HP Archive

This vintage Hewlett Packard document was preserved and distributed by

www. hparchive.com Please visit us on the web !

On-line curator: Glenn Robb

This document is for FREE distribution only!

INSTRUCTION AND OPERATING MANUAL

FOR

MODEL 335E

TV MONITOR

Serial -Jj:£

HEWLETT-PACKARD COMPANY395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U. S. A.

t.r,,'

General Description

The Model 335E Television Monitor is designed to give a continuousindication of the frequency deviation of the aural and video transmitters and themodulation percentage of the aural transmitter of a TV station. The frequencyrange of this instrument covers all TV channels, 2 to 83.

The Model 335E also includes a peak modulation indicator which may beset to give a warning when the modulation exceeds any pre-determined valuebetween 50% and 120%. Provision has been made for the operation of remoteindicating meters as well as a remote peak modulation indicator. An audio out­put voltage is also available for measurement purposes.

CAUTION

READ THE INSTALLATION AND OPERATING INSTRUCTIONS CAREFULLYBEFORE ATTEMPTING TO USE THIS INSTRUMENT.

Parts Substitutions

Difficultie s in procuring some of the parts used in this instrument maycause the electrical or physical values to deviate from those shown in this in­struction manual. These substitutions have been made so as not to impair theperformance of this instrument. Whenever replacement of any of the se parts isnecessary, either the substitute value or the original value may be used.

INSTRUCTIONS

MODEL 335E

TV MONITOR

Specifications

Carrier Frequency Range

Channels 2 - 83 inclusive, including offset channels.

This instrument, Serial 15 ,is adjusted for the following carrierfrequency. --~-----

Channel

12

Offset

10ke

Aural Carrier Frequency

209.76

Master OscillatorCrystal Frequency

26.2012$0

Visual Carrier Frequency

205.26

Visual Frequency Monitor

Deviation Range - !l. 5 Kc from assigned frequency.Accuracy - Better than !500 cycles/second for at least a 10 day period.

Aural Frequency Monitor --

Deviation Range - ±6 Kc from assigned frequency.Accuracy - Better than !l. 000 cycles/second for at least a 10 day period.

Aural Modulation Meter

Range - 0-1330/0, Meter indicate s 1000/0 on a 25 Kc swing and 1330/0 for a33.3 Kc swin*.

Accuracy - Within _50/0 over entire scale.Indicating Meter Characteristics - Meter damped in accordance with F. C. Co

requirements.Frequency Response - Flat within !1/2 db from 50 to 15,000 cycles/second.

Peak Modulation Indicator --

Adjustable to indicate modulation in excess of any predetermined per­centage between 50% and 120%.

Audio Output --

Frequency Range ~ 50 to 15,000 cps. Response flat within !1 /2 db. Equip­ped with standard 75 microsecond de -emphasis circuit.

-1-

Distortion - Less than. 250/0 at 1000/0 m.odu1ation.Output Voltage - 10 volts into 100,000 ohm.s at 1000/0 m.odulation at low

frequencie s.Monitoring Output - 1 m.illiwatt into 600 ohm.s, balanced, at 1000/0 m.odu­

lation, at low frequencie s.Residual Noise - At least 60 db below output level corresponding to 1000/0

m.odulation at low frequencies.

R. F. Power Required --

Visual and aural carriers each require less than 1 watt.

External Meter Term.inals --

Term.inals are provided for connecting external m.eters (aural and visualdeviation. aural m.odulation) and a peak m.odulation indicator lam.p to the instrum.ent.

Power Supply Rating -­

Voltage - 115 voltsFrequency - 50/60 cycles/secondWattage - 180 watts

Accessories Furnished

Cables -

Type of Cable

Power 3 cond. rubbercovered

Connector s -

Length

7-1/2 ft.

Term.inations

Motor base plug oneend - 2 prong plugother end.

12-1/4" high x 19" wide x 15" deep.

Weight --

60 pounds.

Type

UG21B/U

Overall Dim.ensions

QUcantity Furnished

2

-2-

Operating Instructions

Inspection --

This instrument has been thoroughly tested and inspected before beingshipped and is ready for use when received.

After the instrument is unpacked, it should be carefully inspected fordamage received in transit. If any shipping damage is found, follow the procedureoutlined in the "Claim for Damage in Shipment" section on the last page of thisinstruction book.

Controls and Terminals

CRYSTAL TEMPERATURE - This thermometer indicates the temperatureof the master oscillator crystal oven.

PEAK MODULATION INDICATOR - This red indicator lamp lights when­ever the aural modulation percentage exceeds any pre -determined value between50% and 120%.

50% - 120% - This control is provided to set the modulation percentageabove which the PEAK MODULATION INDICATOR lamp will be lighted.

A - The VISUAL CARRIER DEVIATION meter pointer is set to zero withthis control. (See Maintenance Section).

B - This control is used to adjust the VISUAL CARRIER DEVIATION metercalibration. (See Maintenance Section).

CRYSTAL TUNING - This variable capacitor is provided to adjust themaster oscillator crystal frequency.

J1 - The phone jack labeled J1 is provided so that an audio voltage maybe applrea to the visual amplifier and counter circuit for the purpose of cali­brating the VISUAL CARRIER DEVIATION meter.

TEST - This pushbutton is provided so that a simple test may be madeto determine whether or not the visual carrier has deviated 7 Kc and thereforeis producing a false zero indication on the VISUAL CARRIER DEVIATION meter.

CARRIER LEVEL ---CALIBRATE - The function of this switch is toconnect the circuits and meters in the various combinations required to monitorthe aural and visual transmitters, check on the performance of the instrument,and to determine if an adequate carrier level is available to operate the instrument.Listed below are the switch positions and the functions performed at each position.

CARRIER LEVEL - In this position the VISUAL CARRIER DEVIATIONmeter and AURAL CARRIER DEVIATION meter areconnected to measure the level of their re spectivecarriers. The AURAL CARRIER MODULATION meterdoe s not function with the switch in this position.

-3-

1 - The AURAL CARRIER MODULATION meter measures the gridcurrent of the first multiplier when the switch is set to position 1.The other two meters measure the grid current of their respectivemixers.

USE - In this position the instrument is connected to monitor the tele­vision transmitter.

2 - This position of the switch connects the VISUAL CARRIER DEVIATIONmeter so as to measure the grid current of the 4.3535 Mc crystaloscillator. The AURAL CARRIER DEVIATION meter and the AURALCARRIER MODULATION meter indications have no significance.

CALIBRATE - In this position the VISUAL CARRIER DEVIATION meteris used to measure the grid current of the 150 Kc oscillator.The AURAL CARRIER MODULATION meter and the AURALCARRIER DEVIATION meter are connected so that theircalibrations may be adjusted by the controls C and DrespectIvely.

POWER - This switch con rols all power supplied to the instrument withthe exception of the crystal oven heater circuits. The crystal oven circuits areenergized at all times for maximum stability.

FUSE - The fuseholder, located on the control panel, contains a 3.2 amperecartridge fuse. To replace the fuse, unscrew the fuseholder cap, remove theblown fuse, and replace with a new fuse of the "Slo-blo" type as speCified in theReplaceable Parts Table.

C - This control is used 0 adjust the AURAL CARRIER DEVIATION meterpointer to zero. (See Maintenance Sec ion).

D - This control is used to set the AURAL MODULATION meter to 1000/0.(See Maintenance Section).

MODULATION POLARITY - The pOSition of this switch indicates thepolarity of the modulation indica ed by the AURAL CARRIER MODULA TION meter.

EXTERNAL METERSAURAL-MOD-VISUAL - These three coaxial jacks (J4 p J6 p J7) are pro­

vided for connecting external meters to the instrument. Whenever external metersare not connected to the terminals p the d mmy meter loads furni etl with theinstrument must be connected. The du:rn.my meter loads are 3000 ohms eachfor the AURAL and VIsuAL terminals and 1000 ohms for the MOD. terminal.

1 - 8 -- The terminals on this terminal board are identified as follows~

Low Z (l and 2) - - Low impedance audio output terminal for monitori:;'1.gpurposes. Terminals 3 and 4 must be tied together toobtain the audio voltage at terminals 1 and 2. One milli­watt into 600 ohms, balancedp at 100% modulation at lowfrequencies is available across terminals 1 and 2. Thisoutput is equipped wi h a standard 75 microsecond de­emphasis circuit.

-4-

-­'.'1

~-

-$\'.::l,

33

5£

1/2

2/5

4S

eri

al.

1an

dA

bo

ve

""l'I

+

Jt

o<lr

-to

...

Fig

.1

.M

od

el

33

5£

TV

Mo

nit

or

(Pan

el

Do

or

Op

en)

R271RI37

METE R LOADS

.- UG21 B/U ---.CONNECTORS •

DUMMY

R247

Fig. 2. Accessories Furnished with Model 335E

~

>o

HI-Z (4 and 5) -- Ten volts into lOa, 000 ohms at 100% modulation at lowfrequencies. This output is equipped with a standard 75microsecond de -emphasis circuit.

6 -- This terminal is provided for connecting test equipmentto the instrument for calibrating the AURAL CARRIERMODULATION meter. The IF frequency may also bemeasured at this terminal.

Lamp (7 and 8)-- An external peak modulation indicator lamp can be con­nected to these terminals. A 120 volt, 3 or 6 watt lampshould be used.

FUSE - 1/2 AMP. - The fuseholder. located on the back of the instru­ment, contains 1/2 ampere cartridge fuse. To replace the fuse, unscrew thefuseholder cap, remove the blown fuse, and replace with a new fuse of thesame type.

This fuse protects the crystal oven heater circuit.

J5 - This jack provides a connection for measuring the spurious ampli­tude modUlation on the aural carrier.

RF INPUTS -

AURAL - This coaxial connector is the input terminal for thecoaxial cable from the aural transmitter.

VISUAL - This coaxial connector is the input terminal for thecoaxial cable from the video transmitter.

Power Cable - This is a special three conductor cable with a standardtwo prong male plug molded on one end and a two contact motor base plug onthe other end. The third conductor (green) protrude s from the power cablenear each plug and may be used to connect the instrument chassis to an externalground.

Ins tallati on

The Model 335E Television Monitor is designed to be mounted in astandard relay rack. FQr dependable operation the monitor should be installedin a well ventilated rack where the air temperature does not exceed 113 0 F (45 0 C.).It is also important to leave clearance behind the unit to allow adequate passageof air through the air filte.r in the. back of the dust cover.

External meters and an external peak modulation indicator lamp assemblymay be purchased from the Hewlett-Packard Company. Write the factory if youdesire any of these accessories.

All connections to the monitor should be made with shielded cable withthe exception of the power cord and the wiring for the external peak modulationindicator. Both RF inputs and the external meter connections should be madewith coaxial cable, the audio output connections should be made with doubleconductor shielded wire.

-5-

Coaxial Cables and Connectors --

Function Cable Connector

RF INPUTS

EXTERNALMETERS

RG-9/U. RG-S/U, RG-9A/U, RG -lO/U

RG-55/U, RG-5S/U

RG-55/U

CAUTION

UG-21B /U, UG-21D /U

UG-536/U

Do not attempt to adjust the CRYSTAL TUNING control until the instru­ment has been completely Installed and connected to the power line for a continuousperiod of 24 hours.

When coupling the monitor to the transmitter never couple exceSSIve powerinto the monitor. A fraction of one watt is all the RF power required by t e moni­tor from each transmitter. ExcessIve input may permanently damage the RFsection of the instrument.

When installing the monitor follow the step by step procedure outlinedbelow. The instrument has been thoroughly tested before shipment and shouldrequire only minor adjustments during installation.

