original Japanese Transistors and Integrated Circuits

PARTIAL UST * MONTHLY SPECIALS Part Your Part Your Part Your Number Cost Number Cost Number Cost

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Ask for free 1979 calendar available!

Send for our complete list of Japanese parts and prices

Our Professional Replacement parts are top quality and replace over 130,000 industry types at a substantial savings to you over most other replacement lines.

To order, just send us the ECG, SK, GE, or other part number and we will promptly ship you the premium PR direct replacement, plus a free PR replacement guide. Remember-these are first quality parts-no culls, no seconds! 2 year warranty on all parts.

Orders over $25.00 shipped free, under $25 add $1 UPS. C.O.D. orders are welcome. To approximate the cost of a replacement part order, deduct 40% from dealer cost of ECG or other types. All orders shipped within 24 hours.

Write or Call-Toll Free 1-800-526-4463

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ELPA also offers a new dust and static sweeper which consists of a ball bearing gimbal suspended arm supporting a

silky fiber and copper microbristle brush to pick up both dust and static electricity. The "Record Puck" is priced at $5.00, the "Audio -Mate Grime Fighter" is priced about $30.00.

Car Stereo Cassette Circle No. 145 on Reader Inquiry Card

Arthur Fulmer has introduced, reportedly, the first after market car stereo to use pushbuttons for control of volume, balance, fader and tone, as well as manual or automatic scan station tuning. The Ultra II Model 16-6800 has a micro -processor to center tune and recall preset stations-up to 14 stations

THE AMERICAN LEGION

GOING TO BAT FOR OUR YOUTH THROUGH THOUSANDS OF

AMERICAN LEGION BASEBALL TEAMS

Circle No. 111 on Reader Inquiry Card 40 / ETID - February 1979

IN OUR SIXTIETH ANNIVERSARY YEAR

can be pre-programmed and recalled at the touch of a pushbutton. The manufacturer's specifications include 12 watts RMS per channel, up or down scan on manual tuning, auto reverse, locking fast-forward/rewind, LED readout and the company's Ultra warranty which warrants it to be free from defects in materials and workmanship as long as the original purchaser owns the vehicle in which it is installed.

Marine CB Antenna Circle No. 146 on Reader Inquiry Card

Antler Antenna has introduced a new marine model CB antenna, the "Sea - Sprite" which requires no ground plane. This feature allows its use on fiberglass,

wood or metal boats. The "Sea -Sprite" is a long -filament fiberglass stick precision wound and enclosed in a vinyl sheath. The base hinges 180° for out of the way storage and locks upright for use. The suggested retail is $28.95.

Microprocessor Telephone Answering System Circle No. 147 on Reader Inquiry Card

The ASAP 35 from Command Com- munications, a computerized alerting system will page or call, in succession, up to fifteen different numbers, at eight minute intervals, until the message is picked up. The system then resets to the

first number in memory to await a new message. It will dial a combination of rotary and tone and will accept a paging terminal's go ahead signal, before pro- ceeding with the additional tones required to select the proper pager.

TV Sound Tuner Circle No. 148 on Reader Inquiry Card

The Finney Company has just announced the TELETUNER, Model T-82, a television sound tuner designed for use with a stereo hi-fi system, to produce better quality sound. No electrical con-

nection is required between the unit and the TV set. An antenna, ie. a few feet of wire, rabbit ears, or connection to the TV antenna system through a two -set split - ter is needed. The suggested price is $179.95

TUNER SERVICE All overhauls guaranteed two full years.

Give us a try - you'll like the way we do business.

Call TOLL FREE 800-433-7124 In Texas call 817-834-8201 TEXAS TUNER SERVICE

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Take the Hassle Out of Wow and Flutter Measurements

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YOU - read Wow & Flutter with the six range Analog Display. -read Actual Drift -frequency or %-with the Digital Display. -get Results Fast...without leveling problems. -choose the Standard DIN, CCIR, IEC, NAB or JIS. - have IEEE 488 bus interface provisions for remote control.

RE 403 for Analysis YOU

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can get full information and specifications from-

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new PRODUCTS

DMM Circle No. 151 on Reader Inquiry Card

A handheld, LCD, digital multimeter intended for field use has been introduced by Data Precision. The Model 935 is

small and rugged yet offers 31/2 digits and 0.1% accuracy, states the manufacturer. Twenty-nine ranges of ac and dc voltage and current and resistance

MODEL

520B

Industrial Transistor Tester Now with XI LO Drive WOM1 In-oh/cull when others won't Identifies ell three IronsIsmr leer. Random teed connecgon Audibly end visually IndIrates GOOD transistor Automat, HPN/PNP determmtlon Positive Si Ge antltic.Ton Tests M

lW

Modes. SCRA, FET'e. and Derlingtone CSA approved version available

measurement are available via pushbutton switches arranged for one hand operation. A 9V alkaline transistor battery will power the 935 for over 200 hours of continuous use and an ac adapter is

available for bench use. Calibration interval is indicated to be one year. The Model 935 is priced at $149.00 including test leads, battery, instruction manual and one-year warranty.

Wiring Pencil Kit Circle No. 152 on Reader Inquiry Card

Vector Electronic Co. offers a wiring pencil kit with a variety of tools and breadboarding hardware at significantly less cost than that of the individual items purchased separately. The kit includes the P187-1 wiring pencil with a 400 ft spool of 36 gauge insulated wire, the insulation of which melts away when

soldered with a 750° iron. Also included are a wire cutting chisel tool, a terminal instalation tool, 120 ft of bare 30 gauge wire, 100 terminals, 20 wire spacers, 4.5 by 8 in. Vector board and four pedestal feet for the board. The kit is priced at $13.90 and the P178-1 pencil is available separately for $7.95.

Dual Trace Oscilloscope Circle No. 153 on Reader Inquiry Card

Gould, Inc. now offers a new low cost 12MHz portable oscilloscope. The 0S253 offers dual trace and X -Y display capability, 2 mv. sensitivity, Z-axis input and an 8x10 cm display, ranges from 500 ns/cm to .2 s/cm plus X5 expand. Triggering is dc coupled from an internal or external source with positive

Transistor Testers 510

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Foal and thorough L000/8AD Tem. FE, and SCRS .n -circuit or .1.1-ciecull Connect ens teat cop lo any componen1 lead

araireralre-Over 100 hour. of era.. hem tingle

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o SCR's Automatic types end N l orP,ohann I FETA

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es capacitance from

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42 / ET/D - February 1979 Circle No. 116 on Reader Inquiry Card

or negative slope selection and level control. The 0S253 carries a 2 year warranty, weighs less than 131/4 lb and sells for $695.

Digital Multimeter Circle No. 154 on Reader Inquiry Card

NMEr-6º10X t 018nK 9MILT1M9r8K CM pr9

y MOOg 99p--+

PC Y+ Bs-

t6C1M+

4111 PM! AC+M-.-.+'.....

RANGE

The ME -521 DX digital multimeter from Soar Electronics is a 31/2 digit, five function, automatic zero, automatic polarity, overload protected, unit, with high and low power on all ohmmeter ranges. Low current drain battery operation and

light weight, mean convenient portabil- ity. Measurement ranges are up to 100Vdc and 600Vac, 100mA ac and dc and resistance to 20 Megohms. Ac- curacy is stated to be typically 0.5%.

Concealed UHF Radio Antenna Circle No. 155 on Reader Inquiry Card

A totally concealed UHF communications antenna with performance, reportedly, equivalent to external antennas has been announced by The Antenna Specialists Co. The ASP -1000 is similar in design to antennas designed for jet aircraft. It produces a vertically polarized

MAKE SURE you get paid for every inch of wire sold

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AREA 216 821-2320

MANUFACTURING CO. ET -161 East State Street ALLIANCE, OH 44601


The only thing you need to know about Quartz Crystals is...1-405-224-6780

When you call that number, you reach an expert who is backed by the world's largest stock of crystals and who can give you info - advice -and service second to none.