Initial Installation Procedure --

1. Connect the Instrument to the power line (115 volt ± 100/0. 50/60'\) andallow it to warm up for at least one hour. Watch the CRYST AL TEMPERATUREthermometer during this warm-up; it should not exceed 6S oC (outside green sector).If the CRYSTAL TEMPERATURE rIses above 6S oC. it indicates that the unitshould be disconnected from the power line and the mercury thermostat in thecrystal oven renloved and exanlined. In most cases the thernlos\cat can be restore.ito correct operation by repeated heating and cooling. This will unite the mercurycolumn and the unit will operate properly. See the Maintenance section of thismanual for the complete crystal oven serVIce procedure.

2. Connect the dUnlmy meter loads (three are provided with each instru­ment) to the EXTERNAL METER Jacks on the rear of the instrument. The 1 Oliohm load should be connected to the MOD. jack and the 3000 ohm 1 ads connectedto the A URAL and VISUAL Jacks.

3. Set the Function Selector (behind the door on the panel) to the CALI­BRATE position. Adjust control"C" until the AURAL CARRIER DEVIATIONmeter indicates exactly zero. Adjust control"D" until the PERCENT MODULA­TION meter indicates exactly 100%. These controls adjust the aural cc'~ t.ercircuits for correct operation.

-6-

. I

", .

CC'"t,.,.p'-.....

~

>­o~.

]<d-

4. This step requires an external audio osclllator such as the Hewlett­Packard Mdtlel 200AB or Model 200CD. Set the F unction Selector to the USEposition. Adjust the oscillator for approximately one volt output at...l5..Q.Q. cycles/sec. and connect it to J 1 on the panel. Adjust control" A" until the VISUALCARRIER DEVIATION meter indicates exactly zero. Set the audio oscillatorfor one volt output at 5000/sec. and adjust control "B" until the VISUALCARRIER DEVIATION meter indicates exactly +1. 5 Kc. Change the oscillatoroutput to 1Q.Q.P cycles/sec., the VISUAL DEVIATION meter should indicate-1.5 Kc. If it does not, re-adjust control "B" until equal accuracy is obtainedat both ends of the deviation meter range. The VISUAL CARRIER DEVIATIONmeter circuits are now calibrated.

5. Set the Function Selector switch to the" 1" position. The VISUALCARRIER DEVIATION meter should indicate at least +.5 Kc (RF inputs notconnected), and the AURAL CARRIER DEVIATION meter should indicate at·least +2 Kc. If they do not, refer to the Maintenance section of this manual.

6. Set the Function Selector switch to the" 2" position. The VISUALCARRIER DEVIATION meter should indicate at least +.5 Kc., if it does not,refer to the Maintenance section of this manual.

7. Set the Function Selector switch to the CARRIER LEVEL position.Connect the VISUAL RF INPUT to the sampling probe in the visual transmitterand adjust the probe until the VISUAL CARRIER DEVIATION meter indicatesbetween +.5 and +1. 5 Kc o (No visual modulation should be applied to the visualtransmitter, other than synchronizing pulses; 1. e., the visual transmitter shouldbe transmitting a "black" level.) Connect the AURAL RF INPUT to the samplingprobe in the aural transmitter and adjust this probe until the AURAL CARRIERDEVIATION meter indicates between +2 and +6 Kc.

8. Switch to the USE position. Press the TEST switch; the VISUALCARRIER DEVIATION meter indication should increase (deflect to the right)between 100 '\, and 1 Kc. This indicates that the monitor is properly tuned forthe channel involved. If this indication is not obtained, refer to the Maintenancesection of this manual.

9. The remaining connections should be made at the rear of the instru­ment as follows:

External Meters - Remove the dummy meter loads and connect theexternal meters to their appropriate Jacks.

External Peak Modulation Indicator - An external indicator may be con­nected to terminals 7 and 8 on the back of the instrument. A 120volt, 3 or 6 watt lamp should be used for this purpose.

Audio Output - 600 ohms balanced output, connect to terminals 1 and 2and jumper terminals 3 and 4. High impedance unbalanced output,connect to termlnals 4 and 5 (gnd. ) and remove any connectionbetween termlnals 3 and 4.

10. With the exception of the final crystal oscillator adjustment, theinstrument is now ready for use. Do not attempt to adjust the CRYST AL TUNING

-7-

control until the instruTIlent has been connected to the power line for a continuousperiod:.of 24 hours and the POWER switch has been on at least one hour. Followthe Crystal Oscillator AdjustTIlent Procedure when TIlaking any adjustnlent of theCRYSTAL TUNING control.

During norTIlal operation of the instruTIlent the Function Selector switchis left in the USE position.

Crystal Oscillator Adjustnlent Procedure

The CRYSTAL TUNING control should not be adjusted without consultingan approved TIlonitoring service. No adJustTIlents should be atteTIlpted until theunit has been connected to the power line (crystal oven operating) for a continuousperiod of 24 hours and the cOTIlplete instruTIlent turned on for at least one hour.

The best TIlethod of adjusting the CRYSTAL TUNING control requirestelephone contact with the standard TIlonitoring service. Adjust the CRYSTALTUNING control until the VISUAL CARRIER DEVIATION TIleter correspondsexactly with the report given by the TIlonitoring service. The AURAL CARRIERDEVIATION TIleter should then agree very closely with the report of the TIlonitoringservice.

A secondary TIlethod of correcting the frequency TIlonitor is used whendirect contact with the TIlonitoring serVlce is lTIlpracticaL When the TIlonitoringservice report is received. check the transTIlitter log for the day and tiTIle theTIleasureTIlent was TIlade. If the TIlonitoring service report indicates the visualtranSTIlitter was 500 cycles high and the log indicates the visual transTIlitter was300 cycles high at the saTIle tiTIle. the indication is that the Model 335E was inerror by 200 cycles. To correct this adjust the CRYSTAL TUNING to raisethe present VISUAL CARRIER DEVIATION indication by 200 cycles.

Daily Operating Procedure --

L Turn the POWER switch on at least 30 TIlinutes before air UTIle.

Before the tranSTIlitter carriers are put on the air -

2. Check the CRYSTAL TEMPERATURE. it should be 65 0 C ±3° (insidegreen sector).

3. Set the Function Selector to the CALIBRATE position. The AURALCARRIER DEVIATION TIleter should indicate exactly zero. if not adjust "C".The PERCENT MODULATION TIleter should indicate exactly 100%, if not adjust"D" .

4. Set the Function Selector switch to the "2" position. The VISUALCARRIER DEVIATION TIleter should indicate at least +.5 Kc.

5. Set the Funchon Selector to the "I" position. The VISUAL CARRIERDEVIATION TIleter should indicate at least +.5 Kc and the AURAL CARRIERDEVIATION TIleter should indlcate at least +2 Kc.

-8-

• I

U"l­NN­.-4

;;

After the transmitter carriers are on the air -

6. Set the Function Selector on CARRIER LEVEL. The VISUAL CARRIERDEVIATION meter should indicate between +. 5 and +1. 5 Kc., when the Visualtransmitter is transmitting no visual modulation, i. e., a flblack" level. Visualmodulation will produce a lower indication. The AURAL CARRIER DEVIATIONmeter should indicate between +2 and +6 Kc.

7. Set Function Selector to USE position.

-9-

Circuit Description

The arrangement and functions of the various circuits which comprisethe Model 335E TV Momtor are outlined by the block diagram shown in Fig. 3.The transmitter aural and visual carrier frequencies are separately combinedwith an accurately controlled frequency derived from a crystal - controlledoscillator in the instrument.

A frequency difference of 150 kc plus or minus the modulation componentsappear at the output of the aural mixer. The mean frequency of the aural channelis measured by frequency counting circui s. The frequency counter circuits alsodemodulate the signal. From this demodulated signal the percent of modulationis measured. Audio voltages are provided for measurem.ent of distortion and fre­quency response characteristics of the transmitter. Provisions are also availablefor connecting external modulation meters in series wi h the internal meter.

A frequency dIfference of 4.35 Mc appears at the output of the visual mixerwhen the carrier is on assigned frequency. ThIS output is mixed with a 4.3535 Mccrystal controlled oscillator producing a 3.5 kc output frequency. This output ispassed through a filter that removes the 15,750 cps horizontall·ne frequency com­ponents in order to avoid the possibility of interaction of this frequency with thevisual deviation circuit. The output waveform is squared and the frequency ismeasured by the frequency counting circuits.

Detailed De scription of Circuits --

Tube VI is the crystal oscillator tube which generates the basic frequencywith which the transmitter frequencies are compared. The crystal is mounted inan oven whose temperature is regula ed by means of a mercury column thermo­stat. The characteristics of this oven are such that the temperature at the crystalvaries by considerably less than 1 degree C as a function of time and over an am­bIent range from +lOoC to +45 0 C.

This master oscillator is a cathode coupled two-stage circuit operating inthe 19 to 28 - megacycle region. It has been selected because it allows series ­resonant operation of the crystal. The arrangement has the advantage that straycapacIties has less effect on the operating frequency than in the case of parallel ­resonant crystal operation. A small capacitance C-l02 permits adjustment of theoscillator1s frequency. _

This master oscillator drives a tuned multiplier V2 which feeds into theseparate multipliers for the visual (V3A) and aural (V5A) channel of the monitor.

V3A is the vIsual mixer tube. A sIgnal from the viS1ual transmitter isapplied directly to the cathode of V3B. This input impedance matches the im­pedance of the 50 ohm cable from the visual output of the ransmitter. The gridof V3B is driven by the output voltage from the visual frequency multiplier. Thissignal combines with the signal from the transmitter to giv~ a difference frequencyof 4.35 mc in the plate CIrcuit of V3B. The 4.35 mc output of the first visualmixer is then mixed with the output of a 4.3535 mc crystal c ntrolled oscillator.The oscillator (V4B) is cathode coupled to the mixer tube V4A.

The output of V4A is the 3.5 kc dIfference frequency. This output ispassed through a filter whi h removes the 15,750 cps hOrIzontal hne frequency

-10-

.....

I5

0-

~

3:,~E

1/2

2/5

4S

eri

al

1an

dab

ov

e

1-'-'-'-'-'-'-

!R

FIN

PU

T-_

._

._

._

._

._

._

.-

....

.._

._

.

IA

UR

AL

CA

RR

IER

I_

._

---,

·I

I. I

•I

PU

LSE

.._-_

.+-_

.-A

UR

AL

15

0K

CS

QU

AR

ING~

AM

PLI

FIE

RC

OU

NT

ING

MIX

ER

KC

DIS

CR

IMIN

ATO

R

iV

5B

V6

,V7

,VB

V9

VI2

~S

UP

PLY

I I15

0K

CA

MP

LIF

IER

._._

.-A

UR

AL

CH

EC

K~._._

..........

.._._

.-A

ND

MU

LT

IPL

IER

OS

CIL

LA

TO

RI

RE

CT

IFIE

RV

5AV

4B

iV

IOV

II,V

I7

MA

STE

Ri

I,

XT

AL

t---

-M

UL

TIP

LIE

Ri

OS

CIL

LAT

OR V

IV

2i

!4

,35

35

MC

i_

IV

ISU

AL

t·_·_·~·_----

MU

LTIP

LIE

RX

TA

L1

--'-

'-'-

"'7

TOP

OW

ER

OS

CIL

LA

TO

RS

Uf

V3

AV

4B

i i

PO

WE

RS

UP

PLY

14-i5

~~

~P

UL

SE

IV

ISU

AL

MIX

ER

FIL

TE

RS

QU

AR

ING

CO

UN

TIN

G\

V1

7,

VIS

,VI9

AB

MIX

ER

MC

KC

KC

AM

PL

IFIE

RK

CD

ISC

RIM

INA

TO

RV

20

,V21

,V

22

V3

BV

4A

VI3

,VI4

VI5

VI6

AU

RA

LC

AR

RIE

RD

EV

IAT

ION

PE

RC

EN

TA

UR

AL

MO

DU

LATI

ON

AU

DIO

OU

TP

UT

PE

AK

MO

DU

LAT

ION

IND

ICA

TO

R

VIS

UA

LC

AR

RIE

RD

EV

IAT

ION

IR

FIN

PU

T

iV

ISU

AL

CA

RR

IER

II

.~-_._._._._._._-_._._._.-l--

I I.

·I

II

I'.

·I

--_.~._._-_._._._.~._._._._._._.~

Fig

,3

.M

od

el

33

5E

Blo

ck

Dia

gra

m

component before being applied to he squaring amplifier.input of the filter so tha an external audio vol age may befrequency counter.

Jl is provided a heused 0 calibrate the

V13 serves as cathode coupled clipper tube 0 produce a square wave shape.

V l4B is a phase inverter which applies the 3.5 kc signal to the grids ofV15A and V15B. The plate current of V15A and V15B is derived from a cons antcurrent generator tube V16.

The operation of the switching tubes V15A and V15B is as follows: The gridof V15A is driven positively while the grid of Vl5B is driven to cut off. All of thecurrent from V16 flows through V15A. In this case however, C240 takes all of thecurrent initially, but as the charge of C240 is building up, more of the currentflows through R269 until finally C240 is fully charged to a voltage which is exactlyequal to the constant current provided by V 16 flowing through R269. In this mannera pulse of accurately controlled current flows through C240 for each alternate halfcycle. In a similar manner, the switching of V15B generates a pulse of accuratelycontrolled current hrough C241.

The time constants of the RC network are selected so tha he capaci orswill become fully charged on each half cycle a the highes frequency to be meas­ured (3.5 kc plus max. carrier deviation).

These charge and discharge current pulses are rec ified by means of abridge rectifier, and he resultant direct current is apphed 0 Ml. The averagevalue of the current passing through Ml is a func ion of frequency or nUInber ofpulses per uni time only. This opera ion makes he response of Ml direc lyproportional to frequency. In order to balance out the reading tha would be ob­tained on Ml with a 3. 5 kc signal, some current is applied in reverse through Ml.This current is generated by the vol age drop across R279, part of the ca hoderesistor of the constant current generator tube.

The sensitivity of this circuit as a frequency meter is directly proportionalto the constant current. However, should there be variations in either the constantcurrent or in the charac eristics of the ubes, the meter will still read zero centerwith 3 9 5 kc applied.

The aural channel is necessarily more elaborate than the visual channel.V5B is the aural mixer tube whose ou pu frequency is 150 kc plus and minus thefrequency devia ion.

This signal is applied to V7B where it is amplified. When in the calibrateposition V4B is connec ed as a crystal con rolled 150 kc oscillator to calibra e thefrequencYCOUnting circuits. A crys allimi er, CRI and CR2, is connected to thegrid circuit of V6A so tha the driving voltage is limited and clipped 0 provide asquare wave shape. V6A and V6B serve as cathode coupled clipper tubes forsquaring the 150 kc signal. V7A operates as a phase inver er providing a balancedsignal voltage for V8A and V8B. V8A and V8B cons itute a squaring amplifier be­fore the signal is applied to the frequency coun ing current. The pulse countingdiscriminator V9, V 12) is similar to the counter in the visual channel excep hatit contains circuitry that acts as a discriminator for the f -m modulation on he auralcarrier. The current applied to the deviation meter, M2, consis s of a series of

-11-

pulses of direct current. the 150 kc components of which are by-passed throughC244.

When frequency modulation is applied to this counter circuit, the rectifiedvalue of the current varies linearly with frequency deviation. This rectifiedcurrent generates an audio signal in the primary of transformer T1. VIO servesas an audio amplifier with feedback by means of tertiary winding on T 1 so that theresponse and gain is stabilized. The audio output from VIO is applied to VllBwhich serves as a cathode follower to provide a distortion free audio output formonitoring and for measuring purposes. The networks and the rectifier whichdetermine the operation of modulation meter, M3, are connected to the cathodecircuit of V llA. This circuit is a peak reading voltmeter in which a direct cur­rent voltage is generated across C222 proportional in value to the peak value ofthe audio frequency. Additional networks are provided so that together with thedynamic characteristics of the meter movement the dynamic re sponse character­istic of the modulation meter corresponds to that specified by the F. C. C. Thesame direct current voltage which operates the modulation meter is fed throughR303 to the grid of V17. V17 is a thyratron arranged to flash a lamp when thepeak value of audio voltage exceeds a preset level which is controlled by R312 inthe cathode circuit of V 11. This pre set value may be regulated from 50 to 120%modulation.

The power supply provides a 300 volts regulated direct current source.Hum reduction is improved by V22 which is sensitive to AC but not DC voltagecomponents.

Transformer T3 supplies a regulated voltage to the heaters of the oscillatorand mixer tubes.

-12 -

Maintenance

Case Removal --

The case can be removed satisfactorily while the instrument is in therack. However, very little if any work can be performed on the instrument whileit is in the rack. Therefore, the instrument should be removed from the rackwhenever maintenance work is necessary.

Place the instrument, control panel side down, on a flat surface and removethe two screws next to the rectangular opening in the back of the case. Pull thecase away from the control paneL

To replace the case reverse the above procedure being careful to guidethe fan plug into the receptacle on the chassis.

Air Filter Maintenance --

The air filter should be cleaned periodically. In some locations cleaningmay be necessary every two weeks but in most cases less frequent cleaning willbe required.

The filter is mounted in the back of the case so that one half of the filterarea is in use. When one half of the filter becomes dirty, the filter-unit may beturned so that the clean half is in use.

The procedure for cleaning the filter is as follows:

1. Remove surface loaded lint and large particles from the air filter byvacuuming or gently tapping the filter with the dirty side down.

2. Direct a stream of water, preferably hot, from a hose or faucet ateach side of the filter to flush out the old adhesive and accumulated dirt.

3. Shake out excess water and allow to dry.

4. Apply Filter Coat No. 3 with the HAND IKOTER spray directed at(Intake) side of filter until visible baffles are liberally coated.

WARNING

Do not spray to the extent that adhesive runs off surface or drips.Excessive adhesive may be drawn into the instrument by the fan.

5. Filter is now ready for service.

Meter Lamp Replacement --

The two lamps that illuminate each meter may be replaced by unscrewingthe two screws on the front of the meter and pulli ng the meter case away fromthe control paneL The lamps inside of the meter case may then be removed and

-13-

replaced with new lamps. Replace the meter case on the control panel and tightenthe two mounting screws.

Tube Replacement --

Whenever a tube is replaced, the following table should be consulted todetermine whether or not the characteristics of the replaceme nt tube will neces­sitate circuit adjusttnents. The procedures for performing these adjustmentswill be found in the Circuit Adjustments section.

TUBE REPLACEMENT TABLE

Tube

VI

V2

V3

V5

V6

V7

V8

V9

VlO

Vll

V12

V13

V14 L

V15/

V16

Function

Master Oscillator

Frequency Multiplier

Frequency MultiplierVisual Mixer

150 kc Oscillator4.3535 mc OscillatorVisual Mixer

Frequency MultiplierAural Mixer

Amplifier

Amplifier

Amplifier

Switching Tube

Amplifier

Cathode follower

Constant CurrentGenerator

Amphfier

Amplifier

Switching Tube

Constant CurrentGenerator

Required Circuit Adjustments

Check master oscillator frequency.

Check multiplier tuning.

Check multiplier tuning.

{ Not critical; 150 kc oscillator activity indi­{ cated on vi sual meter, calibrate.{ 4.3535 mc oscillator activity indicated on{ visual meter, Tune 2.

Check multiplier tuning.

Not critical.

Not critical.

Not critical.

Reset controls C and D.

{ May have to select for minimum hum.{May have to select for mmimum distortion.

Same as VlO.

Reset controls C and D.

Not critical.

Not critical.

Reset controls A and B.

Reset controls A and B.

-14-

• vvut:t....-~

p..~pc:c<C1

Tube

V17

J

Function

Peak Indicator Trigger

Required Circuit Adjustments

Check calibration of SO% - Il0% controlagainst modulation meter and reset ifnecessary.

VIa Xtal Oven HeaterControl

Vl9 Series Regulator

VlO Amplifier

VlI Voltage reference

Vll/ Amplifier

Not cri tical.

Not critical.

Reset high voltage regulator to 300 volts.

Reset high voltage regulator to 300 volts.Reset controls Band D.

Not critical

.'

Circuit Adjustments and Maintenance Procedure --

In addition to the external adjustments, inside the instrument cabinet thereare a number of controls which may require adjustment occasionally due to tubeaging or tube replacement. The procedure for making these adjustments will bebroken into four main circuit sections~

A. R.F. section (tubes VI, Vl, V3. V4, VS. V7B)

B. Aural counter section (tubes V6. V7A, va, V9. VIO, VII, Vll)

C. Visual counter section (tubes VI3, V14. VIS, VI6)

D. Power supply and crystal oven control circuit (tubes V17. Vl8, V19.VlO. Vll. Vll)

NOTE

Whenever the instrument is removed from the relay rack for circuit adjust­ment or maintenance. the instrument should be connected to the power line so thatthe crystal ovens will remain at operating temperature.

A. R. F. Section

1. Master oscillator - tube V I(See Fig. 4 for the rocation of the adjustments. )

C I 04 - This variable capacitor is the coarse frequency control. Itis in parallel with CIOl. the front panel CRYSTAL TUNING fine frequency control.This control will normally be adjust ed only when:

a. Changing tube V Ib. Frequency drifts beyond range of CRYSTAL TUNING controlc. Changing quartz crystal

-15-

In TUNE 1 position, the modulation meter is connec ed to indicate thedrive from the local oscillator to the first multiplier. The proper frequency willbe obtained somewhere near the point of maximum drive.

Caution should be observed in adjusting C 1 04. The high frequency crystalsused have a number of modes at which they will oscillate, and it may be possibleby changing CI04 too far to get the crystal to oscillate in one of these spuriousmodes which will be at the wrong frequency. A mimmum adjustment should bemade. (See also section on master oscillator frequency measurement. )

L20 - This is a variable inductance which adjusts the output im­pedance of he master oscillator for maximum drive into the input capacity of thefirst multiplier, V2. This control wlll seldom need adjustment. It may be checkedwhen V2 is replaced. In TUNE 1 position, the deviation meters are adjusted toindicate the grid current of the respective mixers. L20 should be adjusted in thisposition for maximum indication on these meters.

2. Multiplier - tube V2

C1l3 - This capacitor resonates with inductance L2 to' select thedesired harmomclilUltiplication in V2. It may be necessary to adjust C1l3 whenreplacing V2. Adjust C 113 for maximum indication on either deviation meter inTUNE 1 position. Since it may be possible to adjus C1l3 far enough to obtain thewrong harmonic, a minimum adjustment should be made. The L2, C1l3 tank istuned to two times the master crystal frequency for channels 2, and 6 through 83 ..(See first page of instruction book for crystal frequency.) It is tuned to three time sthe crystal frequency for channels 3, 4, and 5. This frequency may be checked atL2 with a grid dip meter if desired.

3. Aural Multiplier - tube V5

Cl35 - .This capacltor resona es with inductance L9 to select theproper harmonic frequency of multiplier V50 It may be necessary to retune C13Safter replacing V5. Adjust C 135 for maximum indication on the aural deviationmeter in TUNE 1 position. This tank circuit operates at the following crystalharmonic:

...-

Channel 23,4,56 - 83

Second harmonicThird harmonicFourth harmonic

This frequency may be checked at L9 wlth a grid dip meter if desired.

4. Visual multiplier and mixer - tube V3

C1l6 - This capacitor resonates with inductance L3 to select theproper harmonic frequency of multipher V3. It may be necessary to retune Cl16after replacing V3. Adjust C 116 for maximum indication on the visual deviationmeter in TUNE 1 position. This tank circuit operate s at the following crystalharmonic:

Channel 23,4,56 - 83

Second harmonicThird harmonicFourth harmonic

This frequency may be checked at L3 with a grid dip meter if desired.