Sentry gives you: Best Delivery plus Emergency Service with Guaranteed Delivery Highest Quality with gold MIL -C-3098 Process Ask for Sentry Technology Manual I

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254 102 30 25C 1014 20 HA 13394 3.00 254 234 59 25C 1018 80 A 1366 2.90 254 473 59 2SC 1030C 2 40 HA 1366W 2.90 254484 1.95 2SC 1061 HA 1366WR 2.90 254 495 40 2SC 1019 3.90 LA 40310 2.25 254 492 1.30 25G 1096 LA 4032P 225 2S4 509 40 2SC 1098 70 LA 4400 2.40 294 561 40 25G 1111 280 LA 44004 2.so 254 562 40 2SC 1124 1 00 LA 4420 2.50 254 5444 30 2SC 11228 355 4151513L 2.50 254 834 50 25C 1123 60 STK 011 1.10 25A 613 45 2SC 1228 60 STK 013 8.80 254 673 45 25C 12264 60 STK 015 490 258 628 45 25C 1239 290 STK 435 5.60 254 682 1.00 29C 1306 1.60 TA 7045M 2.50 OSA 683 .40 25C 130) 240 TA 1060P .90 254 884 45 2SC 1318 45 TA 7061P 120 OSA 695 59 25C 1383 .40 TA 7062P 1.40 254 6994 .20 25C 1384 45 TA 70890 2.50 254 208 1.10 25C 1419 80 TA 72020 290 254 219 40 2SC 1625 30 TA 72030 2.90 294 720 40 2SC 1628 1.40 TA 2204P 2.50 254 733 30 296 1728 ºa TA 22050 2 00 254 242 4.90 25C 1230 59 TA 1310P 1.60 254 818 90 2SC 1260 90 T6A 810S0 240 254 .1 30 ]SC 1816 1.95 TC 5080P 5.30

2SC 1856 20 TC 5081P 3.40

2SB 25C 1908 40 TC 50820 3.90 25C 1909 225 UHIG 002 490

258 22

250 54

40

30

25G 1945 2SC 1957

5.60 80

1.101C 004 UH1C 005

4.90 4.90

258 75 45 25G 1910 2.80 UPC 20C 2.80 250 125 30 2SC 1928 6.60 UPC 563 2.40 25B 186 30 2SC 2028 20 UPC 515G2 1.60 25B 324 40 25C 2029 2.00 UPC 576 2.40 2513 332 90 2SC 20)6 20 UPC 592141 .90 2SB 405 40 25C 2091 1.20 UPC 1001 2 40 2SB 402 1 00 2SC 2092 2 25 UPC 10080 4.º0 2S6 434 1 00 250 2166 1.80 UPC 1020H 2.40 25B 435 1 20 UPC 102s0 240 2SB 463 tse 423

1 20 1 00 2SC

UPC 1154 UPC 1155

2.50 2 5

258 424 sa 25D 72 70 UPC 1156 2.40 2SB 492 80 250 234 80 UPC 14305 3.40 25B sot 1.00 253 235 UPO 861 950 258 52813 90 250 261 45 UPD 852 950 256 595 1.50 25D 282 2.90 UPD 858 2.00 259 596 1.50 250 313 80 PLL 014 4.80

2581 315 80 PLL 024 590 2SC 2SD 325 80 Pll 034 8 80

25D 427 2.25 25C 281 40 25D 525 1.20 DIODES 25C 372 2SC 323

30 30

2SD 526 1S 84

1S 332 25C 360 30 FET 2SC 391 25C 458

30

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25G 495 60 250 23 90 Is 1209 45

2SC 509 45 290 30 50 IS 1211 45

2SC 5154 1.00 2SK 33 .80 IS 1555 25 2SC 517 3.00 2SK 55 IS 1588 2SC 535 40 3SK 22Y 1.80 19 ISM 20

2SC 4344 .45 3SK 39 1.20 13 2028 25

29C 999 1.30 31114 40 1.20 1S 2083 45

2SC 210 30 39K 41 1.80 18 2423 2SC 111 2SC 730

30 3.40

36K 45 3514

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1N 34

1111 80 15

2SC 732 3SK 49 1.60 100 1 40

2SC 735 100 10 2SC 138 200 vole 40 25C 256* 200 2SC 7111 2.40 N2140 1 90 29C 2M 40 AN 239 1.90

2SC 299 2.50 AN 242 3.00 WZ 071

2SC 828 30 AN 274 1.95 W2025 25

2SC 039 40 AN 313 340 WZ 090 25

29G 862 3.20 AN 315 2.25 WZ 120 25 25C 8624 3.20 BA 5114 2.25 WZ 192 25 2SC 897 250 BA 521 2.40 35C 930 2SC 945

30

30

HA 1151

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IMMEDIATE SHIPMENT WITHIN 48 HOURS Minimum order SS. 00 Add 51.00 postage Ouantity discount prices - Mtg. inquiries Welcome

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FUJI - SVEA ENTERPRISE a Division of Fuji-Svea Incorporated

P.O. Box 40325 Cincinnati, Ohio 45240

TOLL FREE Nationwide 800/543-1607 TELEPHONE Ohio 800/582-1630

Hours: Mon. -Fri. 1d-7; Sat. 11-5

Toll Free Order Line 1-800-654-8850 Circle No. 131 on Reader Inquiry Card


radiation pattern and is made to fit the space originally intended for mounting a

6x9 in. rear deck speaker. The power rating is 125 watts, the bandwidth is

stated to be 5 MHz with tuning coverage of the 406 to 512 MHz range.

Solid State Rectifier Circle No. 156 on Reader Inquiry Card

Electronic Devices, Inc. has increased its line of solid state replacement vac- uum tube rectifiers with the addition of the EDI R3DR3 Solid Tube. These have all the advantage of solid state rectifiers along with, reportedly, a higher mark-up for greater profit.

Dust Removal Spray Circle No. 157 on Reader Inquiry Card

Projector Recorder Belt Corporation has recently introduced Dust -Away, a new service aid for removing dust, lint and other foreign materials from sur- faces too delicate for the use of other liquid, chemical or mechanical methods. Dust -Away is a non-toxic, nonflammable aerosol gas; 1300 seconds of one second blasts per container can be expected, the manufacturer states, at a

cost of $1.55 for a 10 oz can.

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CONTENTS.

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Test Cassettes Circle No. 158 on Reader Inquiry Card

ORA Electronics offers a line of cassettes for a variety of tests and measurements in cassette decks. Model PTC-1 is a 300Hz tone recorded -10dB for playback level tests. PTC-2 is a 1 KHz

tone (0dB) for signal to noise measurement tests. PTC-3 is a 3KHz tone (0dB) for speed drift, wow and flutter tests. PTC-4 is a 6.3KHz full track -10dB tone for tape head azimuth and phase alignment. PTC-5 is a multi -tone tape for frequency response tests.

Digital Multimeter Circle No. 159 on Reader Inquiry Card

The Model 2000A is a new portable auto -ranging digital multimeter from Alco Electronic Products, Inc. This DMM features minimal controls and a

31/2 digit LCD readout. It has autozero- ing, auto -polarity sensing 1 mV resolution with full auto ranging to 1000 V, dc

or ac, 2000K ohms and 200mA at a

stated .3% accuracy. The suggested price is $195.00.

DVM Temperature Probe Circle No. 160 on Reader Inquiry Card

A solid state temperature probe for use with digital or analog voltmeters is now available from B&K Precision. The

Model 7P-28 gives accurate temperature readings, within 1.7° C, over the range of -50° to +150° C, of liquid, gas or solid, according to the manufacturer. It can be used to locate hot spots or measure the temperature of individual components. The TP -28 will operate for over 120 hours on a 9V transistor battery. The user price is $75.00.

Nickel Cadimum Battery Discharge Analyzer Circle No. 161 on Reader Inquiry Card

Nickel-cadimum batteries exhibit a

memory effect. Shallow charge discharge cycles result in the battery's loss of ability to be fully charged. Reliable Measurements Systems new Nicada- lyzer reportedly precisely discharges Ni -cads sufficiently to allow them to take a full charge at each recharging.

How CPR training helps business.

CPR-cardiopulmonary resuscitation training is one of the valuable assets an employee can have.

If even one employee has this training. (which Is available from Red Cross). every other co-worker benefits. Everybody. can breathe easier knuwine that in the event of a cardiac arrest, help is immediately available.

Why not set up a goal for your company...so many employees with CPR training per flour-or area?

It's easy to do. Call your Red Cross Chapter... they'll he glad to help you do it.

CPR training from Red Cross is one way you can help your company be ready. And a slay you can help keep Red Cross ready. too.

Keep Red Cross ready. A Public Service of This Magazine

c u* & The Advertising Council


QUASAR continued from page 21

mentioned earlier, in the absence of a

VIR signal, the circuit reverts to either manual or Dynacolor operation.

0651, the flesh control blanker, disables the flesh control circuit in IC601 during vertical blanking to permit passage of the VIR signal on the 19th line of each field.

Power supplies While the TS -965 power supply is similar to those used in other Quasar chassis, most other line operated chassis use a

bridge rectifier. However, the 965 has a

single power diode as a half wave rectifier. The filtered DC is then applied to Q802 which maintains a regulated +123VDC (see Fig. 10). Q801 is a

reference amplifier which controls the conduction of Q801.

In the TS968 chassis a ferroresonant power transformer provides line isolation and regulation of the B -plus supply voltage with line voltage variations. The transformer's secondary is tuned to resonance by a 6.8 mfd capacitor. The Q of the tuned circuit varies inversely with load variations to maintain a constant output voltage.ETD

MULTIPLIERS continued from page 34

frequency multipliers at very high frequencies. Although varactors are very interesting devices it is beyond the scope of this article to examine them. It is suggested that the reader look at varactors as an intriguing subject in the texts available elsewhere.

Although frequency synthesizers have reduced the need for multipliers in some equipment, there is still a very important role for them at high frequencies and powers, and anyone working with communications equipment should have a good basic understanding of what makes them tick.

Summary Anything that affects the input conduction angle makes a big difference in the output of the multiplier, this includes the supply voltage, if the bias comes from the supply (which it usually does) ... and the drive level, which also depends on the supply voltage as well as the previous stage and the input tuning. Output tuning and loading are critical, as well as parts placement and lead dress. Lead length in the emitter, emitter bypassing, and bypassing in

general are critical, since negative

feedback has a very bad effect on multiplier performance. Replacing the transistor involved with a "substitute" with slightly different internals is also a bad risk. Tuneup must be according to the book, since we are not tuning for fundamental but rather a harmonic which is always a trickier job. Changes in resistors which affect biasing can markedly affect the performance, although tie voltage readings all look OK ... we are simply trying to put out a

different harmonic content, or altering efficiency .. and that doesn't show very readily except in poor performance. ETD

CONTINUING EDUCATION continued from page 35

tion, and operation and simple programming.

I found the program to be extremely well organized, each unit building on the previous. I would strongly recommend that the material be followed as pres- ented. Read everything carefully, do each problem, answer each question and do every experiment step by step. Heath has crammed a maximum of training into this program and everything is essential.

The cost of the Digital Techniques Learning Program is $59.95. The optional cassettes, which duplicate the records in a more convenient form, cost $6.95. The trainer cost is $79.95 as a kit and $129.95 assembled. The program complete with kit trainer is $129.95. fT/D

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FUJI - SVEA ENTERPRISE a Division of Fuji-Svea Incorporated

P.O. Box 40325 Cincinnati, Ohio 45240

TOLL FREE Nationwide 800/543-1607 TELEPHONE Ohio 800/582-1630

Hours Mon -Fri 10-7, Sat 11-5


OLRhSIIED RATES: 40 cents per word (minimum charge, $10). Bold face words or words in all capital letters charged at 50 cents per word. Boxed or display ads charged at $50 per column inch (one inch minimum). For ads using blind box number, add $5 to total cost of ad. Send ad copy with payment to Dawn Anderson, ELECTRONIC TECHNICIAN/DEALER, 1 East First Street, Duluth, MN 55802.

BOX NUMBER REPLIES: Mail box number replies to: ELECTRONIC TECHNICIAN/DEALER, Clas- sified Ad Department, One East First Street, Duluth, MN 55802. Please include box number in address.

FOR SALE

TELEPHONES UNLIMITED, equipment, supplies, all types, regular, decorator, keyed, modular. Box 1147T, San Diego, California 92112. 4179

Automobile radio and tape replacement parts: Delco, Chrysler, Philcoford, Motorola, Panasonic and many others. Large inventory. Laran Electronics Inc. 3768 Boston Road, Bronx, NY 10469 (212) 881-9600 out of New York State (800) 223-8314.

TV AND RADIO TUBES 36v EA!! Send for free color parts catalog. Your order free if not shipped in 24 hours. Cornell Electronics 4215-17 University San Diego California 92105 TF

MECHANICALLY INCLINED INDIVIDU- ALS-BUILD ELECTRONIC DEVICES IN

YOUR HOME. GET STARTED IN YOUR SPARE TIME. $300 TO $600/WK POSSI- BLE. EXPERIENCE NOT NECESSARY. WIRTE FOR FREE LITERATURE. ELEC- TRONIC DEVELOPMENT LAB., BOX 1535 (B), PINELLAS PARK, FLA., 33565. TF

SONY -PANASONIC -RCA -ZENITH -EXACT REPLACEMENT PARTS-LARGE INVEN- TORIES-SEND PART OR MODEL NUM- BERS-WILL UPS COD-GREEN TELE RADIO DISTRIBUTORS, 172 SUNRISE HIGHWAY, ROCKVILLE CENTRE, N.Y. 11570

MATV-CATV INSTALLERS Get lowest prices on antenna accessories, fastest service from ANTSCO CORPORA- TION. Call collect, ask for catalog & prices. All orders shipped same day. Sierra Madre, CA 91024. 213-355-2510. 8/78

Early Sams' Photofacts, $4.00, cheaper in quantities. Special, first 350 Photofacts in 35 binders, $495. Also Rider's manuals. Reit- man. Box 46, Highland Park, IL 60035.

PICTURE TUBE MACHINE We buy and sell NEW AND USED CRT rebuilding machinery. COMPLETE TRAINING. Buy with CONFIDENCE from the ORIGINAL MFGR. For complete details, send name, address and zip code to:

LAKESIDE INDUSTRIES

4069-71 N. Elstone Ave., Chicago, IL 60618 Phone 312-583-6565

LINEAR AMPLIFIER, 2-30 MHz, 100 or 200 watt solid state. 300 MHz COUNTER. Mod- ulation BOOSTER. Omnidirectional BASE ANTENNA. Plans $3.00 each. $10.00/all. Catalog of others. Panaxis, Box 130-ET2, Paradise, CA 95969

GENUINE SONY SEMICONDUCTORS- CHECK THESE PRICES!! EG. 1-9/ 10-24-SG613-8.50/7.30-SID 30-15 2.60/2.30, -2SC867A 5.10/4.90- 2SC1114 5.50/4.80-25C1358 6.50/5.70, -25C1124 1.50/1.30-25C634A 0.45/0.41. Contact us for complete list of Japanese semiconductors and pricing information. Bescor, 547 S. Broadway, Hickville, NY 11801 (516) 822-3988

REPLACEMENT COLOR YOKES -DEAL- ERS ONLY. Zenith 95-2501-2532-2638- 2667-S89633 etc. $16.95. Magnavox 361380-1 $18.95 etc. Sylvania, G.E. etc. $14.95 to $19.95. Request for price list on your letterhead. David Sims Enterprises, Inc., 665 Jerricho Turnpike, Huntington Station, N.Y. 11746, 516-549-3925 TF

REPAIR TV TUNERS -High earnings, Com- plete Course Details, 12 Repair Tricks, Many Plans, Two lessons, all for $2. Refundable. Frank Bocek, Box 3236, Ent., Redding, CA 96001. T/F

New -revolutionary new type of antenna center connector for use with all types of wire antennas. No more splitting of coax. For more info & free brochure, write: H & S products, 1706 Magnolia St., Gardendale, AL 35071.

send a message... ...write here.

1. Number of insertions: (circle) 1 2 3 6 12

2. Start with (month) 3. Amount enclosed: $

PAYMENT MUST ACCOMPANY ORDER. WE'LL BILL RATED FIRMS

issue (Copy must be in by 1st of month preceding)

NAME COMPANY

STREET

CITY STATE ZIP

MAIL AD COPY TO: DAWN ANDERSON, ELECTRONIC TECHNICIAN/DEALER, 1 EAST FIRST STREET, DULUTH, MN. 55802. RATES: 40 cents per word(minimum charge, $10). Bold face words or words in all capital letters charged at 50 cents per word. Boxed or display ads charged at $50 per column inch (one inch minimum). For ads using blind box number, add $5 to total cost of ad.


THERE'S NO NEED TO BUY ORIGINAL JAPANESE TRANSISTORS WHEN OUR REPLACEMENTS WILL DO THE JOB of many original types. Phyltron's LX123A replaced over 50 Japanese types in our catalog. Don't tie yourself up with excessive inventory, buy Phyltron Electronics replacement transistors and save.

Write for free catalog. One year uncondi- tional guarantee. Phyltron Electronics, 487 Springfield Ave., Summit, NJ 07901. TF

TUBES-Receiving, Industrial and Semi- conductors, factory boxed. Free price list. Low, low prices. TRANSLETERONIC INC. 1365 -39th Street, Brooklyn, N.Y. 11218E 800-221-5802,212-633-2800. 4/79

ELECTRONIC BARGAINS, CLOSEOUTS, SURPLUS! Parts, equipment, stereo, industrial, educational. Amazing values! Fascinat- ing items unavailable in stores or catalogs anywhere. Unusual FREE catalog. ETCO- 013, Box 762, Plattsburgh, NY 12901. TF

FOR SALE: COLOR PICTURE TUBE RE- BUILDING EQUIPMENT SEMI/AUTO- MATIC ELECTRONICALLY CONTROLLED PROCESS. Call or write Atoll Television, 6425 Irving Park, Chicago, IL 60634 Phone 312-545-6667. 2/79

Save hundreds: dependable, quality Head - Ends, V/V, U/V Converters, Camera Mod- ulators. Factory prices. Send $5.000 (or business card). "Information," Box 809, Boynton Beach, FL 33435.