-16-

~

>0

.0<C'"d~ro-.......ro....'"'~

U)

~\l)

...........N

~.....

[il\l)

C"'lC"'l

-:0-

f

Fig. 4. Model 335E Location of Adjustment Controls

-

L6 - This inductance resonates with the output capacity of V3 andthe input capacity of V4 at 4.35 mc, the output frequency of V3. This control willseldom need to be adjusted. It is adjusted in USE position with the visual trans­mitter r.f. input connected. W"th an oscilloscope connected at pin 2 of V14. ad­just L6 for maximum 3. 5 kc signal.

5. 4.3535 mc oscillator and mixer; 150 kc oscillator - tube V4

C 143 - This small variable capacitor injects a certain amount ofthe r.£. input signal on the mixer grid of V3. This provides greater conversiongain for the higher r.f. input frequencies. In instruments on channels 2 to 13, itwill have little effect. It may be neccesary to readjust C143 when changing V3.Adjust C143 in the USE position with the visual transmitter input connected. Withan oscilloscope connected to pin 2 of V14, adjust C143 for maximum 3.5 kc signal.

C 145 - This capacitor provide s adjustment of the 4. 3535 mc os­cillator which beats with the 4.35 mc signal from the V3 visual mixer to producethe 3.5 kc intermediate frequency for the visual counter. This control will seldomneed to be adjusted - only occasionally to compensate for long time drift of the4.3535 mc crystal.

To determine whether or not the 4.3535 mc oscillator has driftedand needs adjusting. refer to the block diagram of the instrument, Figure 3.Assume that both visual and aural counter circuits have been calibrated, 1. e •• theaural counter circuit indicates zero deviation for 150 kc i. f., and the visual counterreads zero deviation for 3.5 kc i. f. (See procedure for adjusting A. B. C. D controls).From the block diagram it will be seen that the only factors determining the readingof the aural deviation meter are the frequencies of the aural transmitter and themaster crystal oscillator frequency. If a frequency check on the transmitter ismade, the CRYSTAL TUNING control should be adjusted to make the aural deviationmeter indicate the known frequency error of the aural transmitter. The visualdeviation meter should then indicate the same frequency error as that which thevisual transmitter is measured to have. If it does not indicate this frequency cor­rectly, the 4.3535 me crystal frequency is incorrect. SInce this 4.3535 oscillatoris quite stable, the measurements of the visual and aural transmitter frequenciesshould be known positively to be correct before adjusting C145. unless the 4.3535me frequency can be measured directly. The direct method is to connec a fre­quency counter, or other accurate frequency measuring device to pin 3 of V4. Ad­just Cl45 for exactly 4.3535 mc.

L8 - This inductance resonates with C146 and the output capacity ofV4 to form the plate tank of the 4.3535 mc oscillator. L8 will not often requireadjustment unless the 4.3535 mc crystal is replaced. L8 is adjusted so that inTUNE 2 position (in which the visual deviation meter indicates the activi y of the4.3535 mc oscillator) the activity is about 25% below maximum activity on the highfrequency side of maximum activity. To set, turn adjusting slug of L8 until asmuch as possible of the screw extends above the chassis. Next, watching thevisual deviation meter in TUNE 2, turn the screw back in until maximum activityis reached. Then back out until the meter indicates about 25% drop in activity.Note~ since this adjustment affects the 4.3535 mc frequency. C 145 must be ad­justed if L8 is adjusted.

-17-

150 kc crystal - In CALIBRATE position the right hali of V4 isconnected as a 150 kc oscillator to calibrate the aural deviation meter. The gridof V4 is connected to alSO kc crystal. The visual deviation meter indicates theoscillator activity. The plate tank of his oscillator is L7 in parallel with Cl29and Cl30. There are no adjustments on this frequency. The frequency of this os­cillator may be checked with a frequency counter at pin 3 of V4 p or at terminal6 of the back lip terminal board. This measurement must be made in GALIBRATEposition. A new crystal should be obtained if frequency is not 150 kc ! 50 cps.

B. Aural Counter Section

1. Deviation meter and modulation meter calibration

C - This front panel adjustment controls the amount of current applied to theaural devia ion meter to offset the zero point 150 kc. so that the meter reads zerodeviation with alSO kc i. £. Adjust "C" in CALIBRATE position for zero deviationon the aural deviation meter.

D - This front panel control adjusts the constant current in V12 which is appliedto the switching tube V9. The amount of this current determines the full scalesensitivity of the aural deviation meter and the full scale sensitivity of the modu­lation meter. In the CALIBRATE position, the modulation meter indicates theconstant current level. The sensitiVIty of the modulation meter has been adjustedat the factory so that the correct constant current will read 100%. "DII should beadjusted in CALIBRATE for 100% on the modulation meter.

R244 - This control," on the back lip. has been set at the factory toadjust the modulation meter sensitivity in CALIBRATE so that it reads 100% withthe correct constant current. This control should only be moved when calibratingthe modulation meter. To calibrate the modulation meter. proceed as follows:

1. Set a known percent modulation. perferably between 100 cps and 1 kcon the aural transmitter using the null method as described in this book.

2. In USE positionp adjust "D" control to make modulation meter read the'known percent modulation.

3. In CALIBRATE position. adjust R244 to make modulation meter read100%.

2. Peak Modulation Indicator

50 -100% - This front panel control adjusts the bias voltage of VI 7.the grid controlled thyratron. When the grid voltage. which is proportional to thepercent modulation, exceeds the bias voltage, the tube fires and flashes the lamp.To calibrate this control. apply a steady modulation to the aural transmitter. Readthe percent modulation on the modulation meter. If necessary. loosen the setscrews on the 50-100% control knob. and slip knob so that the lamp fire s at theindicated meter percentage.

-18-

3. Audio Amplifier - tubes VIa, Vll

Any distortion that is introduced in the audio output of the aural monitoris most likely to be caused by bad tubes in either VIa or Vll circuits. Provisionhas been made to check the distor ion of he audio section alone. At the veryfront of the aural counter deck below resistor board RB7 (see photograph Figure9) is a two point terminal board. The orange leads are electrically in serie s withC213; the gray leads in series with the lead on the schematic going between C216and R246. To measure distortion in the amplifiers, loosen the terminals screwsand pull away the spade lug leads. Connect a jumper from the gray lead terminalpoint to ground. Connect one end of a 5, 000 ohm resis or to the orange leadterminal point. Connect a low distortion audio oscillator between the other resistorend and ground. Connect distortion analyzer between terminals 4 and 5 on backterminal board. Adjust oscillator voltage to make modulation meter, in USEposition, read 100%. This will require about one volt. Measure distortion atoutput terminals. It may be necessary to try several tubes to obtain low humand low distortion. See also section 4 below.

4. Hum Bucking Potentiometer

R301 - This control on the back of the aural deck is a center tappedpotentiometer connected across the heater voltage of the audio amplifier tubes,VIa and VII. It is adjusted for minimum hum in the high impedance output p termi­nals 4 and 5 on the back terminal board in CALIBRATE position. Although thiscontrol will reduce hum with almost any tube complement, It will not compensateentirely for tubes with high hum, particularly in VIa and Vll circui s.

C. Visual Counter Section

1. Deviation meter calibration

A - This front panel control adjusts the amount of current applied to the auralq.eviation meter to offset the zero point 3.5 kc, so that the meter indicates zerodeviation with a 3.5 kc i. f. To calibrate this meter and counter circuits it isnecessary to provide a 3.5 kc signaL Connect an audio oscillator to a phone pluginserted in jack JI on the front panel. Set switch to USE position. Set oscillatorto 3. 5 kc, level about one volt. Adjust "A" for zero deviation. Note that anyinaccuracy in the oscillator frequency will be reflected in the calibration.

B - This front panel control adjusts the constant current in Vl6 which is appliedto the switching tube VIS. The amount of this current determines the full scalesensitivity of the deviation meter. With the external oscillator connected as beforefor setting "A". adjust oscillator frequency to 5 kc. Adjust liB" to read +1. 5 kc.Reset oscillator to 2 kc. Between 2 and 5 kc input frequency, adjust "B" foroptimum accuracy at +1. 5 kc and -1. 5 kc. As was noted before, the accuracy ofthis calibration is determined by the oscillator frequency accuracy.

D. Power Supply and Crystal Oven Heater Control Circuit

1. 300 volt regulated supply

This supply consists of a standard d. c. regulator consisting of tube Vl9 p

20, 21 plus an a. c. amplifier tube V22 to reduce the output ripple voltage and

-19-

lower the a. c. internal impedance.measured at pin I of V 11 should beapplied to the monitor.

In USE position, the B+ ripple voltage asIe ss than O. 003 volts with no r. f. signals

R316 - This control. on the back lip of the instrument, is used toadjust the regulated voltage to +300 volts. This voltage can be measured at pin Iof VI!. This voltage should be +300 volts at any position of he CARRIER LEVEL­CALIBRATE switch at a line voltage of 115 ! 100/0 volts. Poor regulation is mostlikely to be caused by a bad tube - V19. 20, 21 low voltage from bridge rectifiers.;or excessive cutrent drain due to component failure in instrument.

2. Crystal oven heater control circuit

Tube Vl8 and its associated circuitry are used to operate the masteroscillator crystal oven temperature control. The use of a vacuum tube reducesthe current through the sensitive contacting mercury thermostat, thus greatlylengthening its life. The relay must be energized for power to be applied to thecrystal oven heater. This prevents overheating and consequent damage to thequartz crystal on failure of most of the circuit components.

Measurement of Master Oscillator Frequency --

The measurement of frequency variation of the aural and visual transmittersis based entirely on the determination of the difference frequency between thetransmitters and a harmonic of the internal crystal oscillator. Therefore the ac­curacy of this frequency measurement is dependent on the accuracy and the stabilityof the master oscillator and the frequency counting circuits.

It will be necessary to check the master oscillator frequency whenever thepower has been disconnected from the unit, allowing the master crystal oven tobecome cold. It is possible, and quite often found, that even stable quartz crystalswill not corne back on frequency exactly after cooling and reheating. Severe shockand vibration, such as encountered in shipping, or accidental dropping, will alsorequire a frequency check. And periodic frequency checks should be made to allowcompensation of frequency drift.

Before checking the master oscillator frequency, it is imperative that thepower line has been connected for 24 hours to allow the oven and crystal to temper­ature stabilize, and the instrument turned ON at least one hour 0

There are two methods of frequency measurement - direct and indirect.

1. In the direct method the frequency of the master oscillator or one ofits harmonics is measured directly with a frequency counter. A Hewlett-Packard524B Frequency Counter, or equivalent, should be used. The counter should becapable of measuring frequencies to 60 mc. The easiest place to obtain this signalis at the aural r. f. input jack. In USE position the following harmonics of themaster crystal oscillator frequency will be found a this jack~

PJt::1p

PJco<:ctI

Channel 23 0 4,56 - 83

Second harmonicThird harmonicSecond and Fourth harmonic

-20-

The correct crystal oscillator frequency is given on the first page of theinstruction book.

Since the accuracy of a frequency counter depends on the crystal oscillatorfrequency which is divided down to determine the gate time, for maximum accuracythe frequency counter crystal frequency should be set against a secondary standardor station WWV. Most counters use crystals at 100 kC D or some multiple of 100 ke.To compare with station WWV, couple a small amourif'of the 100 kc (or other) fre­quency into the antenna terminals of a radio receiver t~ned to one of station WWVisstandard frequencies. One of the harmonics of the 100 kc signal will beat with theWWV signal to provide an audio note which may be brought to zero beat by adjustingthe 100 kc frequency control. Human hearing will not distinguish a very low fre­quency beat note. However, the "5" meter, if the receiver has one. may be usedto determine beat note s of one cycle per second or Ie sSG Watch "5" meter for aslow beat note after the audio beat has dropped below hearing range. It may benecessary to adjust the coupling of the signal from the frequency counter so thatthe desired harmonic is about equal in amplitude to the WWV signaL Frequencymeasurements with an accuracy of one part in ten million are readily made withthis technique.

2. The indirect method of frequency measurement utilizes a frequencycheck on the transmitter by a separate monitoring service - usually at a remotelocation. At any moment, the monitor should indicate the frequency error. asreported, of the two transmitters. If it does not, it should be recalibrated.

The procedure is as follows~

a. Calibrate the visual and aural counters, i. e. adjust controlsA, B, C, D. The visual meter will now read zero deviation for a 3.5 kc i. f.; theaural deviation meter will read zero for alSO kc i. f.

b. From the monitoring service, obtain a frequency check on theaural transmitter. Set the CRYSTAL TUNING control so that the aural deviationmeter indicates the frequency error of the transmitter as obtained from the monitor­ing service. (Example~ if monitoring service says transmitter is 400 cps high.adjust CRYSTAL TUNING control so aural deviation meter reads + O. 4 kc.)

c. From monitoring service, obtain a frequency check on the visualtransmitter. The visual deviation meter should indicate any frequency error cor­rectly. If it does not, the 4.3535 mc oscillator frequency control. C145, needsadjustment. See section on C145. When using the indirect method, it is preferableto have elephone contact with the moni oring service, so hat no frequency drift ofthe monitor and the transmitter doe s occur between the time the measurement iscompleted and the corrections made.

-21-

Measure!nents of Percent Modulation on Aural Trans!nitter by the Carrier NullMethod --

To calibrate the !nodulation !neter, a separate funda!nental !nethod of !neas­uring frequency swing !nust be e!nployed. The percent !nodulation of the FM trans­!nitter !nay be !neasured conveniently by the carrier null !nethod using the IF signalfro!n the !nonitor. Ter!nina16 on the rear ter!ninal board supplies a s!nall IFsignal which is centered about 150 kc in frequency and contains the full FM swingof the trans!nitter. This output should be connected to the antenna ter!ninal of acO!n!nunication type receiver, preferably one which will tune to 150 kc. Howeverthe signal is in the for!n of a pulse, so that the second and third har!nonics can beused.

To start, the trans!nitter should be un!nodulated and the receiver tuned to150 kc. Adjust the BFO to give a beat note of a few hundred cycles. As sine wave!nodulation is gradually applied to the trans!nitter, the a!nplitude of the trans!nittercarrier, and hence the receiver beat note, will go through successive a!nplitudenulls. It is possible to deter!nine the frequency swing, or percent !nodulation, byadjusting the !nodulation voltage for a certain null, knowing the !nodulating frequency.When this null is obtained

Frequency swing = (Modulation index) x(Modulating frequency)

The !nodulation index depends on which particular null is chosen, and isequal to the argu!nent of the zero order Bessel function when the function has zerovalue. These values of !nodulation indices are given in the following table. Forhigher nU!nbers, the values are spaced at intervals of pi (3. 1416).

For te1evislon FM, 25 kc frequency swing has been chosen as 100% !nodu­We !nay therefore rewrite the previous equation in ter!ns of percent !nodu-lation.

1ation.

NULL NO.

123456789

10

MOD INDEX

2.4055.5208.654

11. 79214.93118.07121. 21224.35327.49430.635

% MODULATION = (MODULATION INDEX) x(MODULATING FREQ.) x 100

25,000

where the !nodulating frequency is in cycles per second.

Exa!nple: with no !nodulation on the trans!nitter, the receiver has beentuned to 150 kc and BFO adjusted for a few hundred cycles beat note. 4,000 cps

-22-

Q)

>o'~~

sinusoidal modulation is applied gradually. The amplitude of the beat note de­creases. goes through a null, rises, decreases, and comes to a second null. Whatis the percent modulation?

% modulation = 5. 520 x 4000 x 10025,000

= 88.4%

If the receiver is tuned to 150 kc. a modulation swing of 25 kc is used for100% modulation. However if the receiver is tuned to a harmonic, say 450 kcfor the third harmonic. the modulation swing is also multiplied by three so thatthe percent modulation as calculated above should be divided by three.

It should be noted that the accuracy of measurement of modulation per­centage cannot exceed the accuracy of the calibration of the modulation frequency.Also it is necessary that the modulation signal have low distortion if the nulls areto be sharply indicated.

Refer to the paragraph on the adjustment of R244 in the Maintenance Sectionfor the procedure for calibrating the modulation meter.

Measurements of Incidental Amplitude Modulation on Aural Carrier --

A special jack is provided on the -hp- TV Monitor to facilitate the meas­urement of spurious amplitude modulation on the aural carrier. This jack islocated on the back of the instrument and is marked J5. Measurements of spuriousAM modulation can be made at this jack with sensitive DC and AC voltmetersin the following described manner. It is not necessary that the monitor be turnedon for this te st. since only germanium diodes in the input circui are used.

1. With the function selector,in CARRIER LEVEL position, measure theDC voltage across a phone plug inserted into J5 with a vacuum tubevoltIneter. This voltage will be between about O. I volt and 3 volts.Record this reading.

2. Replace the DC voltmeter with a sensitive AC voltmeter, such as the-hp- 400 A, B, C, D or the voltmeter section of an -hp- 330B, C, DDistortion Analyzer. Read and record this AC voltage.

3. The percentage of amplitude modulation may thelc be obtained with thefollowing formula:

% AM = 141. 4 (AC voltage)DC Voltage

Example: The DC voltage measured 1. 78 volts. The AC voltage meas­ured O. 0013 volts.

% AM = 141. 4 x 0.00281. 78

= 0.21%

-23-

In some cases, the input voltage requirement of the 335E may be so lowthat difficulty may be found in measuring the se voltage s because of their low level.In this case it is permissible to readjust the coupling probe that samples the auraltransmitter output so that a DC level of up to, but not more than, three volts isobtained. After measuring tIle percent AM, the probe should be returned to itsprevious position as indicated on the aural deviation meter in CARRIER LEVELposition.

Noise Generated in Aural Monitor

The noise generated in the Model 335E is at least 60 db below t4e audiooutput level resulting from 100% modulation at low frequencies. Assuming that100% modulation at a low frequency provIdes exactly 10 volts output at the high­impedance audio output of the Model 335E, the noise as measured across a 100,000ohm (minimum) load on terminals 4 and 5 should be not more than 10 millivolts.

Noise should be measured with the switch in the "CALIBRATE" position. Inno case should noise be measured by removing the RF Input from the monitor withthe switch in the "USE" position, nor should the noise be measured by shorting theRF input. When the RF is removed with the switch in the "USE" position, the moni­tor operates with the equivalent of a float1ng grid circuit causing an increase in thenoise level.

-24-

33

5E

1/2

2/5

4S

eric

..l

1an

dab

ov

e•

.,.

Tro

ub

leS

ho

oti

ng

--S

'

Ag

reat

am

ou

nt

of

tim

ecan

be

sav

ed

intr

ou

ble

sho

oti

ng

the

Mo

del

33

5E

TV

Mo

nit

or

if(1

)th

efr

eq

uen

cy

of

the

maste

ro

scil

lato

rin

the

mo

nit

or,

the

vis

ual

tran

sm

itte

rfr

eq

uen

cy

,an

dth

eau

ral

tran

sm

itte

rfr

eq

uen

cy

are

ac­

cu

rate

lyk

no

wn

;an

d(2

)ju

dic

iou

su

seo

fth

em

ete

rin

dic

ati

on

so

fth

efr

on

tp

an

el

mete

rsis

mad

eas

they

are

-­

swit

ch

ed

into

vari

ou

scir

cu

its

wit

hth

eF

un

cti

on

Sele

cto

rS

wit

ch

.

Th

efo

llo

win

gch

eck

list

of

po

ssib

lein

dic

ate

dtr

ou

ble

sw

ill

help

inn

arr

ow

ing

do

wn

the

are

ain

wh

ich

afa

ult

may

be

ex

pecte

d.

Sy

mp

tom

s

A.

Vis

ual

dev

iati

on

mete

rin

dic

ati

ng

pro

perl

y;

au

ral

dev

iati

on

mete

rerr

ati

co

ro

ffscale

.

I N \J1 I

Test

Pro

ced

ure

1.

Ch

eck

inp

ut

lev

el

fro

mau

ral

tran

sm

itte

rin

CA

RR

IER

LE

VE

L.

2.

Ch

eck

au

ral

dev

iati

on

mete

rin

CA

LIB

RA

TE

-it

sho

uld

ind

icate

zero

dev

iati

on

;if

itd

oes

no

t,ch

eck

:

a.

Vis

ual

dev

iati

on

mete

rin

CA

LIB

RA

TE

tosee

that

15

0k

co

scil

lato

ris

op

era

tin

g;

ifn

ot,

ch

eck

V4

.

b.

Ob

serv

esi

gn

al

wit

ho

scil

losc

op

eat

pin

6,

V7

inC

AL

IBR

AT

E.

Sh

ou

ldb

e1

50

kc

si

ne

wav

e,

ov

er

fiv

ev

olt

sr.

m.

s.

c.

Ch

eck

tub

es

an

dcir

cu

its

of

V6

,V

7,

V8

,V

9,

V1

2.

beco

me

mo

resq

uare

at

each

succeed

ing

tub

ep

late

.p

eak

top

eak

sq

uare

wav

eam

pli

tu9

-es

are

:

Wav

efo

rmsh

ou

ldA

pp

rox

imate

V6

V7

V8

V9

pin

1p

in1

,3

pin

1,

9p

in1,

9

16

vo

lts

15

vo

lts

16

vo

lts

42

vo

lts

Th

ese

peak

top

eak

vo

ltag

es

sho

uld

be

ab

ou

tth

esam

ein

US

Ep

osi

tio

n.

d.

Ch

eck

cry

sta

lb

rid

ge

CR

3.

May

be

inte

rch

an

ged

wit

hC

R6

.

3.

Ch

eck

freq

uen

cy

of

au

ral

tran

sm

itte

r.

4.

Ch

eck

freq

uen

cie

so

fm

aste

ro

scil

lato

ran

dv

isu

al

tran

sm

itte

r-

bo

thm

ay

be

off

.

Tro

ub

leS

ho

oti

ng

(Co

nti

nu

ed

)

Sy

mp

tom

sT

est

Pro

ced

ure

5.

Ch

eck

lev

el

of

15

0k

csi

gn

al

at

pin

6,

V7

inU

SE

po

siti

on

;sh

ou

ldb

eo

ver

thre

ev

olt

srm

s.

Ifto

olo

w,

ch

eck

:

a.

Gri

dcu

rren

to

fau

ral

mix

er,

as

ind

icate

do

nau

ral

dev

iati

on

mete

rin

TU

NE

1-

sho

uld

ind

icate

betw

een

+2

kc

an

d+

6k

c.

Ifto

olo

wch

eck

V2

an

dV

5,

tun

ing

of

C1

l3an

dC

13

5.

6.

Ch

eck

B+

vo

ltag

ein

US

Ep

osi

tio

n;

sho

uld

be

30

0v

olt

s.

B.

Au

ral

dev

iati

on

mete

rin

dic

ate

sp

rop

erl

y;

mo

du

lati

on

mete

rw

ork

lng

;v

isu

al

dev

iati

on

mete

rerr

ati

co

ro

ffscale

.

I N 0'

I

1.

Ch

eck

inp

ut

lev

el

fro

mv

isu

al

tran

sm

itte

rin

CA

RR

IER

LE

VE

L.

2.

Co

nn

ect

au

dio

osc

illa

tor

toJl

as

desc

rib

ed

inp

roced

ure

for

ad

just

ing

co

ntr

ols

"A"

an

d"B

"in

Main

ten

an

ce

Secti

on

of

this

man

ual.