RCA Sales and Service for sale in Rolla, MO. 1977 Gross $102,243.63. Asking Price $27,000. Call 314-341-2510 between 9 and 5 or write S. E.S. Electronics, 620 Pine, Rolla, MO 65401.

F. C. C. 1st, 2nd, 3rd questions, answers, "explanations" compiled from technical schools, colleges, avionics companies. $11.00. S. Mager, Box 26151, Los Angeles, CA 90026.

BUSINESS OPPORTUNITIES

T.V. Sales and services. Sacrifice. Must re- tire. Well equipped and stocked reasonable rent. Est. 18 years. $18,500.00 walk out. 1-305-723-6161. Melbourne Florida.

MOVING TO FLORIDA? TV SERVICE AND RENTAL BUSINESS FOR SALE ON FLORIDA'S WEST COAST. DOING $40,000 - $50,000 PER YEAR. ALL REASONABLE OFFERS CONSIDERED, ALSO BUILDING AVAILABLE. CONTACT: MR. SOTHERN, 1-813-535-2026 AFTER 7 PM OR WRITE: 1834 SUNRISE BLVD., CLEARWATER, FLORIDA 33520 TF

BROADCAST STATION. Start your own, any type! Unique Cable FM station operation- investment/experience unnessary! Receive free tapes, records. Get your FCC license! Much more. Free details. "Broadcasting:", Box 130-ET2, Paradise, CA 95969

Florida T. V. Service for sale. Same location 20 years. Complete Sams, up to date, many other schematics, parts and good customers. $12,000. George Pappas, 8000 -19th Ave., N. W., Bradenton, FL 33505.

T.V. Radio Service Co. So. Calif. High Des- ert. Fastest growing area in Calif. Over $75,000.00 gross. Prime location in busy shopping center. Well established with accounts. Contact Dan Harley 714-245- 7800. 2/79

TV Business Located in Hompton, Va. $18,000 including Trucks & Inventory. Estab- lished 5 years. Great Potential. Call Alexon- der Realty, 34 West Queens Way, Hompton, Va. 23669. (804) 723-1303. 2n9

WANTED

WANTED: PICTURE TUBE REBUILDING MACHINE, working or not. Call or write: Atoll Television, 6425 Irving Park, Chicago, IL 60634. Phone 312-545-6667. Hours 1-8 PM. 2/79

ELECTRONICS/AVIONICS EMPLOYMENT OPPORTUNITIES. Report on jobs now open. Details FREE. Aviation Employment Informa- tion Service, Box 240Y, Northport, New York 11768. 8/79

The book that turns businessmen into best sellers.

Many who've read it are now reaping the rewards. Because they've found that U.S. exports are a more than $100 billion a year business, that exporting creates both company profits and company growth, that U.S. goods have never been more competitive in international markets. Above all, they've found that, with the help available from the U.S. Commerce Department, selling over- seas is no more difficult than selling at home. And this fact -filled book can prove the same to you. Write The Secretary of Commerce, U.S. Dept. of Commerce, BED 8B, Washington, D.C. 20230.

U.S. Department of Commerce rirelA

Public Service of This Magazine The Advertising Council


projection television

COMPLET SYSTEMS

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PROJECTION TV HARDWARE AND COMPONENTS Whether it's simply our brilliant lens, our hoods, bases, cabinets or screens ...to a complete projection system... you deserve the best. So, write to the largest supply house and manufacturer of quality parts for Projectapix's big catalog on parts, components, accessories, screens and stands. Everything shipped is guaranteed or your money - refunded. Can we promise any more?

MFR. & DLR. INQUIRIES INVITED Send $1 For Complete 8 -Page Booklet On Projection Tv Construction Plans.

PROJECTAPIX, LTD. 300 WEST 53 STREET

NEW YORK. N.Y. 10019

TELEPHONES: (212) 765-7869 Circle No. 127 on Reader Inquiry Card

DIGITAL MULTIMETER M - 1200

$69.95 Kit $89.95 Assembled

Comparable value $189.00 10 Day Money Back Guarantee

3-1/2 digits .56" high for easy reading High accuracy, 1/2% typical 10 megohm input impedance Input overload protection to 1000V Auto zeroing, automatic polarity Overrange indication Low ohms, .01 ohm resolution AC line operation. Battery optional Measure resistor or diode in circuit

SPECIFICATIONS DC volts Range 200MV, 2V 20V, 200V, 1000V. Resolution .1MV DC Current Range 2MA, 20MA 200MA, 2 amps. Resolution 1 microamp AC volts Range 200MV, 2V 20V, 200V, 1000V. Resolution .1MV AC Current Range 2MA, 20MA 200MA, 2 amps. Resolution 1 microamp Resistance Range 20, 200, 2k 200k, 2 meg, 20 meg. Resolution .01 ohm

Send check to:

ELENCO ELECTRONICS, INC. 1936 Raymond Drive

Northbrook, Illinois 60062

C.O.D. add $2.50 Battery optional add $10.00

READER SERVICE INDEX ADVERTISER'S INDEX

138 B & K Precision/Dynascan

Corp. 20

106 Bell Industries,

J. W. Miller Div. 48

107 Bell Industries,

J. W. Miller Div. 48

108 Channel Master 11

109 Cooper Group, The 34

110 Cornell Electronics 36

111 Devco 40

112 Elenco Electronics 48

113 John Fluke Mfg.

(for info) 22-23

114 John Fluke Mfg.

(for demo) 22-23

115 John Fluke Mfg. 37

116 Fordham Radio Supply

Co. Inc. 42

Fuji-Svea Enterprises 43, 45

General Electric, Tube Div. 3

117 Gould Inc./Instruments Div. 7

118 Group Technology 39

119 Hykon Mfg. Co. 43

120 Leader Instruments Corp. 5

121 London Co., The 41

122 Modular Electronics Services 36

123 MTI 39

124 National Camera (NCTTD) 21

125 New -Tone Electronics 14

102 PTS Coy. 2, 1

126 PTS 34

127 Projectapix Ltd. 48

128 Quietrole Co. 48

129 RCA Consumer Electronics 8-9

RCA Distributor and Special

Products Div. 32-33

RCA Receiving Tubes 13

131 Sentry 43

132 Texas Tuner Service 37

133 Texas Tuner Service 41

104 Triplett Corp. (for info) Coy. 4

105 Triplett Corp. (for demo) Cov. 4

134 Tuner Service Corp. 4

VIZ Test Instruments Group 27

103 Workman Electronic

Products Inc. Coy. 3

137 Zenith Radio Corp. 15

This index is furnished for the readers' convenience.

However, the publisher can not guarantee its accuracy

due to circumstances beyond our control.

a

¡role The Original...

A First in the industry, with over thirty years of use by satisfied customers.

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TV TUNERS, SWITCHES, ROIS. POTS., RELAYS. AC

CAUTIO

1 NET W

Spray Pack Mark II

gets into places of close tolerance and washes out the dirt, leaving a thin film of lubricant which lasts indefinitely, with zero effect upon current capacity and resistance.

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has been tested and proven in the Space Age and is still the finest lubri-cleaner available. It is quick, safe, effective - a MUST for every tool caddy.

Available from LEADING jobbers.

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803-582-4837


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For your copy, please circle number on the reader service card. Circle No. 107 on Reader Inquiry Card

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19070 REYES AVE /BOX 5825 COMPTON, CALIFORNIA 90224

orm4 Circle No. 112 on Reader Inquiry Card


T L

COMJ PLETE MANUFACTURER'S CIRCUIT DIAGRAMS

SCHEMATIC NO. SCHEMATIC NO. MIDLAND SYLVANIA B & W TV Model 15-035 1776 Color TV Chassis E49-2 1778

SANYO SONY Color TV Model 91C82 1777 B & W TV Model TV970 1779

Usi

ion 10 of v

LIOI

9ATT2RT 12-I4VOCj

AC 120V 60HZ

. VHF TUNER

I.t

0 105 ue110-0.0

,., DELAYED

111

03 rag

s.

un 1oP

0 101 1C 15N / 101.11

01103

L.

A.G.C.

0 102 ne15.n0111 TI01

C .011 7013

.04

0. 00 OP .004

I.

33

a:a- : aul00v3114002

nu, C.R.T.

4

050.

NOTES I All resistance values in ohms K=1.000 M=1,000,000

All capacitors not noted in schematic diagram are In pF The 3rd numeral of capacitance value indicates 10'n multiplier (Ex 683.,68,000pF)

3. voilage reading taken with "VTVM" from point indicated to -hass;s ground, tuner on unused channel, contrast at maximum, A G C fully clockwise, other controls at normal.