Ch

eck

cali

bra

tio

nan

dse

nsi

tiv

ity

inU

SE

po

siti

on

.M

ete

rsh

ou

ldin

dic

ate

ac­

cu

rate

lyw

ith

inp

ut

lev

els

of

0.3

vo

lts

to1

0v

olt

srm

s.

Ifit

do

es

no

to

pera

teco

rrectl

yat

these

lev

els

,ch

eck

:

a.

Tu

bes

an

dcir

cu

its

of

V1

3,

V1

4,

VIS

,V

16

.W

ith

on

ev

olt

,3

.5k

cin

pu

tat

J1

,w

av

efo

rmat

each

succeed

ing

pla

tesh

ou

ldb

em

ore

sq

uare

.A

tV

ISp

inI,

9sq

uare

wav

esh

ou

ldb

eab

ou

t4

8v

olt

sp

eak

top

eak

.

b.

Ch

eck

30

0v

olt

sB

+in

US

Ep

osi

tio

n.

c.

Ch

eck

cry

sta

lb

rid

ge

CR

6.

May

be

inte

rch

an

ged

wit

hC

R3

.

3.

Ch

eck

sig

nal

at

ou

tpu

to

fV

4m

ixer

wit

ho

scil

losc

op

eto

see

ifit

isap

­p

rox

imate

lyco

rrect

freq

uen

cy

(2to

5k

c)

an

dp

rop

er

lev

el

(ov

er

0.5

vo

lts

rms.)

Th

ism

ay

be

ch

eck

ed

wit

hth

em

on

ito

rin

the

cab

inet

by

insert

ing

ap

ho

ne

plu

gin

toJ

1ju

st

far

en

ou

gh

soth

at

the

tip

of

the

ph

on

ep

lug

tou

ch

es

the

cen

ter

co

nta

ct

of

the

jack

,b

ut

no

tfa

ren

ou

gh

too

pen

the

cir

cu

it.

Co

n­

nect

osc

illo

sco

pe

acro

ss

ph

on

ep

lug

.In

ad

dit

ion

toth

ed

esir

ed

3.5

kc

sig

nal,

mu

ch

of

the

mo

du

lati

on

on

the

vis

ual

tran

sm

itte

rw

ill

als

ob

ese

en

.It

wil

lsi

mp

lify

an

aly

zin

gth

eo

bse

rved

patt

er·

nif

this

test

isp

erf

orm

ed

at

ati

me

wh

en

the

vis

ual

tran

sm

itte

rm

od

ula

tio

nm

ay

be

rem

ov

ed

.If

lev

el

isto

olo

w,

see

para

gra

ph

4.

Iffr

eq

uen

cy

isw

ron

g,

see

para

gra

ph

5.

4.

Ifle

vel

of

ou

tpu

tsi

gn

al

of

V4

mix

er,

as

measu

red

inp

ara

gra

ph

3is

too

low

,ch

eck

:

aAoq

-epu

-e!

rep

as

'PS

/ZZ

/!':

lS£

£

ap.d

ao

ov

e

Tro

ub

leS

ho

oti

ng

(Co

nti

nu

ed

)

Sy

mp

tom

sT

est

Pro

ced

ure

a.

Gri

dcu

rren

to

fv

isu

al

mix

er,

V3

,as

ind

icate

din

TU

NE

1v

isu

al

dev

iati

on

mete

rsh

ou

ldin

dic

ate

betw

een

+0

.5k

can

d+

1.5

kc

wit

hn

or.t

.in

pu

tfr

om

the

tran

sm

itte

r.If

too

low

,ch

eck

V2

an

dV

3,

tun

ing

of

C1

13

an

dC

11

6.

b.

IfV

3m

ixer

gri

dcu

rren

tis

co

rrect,

as

ch

eck

ed

in(a

)ab

ov

e,

swit

ch

toT

UN

E2

.T

he

vis

ual

dev

iati

on

mete

rin

dic

ate

sth

e4

.3

53

5m

co

scil

lato

racti

vit

y;

mete

rsh

ou

ldre

ad

betw

een

+0

.5k

can

d+

1.

5k

c.

Ifit

do

es

no

t,ch

eck

V4

.

5.

Iffr

eq

uen

cy

of

ou

tpu

tsi

gn

al

of

V4

mix

er,

inp

ara

gra

ph

3,

isn

ot

betw

een

2k

can

d5

kc,

ch

eck

:

a.

Fre

qu

en

cy

of

vis

ual

tran

sm

itte

r.

b.

Fre

qu

en

cy

of

maste

ro

scil

lato

ran

dau

ral

tran

sm

itte

r-

bo

thco

uld

be

off

.

3 tv -.l I C

.A

ura

ld

ev

iati

on

mete

rin

dic

ate

sp

rop

erl

y;

mo

du

lati

on

mete

rerr

ati

c;

read

sh

igh

wit

hn

om

od

ula

tio

n;

hig

hn

ois

ein

au

dio

ou

tpu

tat

back

term

inal

str

ip.

c.

Fre

qu

en

cy

of

4.3

53

5m

co

scil

lato

r.S

ee

para

gra

ph

on

ad

justm

en

to

fC

14

5in

Main

ten

an

ce

Secti

on

.

1.

Ch

eck

rfin

pu

tin

CA

RR

IER

LE

VE

Lp

osi

tio

n,

sho

uld

ind

icate

betw

een

+2

kc

an

d+

6k

co

nau

ral

dev

iati

on

mete

re

2.

Ch

eck

no

ise

at

au

dio

ou

tpu

t,te

rmin

als

4an

d5

on

back

term

inal

str

ip,

inC

AL

IBR

AT

Ep

osi

tio

n.

No

ise

sho

uld

be

less

than

0.0

10

vo

lts

rms.

Ifn

ot,

ch

eck

:

a.

Gri

dcu

rren

to

f1

50

kc

oscil

lato

ras

ind

icate

do

nv

isu

al

dev

iati

on

mete

rin

CA

LIB

RA

TE

po

siti

on

.S

ho

uld

read

betw

een

+0

.5k

can

d+

L5

kc.

Ifn

ot,

ch

eck

tub

eV

4.

b.

Ch

eck

B+

30

0v

olt

ag

ein

US

Ean

dC

AL

IBR

AT

Ep

osi

tio

n,

ch

eck

hu

mo

nre

gu

late

dv

olt

ag

e.

See

para

gra

ph

C1

of

Main

ten

an

ce

Secti

on

.

c.

15

0k

csi

gn

al

lev

el

at

pin

6,

V7

inC

AL

IBR

AT

E.

Sh

ou

ldb

eat

least

fiv

ev

olt

srm

s.

Tro

ub

leS

ho

oti

ng

(Co

nti

nu

ed

)

Sy

mp

tom

sT

est

Pro

ced

ure

d.

Ch

eck

squ

ari

ng

op

era

tio

no

fli

mit

er

tub

es

as

descri

bed

inp

ara

­g

rap

hA

.2

ab

ov

e.

Pro

per

lim

itin

go

pera

tio

nis

essen

tial

for

low

no

ise

perf

orm

an

ce.

Ch

eck

lim

itin

gin

bo

thC

AL

IBR

AT

Ep

osi

tio

nan

dU

SE

po

siti

on

wit

hn

om

od

ula

tio

no

nau

ral

tran

sm

itte

r.

e.

Ifh

um

or

no

ise

sti

llis

ob

tain

ed

at

the

au

dio

ou

tpu

tin

CA

LIB

RA

TE

,ch

eck

cir

cu

its

of

VIO

an

dV

IIb

ym

eth

od

descri

bed

inB

3in

Main

ten

an

ce

Secti

on

.T

his

pro

ced

ure

can

be

use

dfo

rch

eck

ing

no

ise

by

red

ucin

gth

eau

dio

inp

ut

sig

nal

tozero

.

Ch

eck

that

10

00

oh

md

um

my

mete

rre

sis

tor

R2

71

isco

nn

ecte

d.

D.

Au

dio

ou

tpu

tv

olt

ag

en

orm

al;

mo

du

lati

on

mete

rn

ot

fun

c­

tio

nin

g.

1.

2.

Ch

eck

V11

tub

ean

dcir

cu

it.

,s1/

/6

cI'

re-

3.

Ch

eck

dio

des

CR

4an

dC

R5

.

E.

I N ():) I

Mo

du

lati

on

mete

ro

pera

tin

gn

orm

all

y;

peak

mo

du

lati

on

ind

icato

rn

ot

op

era

tin

g.

1.

2.

Ch

eck

tub

eV

17

.

Ch

eck

lam

pII

.

F.

Tem

pera

ture

of

maste

ro

scil

­la

tor

cry

sta

lo

ven

(as

ind

i­cate

do

nth

erm

om

ete

r)to

olo

w.

G.

Tem

pera

ture

of

maste

ro

scil

­la

tor

cry

sta

lo

ven

too

ho

t.

3.

Ch

eck

D.

C.v

olt

ag

eat

pin

1V

17

.S

ho

uld

be

ap

pro

xim

ate

lyte

nv

olt

sfo

r8

0%

mo

du

lati

on

.

1.C

heck

fuse

F2

on

back

lip

.R

ep

lace

ifn

ecessary

,w

ith

on

e-h

alf

am

pere

,"S

lo-B

lo."

2.

Ch

eck

tub

eV

I8.

3.

Ch

eck

vo

ltag

eacro

ss

C3

03

.

4.

Ch

eck

merc

ury

therm

osta

tin

cry

sta

lo

ven

.S

ee

secti

on

on

cry

sta

lo

ven

rem

ov

al.

1.C

heck

Rela

y1

tosee

ifit

isst

uck

inen

erg

ized

po

siti

on

.

2.

Ch

eck

merc

ury

therm

osta

tin

cry

sta

lo

ven

.S

ee

secti

on

on

cry

sta

lo

ven

rem

ov

al.

<l.l\

oqu

pU'e

t1'eP~S

frS

/22

/1'3:

S~£'

Master Oscillator Crystal Oven Disassembly and Maintenance --

Occasionally it may be necessary 0 disassemble the master oscillatorcrystal oven, either to change the quartz crystal or for servicing the oven. Theprocedure outlined below should be followed.

The temperature of the oven is regulated by a mercury ,:olumn thermo-stat which close s when the oven reaches operating temperature. When this thermo­stat, in the control grid circuit of tube Vl8 closes, it biases VI8 to cut-off, de­energizing the plate relay which disconnects the oven heater power. The reverseoperation occurs when the oven temperature drops to a point at which the thermo­stat opens. Note that tube VI8 must be conducting and the relay energized for theoven to heat. Therefore normal failures of the tube and relay will not cause theoven to overheat with possible consequent damage to crystaL As a further pro­tection against high temperatures, a second bi-metallic thermostat is inside thecrystal oven which is directly in series with the heater winding. It is normallyclosed, but will open at about 75 0 C, ten degrees above the normal operatingtemperature.

If the crystal oven does not heat, check fuse F2, tube VI8, and relayREL 1. If the oven overheats, remove crystal oven top and check mercury thermo­stat.

Occasionally the mercury colUlnn is separated by jarring and vibration ofthe unit in shipping. After turning on the instrument for the first time, keep aclose check on the temperature of the crys al oven as indicated on the front panelthennometer. Vlhen the oven has been on about thirty minutes, the crystal ovenshould remain automatically at a constant temperature. The thermon1.eter shouldindicate 65 0 e ± 30 e (or inside green sector). However, if the temperature goesbeyGncl 70 0 e (or outside green sector), the mercury column has probably beenseparated.

The procedure for oven disas sembly is as follows:

1. Disconnect power cord.

2. Remove front panel thermometer. See figure 4A.

3. Remove four 6 -32 nu1s (or screws) which hold oven top. See<

figure 43.

L1, Lift off oven top.

The quartz crystal will now be a cessible.

To check the lllercury thermostat:

5. On t::'", oven top, remove the two 6 - 32 sc rews which hold thethree contact tern1.iilal block. See figure 4A.

6. Pu.lling gently and steadily on the lead wires, pull out the lllercurythermostat.

-29-

7. Remove insulating tape and inspect the thermostat for mercurycolumn separation and minute gas bubbles in the mercury bulb.

8. If either bubbles or separation are present, place the mercurybulb in ice water until the mercury occupies only the bulb com­partment. Tap lightly to remove any bubbles or mercury globulesleft in the column. Then place the bulb in a containe r of wate rand heat until mercury completely fills column and a small portionof the enlargement at top of column. Then remove the thermostatand watch the mercury descend to room temperature. If thereis no separation or bubble pre sent, the thermostat may now beput back in service. It may be necessary to repeat the aboveprocedure more than once to unite all the mercury and remove allbubbles.

CAUTION: Immerse only the bulb portion of the thermostat. If thethermostat leads get wet or any moisture collects beneath theplastic insulation covering the contact rings, dry tube and leadsthoroughly before placing back in service. Otherwise leakagebetween leads may cause heater relay to remain open.

Re-assemble oven in reverse procedure. It will be necessary to checkthe master oscillator frequency after oven temperature has been stabilized for24 hours. See "Measurement of Master Oscillator Frequency" section for properprocedure.

-30-

t-'-.~N­V1H::--

en(1)

t;...-~............

THERMOMETER ---_

OVERHEAT THERMOSTAT-------------~

(NOT SEPARATELY REPLACEABLE,

~--

~ p/lNE:L.

\( fflONf

.,

INSULATION OMITTED FOR CLARITY)

~---HEATER ELEMENT

THERMOMETER MOUNTING NUTa WASHER

THERMOSTAT

3 CONTACT TERMINAL BLOCK

SPRING 8 WASHER ASSY ------

6-32 STUDS-----­(IN LATER MODELSSTUD REPLACED BYTAPPED INSERTS).

(4 )

CRYSTAL OVENCOVER ASSEMBLY

•

CRYSTAL OVEN'BASE

CRYSTAL

CRYSTAL MOUNT

OVEN BOTTOM SEAL----l--_~

I

~. !.OVEN BASE MOUNTI NG NUTS I ~(8-32 THREAD, BELOW CHASSIS)

(2 ) OVEN COVER MOUNTING NUTS(6-32 THREAD, BELOW CHASSIS) (4)LATER MODELS USE 6' 32 SCREWS (4)

WHERE COVER ASSY HAS TAPPED INSERTS.

Fig. 4A. Exploded View of Crystal Oven

,

Fig. 4B. Location of Crystal Oven Mounting Screws

,

Remote Meters --

Any or all of the front panel meter indications may be obtained remotelyby connecting external meters to the instrument in place of the dummy meterre sistors supplied with the Model 335E.

These remote meters are available from Hewlett-Packard. The metermovements and faces are identical with those on the control panel. Meters arefurnished wired with correct series resistor and BNC connector. Two BNCcable connectors are furnished for making up the cable to connect the meter tothe instrument.

The following designations should be used when ordering remote meters:

External AURAL CARRIER DEVIATION meter, Stock #335E-95AExternal PERCENT MODULATION meter, Stock #335E-95BExternal VISUAL CARRIER DEVIATION meter, Stock#335E-95C

To install remote meter:

1. Make up cable with proper length of RG-55/U cable with UG-88/Uconnectors at either end.

2. Remove the appropriate dummy meter resistor.

3. Connect the cable to the external meter jack and external meter.

4. It is usually unnecessary to recalibrate the instrument. Howeverany error introduced by installing the remote meter may be reducedby re -calibrating as follows:

a. When installing a remote VISUAL CARRIER DEVIATION meter,re-set adjustments A and B as indicated in the Visual CounterSection of the Circuit Adjustment and Maintenance Procedure.

b. When installing a remote AURAL CARRIER DEVIATION meteror PERCENT MODULATION meter, re-set adjustments C andD as indicated in the Aural Counter Section of the Circuit Adjust­ment and Maintenance Procedure.

The remote meters will give the same indications as the front panel metersin all positions of the FUNCTION SELECTOR switch except the PERCENT MODU­LATIoN meter in TUNE 1 position. In this position the remote PERCENT MODU­LATIoN meter will not indicate.

If desired, the faces of the remote meters may be illuminated by connecting6.3 volts, AC or DC, to the designated terminals on the remote meters. The sameprocedure as that given for the meters mounted on the control panel should be usedfor replacing burned-out bulbs.

-30A-

..... I

C3I

•.0

00

-.'

V5

LZ

lZ

eH

l~]~

C31

361

JFe3

11I~.

R3

2]

,",O

K

FIL

AM

EN

TO

ETA

IL

LZ2

Ze

H

C31

.

.:;J;.'0

00

V3

~~;)I~

.~

I~-

V1

9B

~6AS7

IY

t"

",

,•+

30

0V

\ "

V1

9A

!6A

S7

I ,.-R

310

'<S..

J14

_7

K

C3

08

30

0

"32_

>0

00

ALL

ME

TER

LIG

HT

SI

+IO~

V

R31

1

/ZUi~K

®FR

OM

VII

A

,IM

'·'M

.I'f"'" 2<

•,

0

1"313

14

,41

<

.",.wV

·$

~~

<),

(t~

•

VI

SE

EF

ILA

ME

NT

DE

TA

ILFO

R

I'tt:

IIr"

,":

6.3

V,V

8V9

V15fV6tV13~

JI

','-.'

-,'-,'

-.'IJt

IE..

,-6."

fV+V

20/

IIJ

8'~"I"'~

~

T3

••

.....

I"'I

bI

,'"

*II

-6

W

H~9

1111 it

SV

'Z01

111

I<>

--<

S'\

P

1

C3

03

Iv.,,,

p(

Ill

JF

• VI8

oIP

OW

EO1

54

FI

-3.2

A

SCH

EMA

TIC

DIAG

RAM

OF

MO

DEL

335E

TELE

VIS

ION

MO

NIT

OR

(PO

WER

SUPP

LYSE

CTI

ON

)S

ER

IAL

I8

AB

OVE

CI~2

'00

RI4

9

22

0K

* RI26

41

00

ell

l •

.CIZ

7

:fIef

1:50

KC

TO v.'

CIS

I.0

1...

F

'...

.1

RI4

73

3K

CIS

O5

00

","O

l"l!_

_-@

V7

B12

AT7

_C

I28

1:~I

"'F

11 '00

,,"

VtS

l».L

.C

QU

rrtTE

RO

UTP

UT

1'14

8

'.0

0146

4TRIZ~

10

00

01

"27

K

* RI33

1000

52

D

VIS

UA

L.C

AR

RIE

RD

EV

IAT

ION

RlI

8*

2ro

o

RIU

UK

* RII9

10

00

*R

I32

lOO

K

CI2

3.0

11

)'

CIZ

I

-i-

'ooo

...,..

IC

",4

..1

-10

00

CO

T

CO

. R13

410

K

;sl~

TO

TOJS

S2

E

---~

~-lI

EI~j

...,.. I I I I I

__

__

.J

CI4

9Z

.2

,.../

J2~3.~KC

TOr~(E

INPU

T

J>

AU

RA

LR

FIM

PI

RI4

43

90

ill!

RI2

1lO

OK

CIZ

l.0

0

"</H

I•

,101I

"0

'36

100

Ril

e10

K

"'30

lOO

K

CII

•..!

..t-f.

.l>o

"'0

0I

L'

f---

,=

'+U

C1

,.,20

/V

3I

•I2

AT

7

L-.00 r---

----

----

----

----

---I

CI3

8...

J..,.

IOO

O

RI3

1R13~

"'T

"1

0K

10K

:

CI3

9*

I

CI3

4.Ol~

1500

~L

't:

--+

---l

h..

;~~~

::F~

I:.

!V

5'+

140/

12AT7I~

r---

----

----

----

---,

.,....

elle

10

00 .(

RF

SE

RIA

L

DIA

GR

AMO

FM

OD

EL

33

5E

TELE

VIS

ION

MO

NIT

OR

SE

CTI

ON

)

I8

ABO

VE

CI3

3S

'"

CII4 S

@·.00 "'4

-Z6

0.

52

A ~

52

B

*R

II4

410K SC

HE

MA

TIC

CI0

9IS

OO

([)

([)

+.J

OO

RI3

81

00

0

H-J

OO

)

(+2

97

/

01

42

--

,II'

I-t

10001

L2

1:

II

',..oii

~TO

"3A

UR

AL

MO

DU

LATI

ON

'ME

TE

R

L2

03-~.S

...H

RlI

!10

K

RI0

4

.90

0

elll

50

00

RII

22

20

('U

St)

)

RII

O'8

00

el0

5

15

00

J.

Rlo

eS

RII

I:n

o<

}.4

70

(+Z

SO

)

RI0

9 ...

01

""lO

OK

RIO

I2

2

XTA

LI

(IN

OV

EN

)

(+'0

1

r

RI0

2••

00

NO

TlI

:

CO

HD

tT1Q

tl5O

FD

CVO

LTAG

EM

EA

SU

RE

ME

NT

lLI

NE

VO

LTA

GE

AT

II~VotTS.~/60

....

2.

NO

RF

INP

UT

S.I)

..N

NY

ME

TER

LOA

DS

CO

frlN

EC

TEO

4.IM

OD

UlA

TIO

HPO

LAR

ITY

!S

Wfl

tHAT

+PO

SIT

ION

5.P

EA

KM

OrA

A.A

TIO

NIN

DIC

ATO

R(r5

:Q'%

=iio

%'h

CO

NTR

Q..

liTIOO~

6.~TAGESWEA~ED

BE

TWE

ENI~NTS

AN

DC

HA

SS

ISW

ITH

VQ

..TM

ETE

RO

F12

2M

EGO

HM

S"P

UT

RE

SIS

TAN

CE

t(+

25(1

NlI

CA

TE

SV

OLT

AG

ESM

EASU

RED

IN(Y

g]PO

SIT

ION

+2

50

tND

tCA

TES

VOLT

AGES

ME

AS

UR

ED

IN~

PO

SIT

ION

All

CA

PA

CIT

AH

CE

INW

FR

ES

IST,

AH

CE

INO

HM

SU

NLE

SS

OT

t£R

WIS

EN

OTE

D

k.

10

00

OH

MS

M·

IMEG

OH

M-=!

=-•C

HA

SS

IS~"'THODE

O·I

PAN

ELC

ON

TRO

LI

~•I

SC

RE

WD

RIV

ER

AD

J.!

*.A

DJU

STE

OAT

".C

TO

RY

FOR

OPT

IMU

MP

ER

FOR

MA

NC

E.NE~AGE

"'l

U[

S..

-

05

2A

-H

(!)lc".~

~OJ

lil(

]ill

@[I

]lil

t::c

ii!@

..

,a.

'.

CR

'

,'0

0+~V

CZW

~~8

10

00

-----,

~,-

!!!!

-+--

----

---<

~If_

___,

I•

"'"

'~

ISV

'".,.'"

J)~

J:7t

V N11

\R

21

8R

?Z

2)I'

/{rl

10

00

l~

~J

R2

28

®ft

AM

OD

ULA

TIO

N15

0K

IC

ATO

RC

V11

1,

RZ

21

R21

927

01<

RZ

23

RZ

29

10

00

l~

2201

<R

Z0

6

~K

4~~

C21

9IW

+J.

$C

20

9

CR

Z1

00

0C

215

Tt

RZ

"R2O~

RZ

oe

RZ1

5T.02

1-1T

e2

44

111

KR

n..

27

0K

47

K2

20

5Ot'F

t20

K

AU

RA

LC

OU

NTE

R+I~V""­

R23

55

6K

.