4 D C voltages n(! are values for normal signal input 5 Voltage .ending may vary ± 20 6 Slight variations between set and schematic diagram may be ,

noted due to production improvement

UHF TUNER

0 103 110TQ0 /50151 Tt O2

WF- 4

503 C.01 .131 eel I r

WF-1

13

WF- 3 T C>->

e.e.

403 RAM e 30411 a Ir

e .'Y 0

0402 250045-0.11

00Ve L50o

H -HOLD

0201 L301 111C041111C0411-0.01, r-:-t

...e.11i e(..("

0104 2415-0,1

4-

TIK

0140

1'501

3.409

340

0403 2ºc45- 0,8

T ;e2

r)713503 210s40 -My 21c 51311

3130,100v WI

0 202 1sC1101/25cNº-0,'f

030 11800

Ca 0

31

0404 25Co000 -

2.1,3

.eeé 3 I

alOW

F. 8.T

1776 MIDLAND B & W TV Model 15-035

FEBRUARY 1979

* IMPORTANT SAFTY NOTICE THE SHADE AREA ON THIS SCHEMATIC DIAGRAM X -INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FIRE AND

ELECTRICAL SHOCK HAZARDS WHEN SERVICING IT IS ESSENTIAL THAT ONLY

MANUFACTURER'S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC

111.1

V271 C R. T.

N

WAVEFORMS

WF -1

2V P -P WF-1 H

2V P -P

WF-2 V

6pV -P WF-2 H

110V P -P

r n r

WF-3 2v P -r

1 i

WF-4 V 11.1V P -P

WF - H

11.5V P -P

1 _-

WF - 5 2 V r- WF -6

i0V P-

WF -7 5.2V r -r

WF -B 1.V P -P

WF -9 V P-

WF -10 1V P-

jr1

COPYRIGHT 1979 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET, DULUTH, MINNESOTA 55802

1777 SANYO Color TV Model 91 C82

FEBRUARY 1979

NOTES:

1. All resistance values in ohms K=1,000, M=1,000,000.

2. Unless otherwise noted in schematic all capacitor values

less than 1 are expressed in mfd, and the values more than 1 are in pF.

3. Voltage reading taken with "VTVM" from point in-

dicated to chassis ground. Voltage reading taken using a color bar signal VHF channel 11, all controls at normal, AFT, AUTO-BRICON and AUTO -COLOR switches in

IT/Dumm COMPLETE MANUFACTURER'S CIRCUIT DIAGRAMS

PRODUCT SAFETY NOTICE; The components designated by

a star (*1 in this schematic diagram designates components whose value are of special significance to product safety.

Should any component designated by a star need to be replaced,

use only the part designated in the Parts List. Do not deviate

from the resistance, wattage and voltage ratings shown.

UH NTONANIENMIrvA1 UTE áEgOHM MIN

7egZ27LLRpIJ

L L9M

I 1

RNTÉNÑF

BÓÁRD AL 11

1

L903

TEL EieCO IC/

NN rFaMINñL

euT

UHF/VHF COMRINED TUNER

ÓUTII

TP UB Sw vB AGC AFT E

se

"OFF" position, line voltage 120 volts. Some voltage

may vary with signal strength. éÉ r 4. Waveforms were taken with color bar signal and controls

adjusted for normal picture. Waveforms marked with '- may vary with signal strength.

5. The symbol indicates fusible resistors. They pro- tect the circuit from possible damage by short circuits. 1562 133 - TUNER o

TUNER AB 084

118.21

rN HEGSBUARO

2e-BBrvHFI 3e-BBIUH

115BBj Ileesl

TO PRE SET TUNING BOARD BO

A n1

'19V

--_ÌFIÑPUT

CIRICUÌT BORRA

PRE SET TUNING

i

I28-óx HF'B 6N

TUNER AGC

T. Pt

MAIN SIGNAL CIRCUIT BOARD

OM'

¡MT

AFC 10002 LA1354M

or TA 7070P

Ì C128

_ 1 C129 15 I r

CI26 T '

L --J3 u

R129 1500

C134 I000

0130 1500

ÌCÚ00 'AS

1

I _

T107

T108

ID ®® ID 0 O 06 85

F AMP CM TAGE EGULATOO

IC132

y C121 '1000

=1000 1C131 C13o

2 1o00 L

R1285 330 ?

x19V

= 1000

g8R102

1h

D105

1 CIU2 El! ,

I

1K 08101

E2 I 1 ADJACENT 'CHANNEL I SUPPRESSION

TÌ01 I 15l03ÿ 4125MHr I

I 3981

;TRAP I

1103 I

47 I CÚ82 6 TRAPN11HI

L 1311 ONINOL '.----a-11 SHIELDED WITH METAL CASE

TosweD7.2 .18

TO v.14

TO 5W 906 1

üPl

ó PB a

T101

1

ea

'20V

D101 14

2200

R107- 1K

.1. R108

' CI08 0.047

SHIELDED WITH METAL CASE J

1ST PIF AMP. & ACC IC101 TA 7175P 4r LA 1353

RF AGC 102 81800 w4

6V 64v 24

TUNER AGC AMP

4V 4K

CiDS 1000

12V 33V

KE VED AGC

`--FROM 12

R103 180E

3V

755 Ì5V

4V 15

4 R1 56004

8113 360

V-

" I

C125 C174 J310 rzulBT

R121 fi7)6-. 39

C138 C137 C119 001 001 4700

Ì Ì Ì SL6tt4 50

1104

Ì I 61

TP3

114 72.-

R115 I`_f 5600

17Vpp Harm

C123 C2D1 1 IFf

4Ri8

19V

I=1x101

VtItR117

7110

L

57V- 4 6,2

13201

- LC201

L__ J

2ND PIF AMP. 0701 2SC 1666

x201

SIF AMP IC707 LA 7365

L701

2v

0202 - 68

L

4ó2LMTRAP LC101

T105 0181 r r- -- 1

1p lI 'M'

L1 I

SOUND REJECT

R119S yy115 130 4 ro,

VR104 A00

-i

C204 100m1,1

8201 270

1ST VIDEO AMP. 0157 ISC536

er 2SC945A

R125 IOK

VA

L102 x'1121 2700

0123 5600

13120 ñ IIKI

1118

820 C,16T 117

Im 1

SHIELDED WITH METAL LASE

4V

LISO

J

TO REMOTE CONTROL BOARD

6.3V

IÓ12)°1

5 it Vail MIN.

8708 3900

HD°12

Wit IIiiNNHI IfHNNNM d /

ABL 0154 ISA564

4r ISA495

+20V

2ND VIDEO AMP. 0152 2SC536

4r ISC945A

8175 U 11;0 170

N - rn

1/5

7v

U 95 R174 5600

TO 0445

RI55 VR151 R157 1K 5K 5600 VA V44 VA

0 6LJL8500

Y1 C1521

[ 54 R500

1

R159600 t T 44V

LT J 513160 L151 OK

LINE v -

L 1000

1C154 £68Ó3 =1000

R15R

R167 68

'20V

380 VIDEO AMP. 0753 2SA506

4r 2SÁ663

VERT USC I

13451

'19V

m 5014

= F =X307

D

oD SERVICE

CI

RI64 1500 0151 eA H

LÌ51

R1121 ILC151 IOK 1TRA

GHr

1

LTJ

0 Ì5v 0110 FROM 1[301 0.655 Ì2K PIN 9

ARC 0755 2SC536

ISC945A

471ri

816 33008

-x-9V>P 11onz.

R251 10K R253

390K

R252

NOISE CANCELLER 0251 2SC536

or 2SC945A

C251 0 4 rnIT

0254 820 0257

10255 8200

RIM

'20V

SYNC. SEP. 0252 2SC536

or 2SC945A

F

2257E 4700 2258

3300

Ì7V 0.45V

07V

R260 D253

IS00K


*01.3,4 7c OUTPUT

VOLUME TRANS

V9903 II

1

C

D

E

F

G

AUDIO OUTPUT 0101 1501507

or 2501756

CHROMA AND APC

IC7 1

or LA 1768

6V

IR306 TO 11:30: 330 NR/t) =001 ;:310 =36 304

31 L 2K301C303 qyl I353MH: 0047 JOK 1

- iG]Ó2 ACñ LIF11

C209 33

6V1Ir

H1,r't

>M 8303 100 41im° 0óö417

330

R316 C]21 00 220

03014 yl

PHASE SPLITTER 0401 204564

or 254495

H MW

13402 6803 475

R4013,á01 21

1 700 1/51q

r

3v

m

U I 302

11 0 01

V11F20

304

03111

61 CFNT11; _

0 8811 HOrIr

1 5v111

a11 J e

-\.1i 6800 560

Cw02 0.01 0401

406 5K

Z401

}9404 SB20 0

03 0402 0404 001sT

94126.

56

Óp éT 8411 I 1500

840(1 07 '5600 ' 2 26lU

R4I0 12K

FORDt7 O1

VR401 30K 0411

131 1.210 1120V

HORIZ. OSC. I 0101 ISC576 h 2509454

0400096 1 0

640

0409

11

C428 C405 68 0015

EARPHONE JACK

SPEAKER

NFr._' 5o5"*"4 4401

`}I 3Vn II

I, H111J

Mee - "l'/ .4"455 ^11E

HOLD DOWN 0401 254912

. 2.549112

1421 8423 3100 IOK

15 1V

402

0403

0

HORIZ. DRIVE 0404 250983

or 2501921

7 12 V , p T'Hllrl

woof

11350 C351 22..11 001

i 1 TI

L3U!1

'120V

1342:

2700 6427

' 20V

R15+ 3900

TO MEMORY BOARD

[15A 1F-1 .1200

BLUE OUTPUT 0351 1501507

er 2501569 or 2501756

P8 ' 1353

PLUE 00354 BIAS 10K

C356 1013355 M 200

IRLUF DRIVE

HORIZ. OUTPUT 0405 25013088

or 15017580 or 15018944

C413 '470

1.-

843

R428 0 3900

J 1.-

RED OUTPUT 0353 2501507

or 2501569 er 2501756

0353 680

RED 00351 BIAS lOK

GREEN OUTPUT 0752 I5C1507

or 2501569 or 2501756

5V,

03 '181( Iy

f ¡

00

35,

5

'08353 200 ',GREEN l -_DRIVE

VERT. OSC.-1 0451 25A564

RIPPLE FILTER 0003 250536

et ISC945A

*I*1*1 *1 C436ÌC431ÌC436Ìf.439T C4161

* *'* f1 0431T 14 .T C433TC4341 1431 143DT

730V'111 Htlr'r

IBM

B5

+120V I OV

A010 500

1005 4ñl

VERT. OSC.-2 0452 250536

1403

C410

POWER REGULATOR 0901 2501108 or 250932 or 2501454

B3

REGULATOR DRIVE 0001 2S4564

or 254495

G015 RO

C008

ERROR DET. 0002 250536

or 2509454

1ST VERT. DRIVE 0453 250536

or 1509454

R464 0700

VERT VR451 HEIGHT 50K

046 820

0419

* 114713 4479 4)0 Vr

HO _ WIDTH

IGH'JOLITMENT y DJU3 7

IC<17

L405

S1

+20V * * Ell

L420 0407 9438

Y*4

+19V * I:111

C417 22/561

e

8465 68K

8004

MOOS 56K

15K

N007 110K

*0002

coo,*

*U>,2 1

E

z FILTER

C461 mlll

2ND VERT. DRIVE 0454 250536

2509454

466 113V 270

C467 047 13V ll1

/R4561 1 1C460 Z 0453

10 14 7331.1 >134'1 rIK

04 )0

18 5V

0r1' C463 12 1005,,1

55V

VERT l'.EN110

DO

6481 OK

0460 11Â4- e

I

1464 UP ^ 780Ó5

13J60 T0 ABL 50

BASÉ

7..` R<J6

IK

01

R002

POS 001 C2

AC FOSE 44

3120V

13 4)2

4

*SW901 0011 ON SWITCH FRONT PANEL,

AC 20V

SANYO Color TV Model 91082

TO MEMORY BOARD

I TO REMOTE CONTROL

{180 7I -J BOARD

CrCe n1.12oV H7

* AC INTERLD,

ADDITIONAL 120011 INFORMATION Ve NEXT PAGE

VR452 35 R473 2700

C462 y omen

10302 PIN 6 THROUGH 0165. L156

.120V

Wr R474 2200

D454

11465 T0021

U2,

VERT. OUTPUT -2 0903 250387A

120VI et 2504024

T3a

T1 D 55

64 ó GREEN

X310 VELLO

82

01

o BLUE

0.8Vp-p Vorl

Lonw.I

VERT. OUTPUT -1 0902 2503874

or 1501014

*L905 DEFLECTION YOKE

RED

rVERT.COIL R91U

1829 1

6911 4)0

11

HORII. COIL

I

407

'0 10302 R440 R166.Z

V 40T3.5

if C425

U

11 I

I

I

0903 IHORIZ 'OUT PUT!

5 .

I

6

3

o 2

II j>^ L-J

9

TO PHASE SPLITTER 0401 THROUGH 0405

113 IR10C1U31 -

NL 401

L354

F ROM B01JT L353

V3

1

S2 o-

R2á

00M R OUT L351 133 12C

R 1204 R12015pp

RI .e6 121,4e4

7 IWr

12C

6

er 3

R1205 R1202 12K 1500 M ' W

ROM G -DOIT L352 RlO 128 /

13120

' ..c

12

R1213...2Á

20VP-p

B R1206 1R Ó3 1

9 r10 12K

r.6 R121I 1 C1102

1500 / Cl O110 l000 00

MMXO.SVV 4100 T

C120 4.7m136

ABL 91212061202 e2)220 150K 100K

tC47

K

'AA !J D1201Z `470K0 4K20B4

'1204 40aV

270K SCREEN 0131201 IM

12E 12H

PICTURE TUBE SOCKET CIRCUIT BOARD

ANODE

PICTURE TUBE

510JVB22

12J

R908 C902

5901

CABINET CASE

COPYRIGHT 1870 ®Y ELECTºONPC TECHNICIANIP 1 ER r 11Á$T FINIT STREET DULUTH, MINNESOTA 55802

SANYO Color TV Model 91C82

MEMORY AND PRE-SEL,TUNING CIRCUIT

Related Terminals with channel

CHANNEL 2 3 4 5 6 7 8 9 10 11 12 13

TERMINALS 2,6,11 1,5,12 16,4,13 15,3,14 2,6,11 1,5,12 16,4,13 15,3,14 2,6,11 1,5,12 16,4,13 15,3,14

DEVICE IC1501 IC1502 IC1503

Ou IR,RMEL

5r_ I

bR .5E1.10,

-

LED CIRCUIT MEMORY CIRCUIT BOARD BOARD ire. .... ....... ......

_._-_ _.__. - _.__-

I --- - lllllllllll____ MEMOET ®m (CH7-CMI LIE

. BI

LI,SM I . RIS01 c1,50,

1.13150e

I I ,R1552 C1512

11602

71503

Te1w1

.1505

I N1505

--I I

C1642

R15,5 1527I 1515

PRE-SET TUNING CIRCUIT BOARD

("rowº 'S7e

SÉLÉérpR W5

"vRrSt]

Rí5]5

or eiD r. 1111111!

Mu BIM ENE IRMO

I R1545

0 ILI

PIA C>17

PIA CMS

RRA C1.I5

411

RI

SWo-_

ILI

R1555 öc

R,,5W,5 vR154]

`0',2 ; aa ._-- -um--

71507

1505

71510

I

i CISCO

;,- 618

r2 I 11511

1IR154,I]1

I R1510 .C1514

I I

R, =,572

MEMORY (CHI- CM IC,EN LIMI

Lá

mar- .,,12I

51515

R1525 C1523

5 _

MEMORY ICH,I-CHTA IClui llli-

áÉG

..

II - u*iriI©

_SI 4N J il wÉ

o0Ì4=

PSA

Sw15a WINS --

5545 R1

VIA C. P7S

LSÿ C

SW1541

R15,1 -.

1.58

CHB L70

PIRA CR11 Pl.

N1572 o---

R,572

RIPS

OR

TUNING ASS'Y

REMOTE CONTROL PULSE SHAPER 01501 01[5.1[ .. 01n1s.

SANO SWITCH MINI Uni,.

om .ilI

RI 10

Pl2A C.3 Pl.

R SE

Q _O®, ._._.__...._.-A. ?;8°a M_._MM.riM r le.l I

O

D1]

Q '

IFRON, VAIN SIGN, BOARD

ii

IJ1 u5

P1675 U 16

R 1575

-

12

3W1TLMe5 {UxiLY1NIRULS

27

o

TUNER

BAND SWITCH 501

LSL915.4

.J E

Meer .a


dA 5 áLL W m,-w w á 5§g8 ii Fw

io c4i 2apóm`cúp5 aH F f,pnzá¢ oiii`

<m wwigF¢á¢ ¢pp á OFYW U. II,IG.0 ¢ w

" 1

j

- - - - I g ¡ e e

4 e g a Yee 0 n Y! V2^ e j_/ i --i.

ú I$ s1J I 1 1 1 -o 6

5-

M g g gl$ bm I L .?á á ó

rcáY%%iäame g

°.2=8grcágligegM 14---j-" bN C ob-

m Q O

Ñ 171nx***#*x117c***

HÓaÓÓÓÓÓÓÓÓÓgi0 0000000000000000

re pM V

3o

rc '- O

oto =JM

F1

14

ó

Le,

g

U

N

cc

4 ¢

ADDITIONAL INFORMATION NEXT PAGE

-TRANSISTOR LAYOUT-

r ó¢íw- ó- _ 7c>- xU 31> *m

.W yy'¡ j +* Om O¢ OZ vF %r-- fK- m O= *ti

005{ xU «

mF mH Iñww ñ w ¢pp

11Yyyy1

QQ QQ QQ

pppp mF O¢>¢ F1?O> N1

t0 IJ l0 IOY Y *rct0 NI O O-= OZ J M O U

-Jrc Y y¿ ® r1S w ó p

m

¢® 1411

s =5. *3

Ñ

8 Y rn

LLryyryMir

NñN OQ

IL U OOHT _

gQH$

%-; me -d^ $4 ip>R Ó>-

11p_ 0 ^

e Q NV oóo 000 000 000 o o o

000 000 Y000 20000

ó

INRer

TUNER

NOOK -UP

19 1913

ETID4HAM COMPLETE MANUFACTURER'S CIRCUIT DIAGRAMS

ó

-TUNER CLUSTER/POWER SUPPLY-

T313K100 \ OIDKao

100/1,

N®KOA

i

CIII

E. 1010. i

e /O 105

109.

1016

10

IOL

aF rom l

AM)q..RE

_ J

- 11202 TENS

To L.

8 O J M ;ir

T 00

TO 11.311 TLIT

E--- ® ':z.

/ / T

;Po. \x

11200 ONES

r-6'211

TO TO TO ,L13

13

VAPACTOR

0

3CE

wo rt

141

..NC1011

JOEK1 -^

1".';n1 1 1t I

WIWO -; T,w N'

wi 01210

011200 1013.

DEO SOIMD MUTINO

TO

.1141

íM3

To

*0 . 3 c31150p Tw

r MEMORY 000ULE

11g ONES

COCO -A

TENS -E

104 -O

uP 0M -. EN 11 111...

.OUNC.

r11F.. .ANO w N41, ..

-I

... :4;,. : NR

001111

MN

TO TNIO

TO

ro i11H

OMS

3 \ TO

10

To T

1778 SYLVANIA Color TV Chassis E49-2

FEBRUARY 1979

r PART OF SECONDANY1 CONTROL MODULE

Y. 714 Tire

aw600 .1. 0,90111

Art 113.141 0111 Cr.

Gÿ 1

©

My O O

© o

L--- 91.111,

111222

m0 ONF2 0

T<ixu N

01202

10

AOC INVERT. L'F------10 33-3

2,0

111,90

-P000CAL LAYOUT. PLUGS/SOCNETS-

TUNING VOLTAGE CHART (MEMORY MODULE)

rW

r

ON KM 11EC

r.==a

1 1

1 1 noroF

1 IV

reen

EINTF.

, ®

(ALL IN DC VOLTS)

CH. 2 CH. 3 CH. 4 CH. 5 CH. 6 CH. 7 CH. 8 CH. 9 CH. 10' CH. 11 CH. 12 CH. 13 CH. 14 CH. 38 CH. 83

TL10 AFC 2.2 3.4 4.8 7.4 9.5 7.0 7.6 8.3 9.1 10.0 11.2 12.9 1.2 4.8 13.4

TL11 VHF TUN. VOLTS 3.5 5.6 7.8 12.1 15.5 11.4 12.4 13.5 14.7 16.3 18.3 21.0 2.0 7.9 21.9

TL12 UHF TUN. VOLTS 3.6 5.7 8.0 12.3 15.9 11,6 12.6 13.8 15.1 16.6 18.7 21.5 2.1 8.1 22.4

TL16 BANDSWITCH -3.4 -4.0 -4.4 A.6 4.6 24.3 24.4 24.4 24.4 24.3 24.1 24,4 24.2 24.2 24.2

L

NOTE: Voltages shown are average readings. Local broadcast used as signal source. AFC Switch - OFF.


SYLVANIA Color TV Chassis E49-2

O 1.5 VPP Horiz.

1.4 VPP Horiz. 1

.8 VPP 1.1 VPP 1.4 VPP 28 Horiz. Horiz. Horiz.

53 1.12 VPP Vert.

2

15

32 VPP 55

5.6 VPP Vert. - Vert.

0212

1áF2WAMR i

ivl

0218 Tk AFC OVERRIDE

30

1.8 VPP Horiz.

..

+ p 111+ yid 1

1.6 VPP 1.7 VPP O 8.7 VPP O 6 VPP 6 VPP O 4.8 VPP 3.6 VPP 11 4.9 VPP

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COPYRIGHT 1979 BY ELECTRONIC TECHNICIAN/DEALER 9 1 EAST FIRST STREET, DULUTH, MINNESOTA 55802

1779 SONY B & W TV Model TV970

FEBRUARY 1979

120V AC

60Hz

ORG

RED

L (___J PED

7901 PT

L

ANT

IT» TMEM COMPLETE MANUFACTURERS CIRCUIT DIAGRAMS

> 'r, :9 - ï -- :.;;:;?..':±::f.'+.:.l.5::::: . 9ïállfl tn.::¡: :

Note: The components identified by shading are critical for safety. Replace only with part number specified. '>

ll S101d-

ro-, ca r. VHF 8 EXT

30011 ,AAP- L.O_ od .)01

UHF c- o-

CV 20' 5p

C202 3(

GRY

2OrV

}

ORG.

YE

C201 4p

I

{L101 o IyH

TI

VHF TUNER y RF (BT-447WU) 0úT CÌ0

oulolN AGC IN B+IN 0iß rJTj, FC101 0/1611 c,VZ

471611Z -0- AGC

UlF OUT B+

re UHF TUNER INS

1IN (81-264) o

S102

ORG

YEL

10.5mA

L102

(00y

8+

ORG

GRY

A A -1290-084-A

L203 1 ° 41.25MHz I a

TRAP r 7201

VIFT_I R6

L20( 47.25MHz.-

TRAP

R202 12

0206 2SA733 RF AGC

Cz39 33/16V

R231

7.4V R82 19.2V0 (9.6V1

10206 + 2.5V II,IVI

0604

WHT

0.0047

R233 18k

T'

X022

39.7 MHz T

Q 201 2 SC 1129

Ist VIF

R205 270

1-C207 ;0.0022

0201

920 220

i Th20I S-90

R230

RV 201 470

R232 680

D601

0.0047

LJ C605 2200 25V

D601^D604 SIB01-02

AC RECT

1

R601 2.2M (I/2W)

F601Q I PA a

e/.e

I4èC1

47k

C209 00022

5202 8207 2SCI128 560 240 VIF v%

R206 t42%4.91 2k

:C:(088\1)

C243 00022

r - 022' . / 10.9V 2 C210 8209

47p ''' *3.3k1

R204 f

390 tm " 0212 0.0022

R2R37

Note:

1. All capacitors are in µF unless otherwise noted. pF = µµF 50 WV or less are not indicated except for electrolytics.

2. All resistors are in ohms, 4W unless otherwise noted. kU2 = 1000 Cl, M12 = 1000 652

3. A : internal component.

4. * : selected to yield optimum performance.

5. : nonflammable resistor.

This set is equipped with a polarized AC power cord plug (one bladeof o e the plug is wider than the other/. When replacing the AC power cord, be sure to use it having the specified part number and connect it as shown in this diagram.

C241 0.04'

R238 I

C230 001

C231 330/16V «II 1GV

47/ C23ó5011

C234 . {F001

'5,2V 0.3V f.

M DET

IC201 CX095 SIF DET, AF DRIVE

0.6V

IC201

AF DRIVE 111

1

©,3.G

R245 680

3.74 L .1.tV el, 6115.7v rj 4.6V1 1 71l T C233

ç2p8 ! I C237

- 1 0.01 10.0022

T203 SIFT -1 77))rr

47k a.

6. : panel designation. : adjustment for repair.

7. Voltages are measured from chassis to point indicated by using a VOM (20 kS-2/V).

Readings in ( I: taken with no signal input

(BRT control . MAX i CONTR control MIN á

Voltage variations may be noted due to normal production tolerances. I

8. 0 : S901 is ganged to R V901.

9. All variable and adjustable resistors have characteristic curve B, unless otherwise noted.

10. 5102 is mounted on VHF tuner.

11. O: adjustable without removing cabinet.

It 3

8240 RN2 ®V901 1

¡ M YEL

SOk-A

+ C232 '4. El!0.0022

WH

24 C245

470 T0.0022

0203 2SC403Ç 3rd VIF b .8V

OU 9211 L205 8.2k

1 10V

HC21a 0211

%ºP.9V R212 C213 l8k 47p

T I R209

180

0202 SI555 0205 2SA733 AGC GATE VIF AGC

C216 0.0022

D201 11261 o.e 0204 2SC403C

VIDEO DET VIDEO DRIVE

T202 L211 2.2 pH VIFT-4 -

10201 I

_ I IC218 = I L206

IOp 1 8.2 10.5`--- 0.0022 - J TT 4707

Sp0221 97

R235

YI 0219

áók 680

71716V 71l

ì2Ó 0217

00022 Ii

C244 0.0022

R218 4.7k

4.2

7.8V (74V)

R2t5 I

5.66

C2

L209 1

4.5MHz '- TRAP

6219 330

f1 CF201 C228- 22p

0204 3.6VI

L208 IyH ' 20

390

J

C227J_ R223

0.00 390

R227 2.7k M 0725 T

R225 820

D202

14

C224 / .5V1

tJ 0.022

C226 8278 R210pV9 i H226

22 16V tnr

'Ok re 126114)

_-0,r0S901(A) VIO IPOWERoS901(81

BRN

D605

R a

1S1555

Q601 2SC634A

REeIVE It I.8V

SPOT KILLER =0605

6. 6ß(3603W;

F6025

0602

.412.5V

0601

_ R602 I 13.1 v

C60T 3.3

0.0022

BAIT oQoo 0602 2SD291--- -

PEG OUT

C

'°5°v 2

603

R604 3.3k

RV601 \22k.

0.6V" R606

120

0603 8605

SC945'2° REG DET

Th 601 S-300

°e

AV"

0205 4124222

Ye y Ik en

8926 R 01 II.4V

'-°.3V)V) 3.36 220

R224 - 56k ,,,,,......47%%:**,\ OOP

# IÓÓp 3503 ? 1 I,2Vp- DIV1 3306 71f7

R502

'1.2Vp-p00 0519

0.033/10011 C501 1/50V

e 22k

0501 2SA733 SYNC SEP C502

7410.5V 16470 V

0501 .2V

8505 568 ©.7Vp-pIV)

R243 12k R241

680

P^

D451 151555 AF BIAS -I

10:8_4207 2SC634A I Lev 1 SUB FILTER

0207

10220 ¡, 0.0022

C240

41eX220n6V RV402

I4Vp-p;H)

1]

39D 045F1

2RSC634A w 0452 2SC634A C451 1 AF OUT -I

7SV BV

7VC458 YC4571

R455 0022T t?6o 820 r IOOV tir+

220 R458 C C455 2.711W) 220./KA

R452: 330'

C453 . 33/16V

L.

C452 4.7175V

9454 6.8«

100Á6V

R456 0452

0451

R453 24k

C7

1.4V

T

C408 100/ 6.3V

D552 1S1555 V BL

D552 M

8244 # 820

`V

250k

IBRTI

RV401 500

R414 220

IC ONT RI

R410 68

R408 10k

BLU

R459 I2.7

6.3V 6.9v

0451

C456 0.022

100V

0453 R461.=

10

0,9V -' R457 0453 2SÁ678 301 AF OUT -2

GRY/ WHT

GRY

C406 1

WHT EJ 901

GRY

R460 270

GRN

04011 2SC403C ó 403C VIC409

1/160yí

R406 R1503

5k

00 L401

R401 330uH

240k 2V12.2V1 11

C401 10/16V:

8402 8k ww

C

R409 200k

16K1140 270k

WAY

YEL SP901 320.

a

C405 0401 011100V 461.7VU.7V)

R40 560

R405 150

R413

47k (1/2W) W._

/13) 55Vp-p(H) 114V1>

R411

22k 11/24) 6.17 kt

4 ) Ì ii' V901

o_ro2308X84

1 1ro2 6.3V

SG401

TC4o4 0407 0.001 I/160V

3

6569 220

y C809 ¡ 470p

---1]

0- - --o RED

Ove,5 1412 # IOk

(1/2W1

1

VIO

R552 3.9k R551 6.8

1 M NA

I 0552 I1

0551

7m 100V7 0.033

771 100V

(7-")0.5'..

0551 0552 0551,553 11.8V 2SC945 ! 2SC634A IS1555

Y V OSO , AR,: V BIAS I 554 IRV55 R559

4 100r16V Ok 0 '

RV551 R554 3.3k`.

0553 0554 2SC1474 V OUT- I

2SA772 V OUT -2

;60mÁ

WHOLE)!

C553 0551

047/50V R556 22

0.0 y u 555 0556 Ó/16V 33!16V

WERFA

R555 12k

C558 33/16V

4557

R558 1k e

-411.8V i

h1 65 / 111W i C561

R560 20kpp

5.5/V 0.6v

VP NW

0502 2SC945 0055812 IATF2C2A

SYNC SPLIT

R5I2 2.2k

C508

50V

0504 0503i2SC945 11.8V 2SC945

R518 3 R.52 11 447

R5I4 470 6,8k 50.0033 *R525 12W) 390 R522 c'

100V 470

C5I3 22040502 "'7 515 0.0022 4.2r1H.- 0A7 100V

GRY

568

C562

I L901

DY V

v

R508 6511 ,R513

470 0.01/100V

0505

H DRIVE

6.8V

VO6C MVRECT

4 II

20k

v7 R100570:62,8

15k

R507:

/ 100V

22k

7117 R523 8.2v

C51(31 - 220p

8515 6.8k

0.0047

T501 HOT

8

2.711W) -0.7V

, R802

000 500V

9.66V at 90yA

8803 8.2k

BOOST

al50Vp-p11-0 T801 ru

/50V 11

0503 4.3V 0504 r520 I 470p

01

*R51).9 91521 C516 0801

__, ..

k 0. 0801 0 744

2SC756

Yer

2

IMF -15

VO6C DAMPER

j.0334 0.022/200V

13804


BLU

L901 DYR

RED

Let's face it. The longer a set sits in your ship, the less profit you make. And call backs hurt even more. If you have to work on a set again because a replacement part fa ed, your profit is gone Maybe even your customer.

We've been working with technicians for years to help solve these problems. So when you orcer WEP semiconductors, we make you two s mple promises:

1. No back orders. Your

distributor won't do that to you, because we won't do it to him. And ycu I get sets out faster.

2. Fewer call backs When you install WEP semiconductors, you're installing the best quality parts available. We know they're gooc, so we promise you fewer pa rt- failure related calf backs with WE?

In addition you get great margins, and complete

technical inforrration on every package.

Next tine you need semiconductos, o ary replacement pats, ask for WEP/Workman. You'll most likely end up with a few less sets "waiting on parts," and a few more happy cJstomers.

Your business card or letterhead will bring immediate response frcm one cf our represen-artiees.

P.O. box 3823 Sarasota, Fla. 335Th

TWX 81C-864-0401 EWC1QNR(OMDUCAINnC813-1-7`-4242

Sem Icor d Jctors From Tie Par sSpecialists

WEP REPLACEMENT SEMICONDUCTORS:

THEY HELP YOU TURN lOBS AROUND FASTER.

AND KEEP THEM TURNED AROUND.

Circle Na 103 on

Reader Incciry Card

WAITMS ON STS

Models 310 and 310-C... hand -size testers with ADD-ON versatility.

1J

yqNNIVEP

z bi`s'on performance, the drop -resistant Model 310 VOM with high impact thermoplastic case is a

boon to field servicemen, as well as circuit designers, technicians, electrical maintenance engineers, and the price is right on for vocational and hobby use.

MODEL 310 (with 18 ranges) ... Only $60. 1. Drop -resistant, hand -size VOM with high impact

thermoplastic case. 2. 20,000 Ohms per volt DC and 5,000 Ohms per volt AC;

diode overload protection with fused R x 1 Ohms range. 3. Single range switch; direct reading AC Amp range to

facilitate clamp -on AC Ammeter usage.

MODEL 310-C (with 18 ranges) ... Only $77. MODEL 310-C offers the same features, compactness and size as the Model 310 plus a self -shielded, diode overload - protected suspension movement, a DC polarity reversing switch, a single enclosed range switch, and 15K Ohms per volt AC sensitivity. Versatility of the Model 310 and 310-C increases with the use of optional accessories like the Model 10/10-C clamp -on ammeter and the Model 101 line separator. They both come complete with 42" leads, insulated screw -on alligator clips, batteries and instruction manual.

For a demonstration, contact your Triplett distributor, Mod Center or representative. Triplett Corporation, Bluffton, Ohio 45817. (419) 358-5015, TWX (810) 490-2400.

Triplett performance... a tough act to follow

11TTRIPLETT ...Circle No. 104 for information

...Circle No. 105 for demonstration

Documents

Quasar's supersmall chassis - WorldRadioHistory.Com...SPRINGFIELD, MA Westfield, MA 01085 300 Union St., P.O. 238 413-562-5205 PHILADELPHIA Upper Darby, PA 19082 742-44 State Rd