R2

37

.6K

R2

42

~R23

9>

00

01

70

0

R'4

OZO

.

t---

-t;\

R2

48

14

4Ii(

+>

00

v

Vlt

B1

2A

T7

c'" ';'1;,r

-~IG'

L-...<

v

027'L-

-:'1

80

0

•S

2G

DU

MM

YM

ETE

RLO

AD

~~

CD

"E:

:,,-

'::.::J

J~

T•

e·

C2

43

r-----l2

)P

ER

CE

NT

MOOUU.TIO~:l

15

00

I-

AU

RA

LC

AR

RIE

R

<D<D

CZ..

.OIJ

,1F

0'6

027

01(

CU

g..~

L16-

Zl1

H,J

(11i

oo--

---

---,

•I

I-l

IM..

...,

.fo~

I+:--~II----4l=!+-'

=I

R'6'

IR'"

I!5

000

IZ

70

KI

,U~

II I

R'7

0

0...

I!lO

OO

22

K48

'1P

fIR

26

66

80

0

Lt:S~H)()MH

L1

5-I

OO

MH

C~~T

T~'

VIS

UA

LC

OU

NTE

R+

10

5V

+--

R2

73

62

00

V1

6B

12

AT

70

,76

lOO

K

02

83

3600

rEX

TE

RN

AL

MO

DU

LA

TIO

NM

ET

ER

®FR

OM

VI

B

R'74f®

.,.00

000

R2

7&

30

K

i••

®0

,84

1140

Yl3

UA

LO

Evt

AT

ll')N

ME

TE

R

A

'\

SC

HE

MA

TIC

DIA

GR

AM

OF

MO

DE

L3

35

ETE

LEV

ISIO

NM

ON

ITO

R(C

OU

NT

ER

SE

CT

ION

)S

ER

IAL

Ia

AB

OV

E

•3

35

E.

1/2

2/5

4S

eri

al

1an

dA

bo

ve'

RB

4

(SE

EFI

G.I2

l

M2

M3

C3

13

C3

06

C30

5

C3

04

FAN

RE

CE

PT

AC

LE

XT

AL

IO

VE

NM

I

l RB

I

(SE

EFI

G.1

0)

T3

Fig

.5

.M

od

el

33

5E

To

pV

iew

wit

hC

ov

er

Rem

ov

ed

Fig

.6

.M

od

el

33

5E

Bo

tto

mV

iew

wit

hC

ov

er

Rem

ov

ed

~AOqVPU-e

Il-e

!.I3

SV

S/2

2/1

3"S

££.

33

5E

1/2

2/5

4S

eri

al

1an

dA

bo

v:e

.

LIB

,

PIO

I

T OC

Ta

RF

INP

UT

S

VIS

UA

LA

UR

AL

C30

R3

16

EX

T

'HT

ER

S~

'1'•

HI-

Z

AU

RA

LM

OO

VIS

UA

L

.,...

R3

01

R2

45

I

Fig

.7

.M

od

el

33

5E

Rear

Vie

ww

ith

Co

ver

Rem

ov

ed

•

VI6

AS

RB

3(S

EE

FI~1I

)

Fig

.8

.M

od

el3

35

EL

eft

Sid

eV

iew

wit

hC

ov

er

Rem

ov

ed

3J1.

oq"

pUl:!

I1l

:!1.I

3S

tS/Z

Z/l

3:S

££

.

33

5E

1/2

2/5

4S

eri

al

1an

dA

bo

v:e

..

R2

45

C2

23

R30

1

R24

1

0316

1V

I2A

B03

17

V7

CI5

1

V8

AS

R21

4R

14

8'

RI4

6..

Fig

.9

.M

od

el

33

5E

Rig

ht

Sid

eV

iew

wit

hC

ov

er

Rem

ov

ed

"Ij .... ~ .... o . ~ o p..

to .... VJ

VJ

\Jl M ~ to en .... en .... o Ii tJj

o III Ii p.. tl to .... III .... ­en

~ tJj -T

'-'-

'©

:I

@@

©I

...L

.._

._.

:•

C2

33

\1.0

1U

F•

.R2

53

",,

27

0K

.T

7f

I•

vv

v•

•R

25

4...

...4

7K

•tR

25

2...

......

22

Kt

tvvv

,,

vv

..,

,•

R2

57

......

...10

0•

IR

25

5A

A8

20

••

VV

V•

•V

y..

,•

•R

25

9...

......

22

0K

••

R2

58

...A

...4

7K

I•

vvv

,•

YV

..,

,•

R2

56

......

...2

70

KI

IR2

60

AA

...2

70

KI

•vv

••

yy

,•

R26

1..

....

.2

70

K•

tC

23

5\I

.OIU

F•

•V

yy

••

II•

•C

23

4\I

.0IU

F•

•R

26

6A

"6

80

0I

•II

,,

yy

y•

tC

23

71

/.0

1J..l

F•

tR

26

4A

...

AlO

OK

t,

1\•

•y

y..

,•

•R

26

7A

"lO

OK

.•

C2

36

\I.O

IUF

•

•V

Vy

••

II•

•R

26

8A

....

..lO

OK

.t

R2

63

A"

56

0K

.,

VY

V1

,y

y..

,,

•C

23

81

/.O

UJ.

F•

•R

26

2...

...A

10

KI

,1\

,,

Vy

..,

•~

tR

26

5..

...6

80

0t

•y

y..

,,

1~

~@

©1

;:lJ

\oqV

pUB

IlBF~S

tS/Z

Z/l

3"S

££

I&J....oz

RB2

u>0

.0<'t:l LI6 LI7C 2}LH 2j.1Hro--ro....

0 0 0'"'UU)

'Ot'It)

"-NN"- I C241-L:LlIt)

rt'lrt'l

0 0

RB3

•Fig. 11. Model 335E Resistor Board Detaij.

,Q) (Q) @ @

,• R218 A A A 1000 • • C206 \11000 •

• "'''' , , /1 •• C208 \I 1000 I • R217 ... A A 33K •• II , • ",V", I

I R220A ..... 270K I • R216 • A A 33K •• ... v ... • I "''''''' •I R221 ........ 270K • • C207 II 1000.I "'''' ... • • 1\ •• C209 \I 1000 • I C204 \I 1000 •

• II • , II •• R219 A .. A 1000 • • R209 • A A 560K •

• vv ... • I "''''''' I

I C205 \I 5 • • R212 A A A4700 •

• /I I • "'''' I

• R213 A A4700 • • R207 ....4700.

• v"' ... • I vvv I

I R211 • A ... 12K • • R204 A A ... 220K.

• "'''''"' • • "''''''' I

• R210 ...... lOOK I • RI47 A A. 33K •I VV ... • • R203 • VA"'AY390 •

Y'"• R208A A A 47K • • C203 \1 470 II vv ... • • II •

I I R205 ......... 270K I • CI50 II 470 •I ... • • 1\ •• C202 II lOOO • I R201 ... A A 27K •I 1\ I • ... V ... •I R206 A ... A 270 K I • CRI t.. •• v,", • I • ." •I R202 A ... A 270 K • I R215 ... A A220 •I VY ...

• I • VV ... •• C 201 1/ 1000 • • CR2 .... •I 1\ • I ,,, •• R243 A ... A 18.4 K I • R240 AAA 255 •I vv ... I I YY I

• R239 ......... 1700 I • R242 A A A 5000.I ,. ...... I , ... v ...

~~ i1

0> Q) @ @1

RB4

Fig. 12. Model 335E Resistor Board Detail

CIl(1)

.~"'.p.l.........

33

5E

1/2

2/5

4S

eri

al

1an

dA

bo

ve

~ .... OQ I-"

\,).

l

~ o 0­

Cb .... \,).

l\,

).l

U1 M ~ Cb en .... til .... o 'i tJj o Il.> ., 0- t:l Cb .... Il.> .... ....

~ tJj

U1

, <0{

}@

@.R

23

7..

....

..5

6K

••

R2

35

....

...

56

K•

IV

Vy

I

~v

v•

IR

313

....

.;.

14.4

K•

b1

Iv

v•

•R

22

7..

....

68

0•

•R

311

....

...2

16,.3

K.

•y

V~

.-v

v.,

I

•R

251

...£

£10

K•

~•

R2

28

......

...1

50

K•

Iv

vv

-.-'"

•V

v.,

I~

f.

•R

23

0..

....

22

K•

•R

22

5..

....

..3

03

0'

••

vV

I•

vv

•0

1

•R

231

A....

51

00

••

C2

18

II

18

00

.~

•V

vI

--.,r

.-to

~'),

at;

-I

..~

•C

R4

1-•

R2

24

..£

A3

03

0.

•..

I1-

TV

v•

•R

30

3..

....

1M•

•R

22

6..

AA

62

K•

,v

VV

II

Vy

VI

•R

23

2A

AA

33

K•

•R

22

9...

......

22

0K

••

vV

V-.

Iv

VI

IC

R5

....•

•R

24

8..

AA

I44

K•

,.....

....-•

IV

VI

*•

C2

24

II11

0•

•C

22

6\I

40

0•

•"l

(T

III

I

•R

23

4A

A'"

120K

••

R2

49

....

...

56

K•

•V

V--.

IV

VV

I

•R

23

3..

....

..18

KI

.C2

27

1/

50

••

vv

•T

1\

I

©(Q

)~

~

(110 ...

o 0

RB6

LII2~H

-0 - q-- -~ -0- -I- 0~

~~ 0

~ :t 0It) ... It)

0 01 ..• It)

~~

:: ::~

~ <l~<l>.. *<l

It) CD 01It)

c;j c;j Cii CD01

(,) (,) oJ (,) 0:

0 - -~ _.-"" -~ -"" 0'---

I--

RB7

Fig. 14. Model 335E Resistor Board Detail

33

5E

1/2

2/5

4S

eri

al

1an

dAbo~e

.-

'rj

,.....

I?t!'~r

tel.

rN17

../6c

f.O

Q

:---

---,

@@

I'<0

>. .....

0)

\.TI

L__

__

. ~ 0 0- ('l) ..... w W \.TI M

::<J tJj

::<J0

0('l

)

CJl ..... CJl

<"t- o ., tJj

0 Pl >oj 0-

r--'-

'-'

t:l!

I®.

@I

1<0

<0('l

)<

"t-

PlL

_._

__

_..... .....

• "

_._.

®@

00

._._

.*

•R

I04

AA

A3

90

0.

•R

13

3...

A'"

10

K•

•....

••

......

•.•

RI0

5A

A3

90

0•

*I

RII

9A

A1

8K

•

'.••

Y•

•••

••

*I

RII

4A

AA

47

0K

I•

R2

46.

..A

A3

00

0.

•Y...

••

v••

•IR

r2

3A

A8

2K

I*'

IR

I26

...A

...

47

KI

,V

.•

•V••

••

CI2

5~r

OIU.

F~

*•

RI2

9A

...

A2

70

I

••

YY

..•

IL

7--

!.O

OIJ

H•

•C

I29

1/

56

0•

,VV

VI

l'

n•

•C

I28

\I.01~F

ITI

CI3

01

/6

20

•I

•II

,,

n•

•R

I24

"'A

..2

7K

I•

R2

72

AA

"1

80

0•

•v

...

••

vv

..•

:CI'2~

.RI1

8A

A..

27

00

.

•V

.y

•*

.R2

86

..A

..1

00

0•

IRI4

92

20

K

•V

Vy

•-'

-'-

@@

00

._._

.

r I L._r . I L.-

t'Ij .... C1

Cl ..... 0'

~ 0 0- ro ..... V.l

V.l

\J1 M ::u

::uro

tJj

rn...

0.... rn <

T 0 'i tJj

0 Pl 'i 0- t:J ro <T Pl .... .....

dAO

qV"p

UB

IIB

1.ld

~Svs

lzz/

I~s££

TABLE OF REPLACEABLE PARTS

CircuitRef.

ClOl

Cl02

Description

Capacitor: fixed, titanium dioxide., 5 IJ.f. ±5%, 500 vdcw

Capacitor: variable, air2 - 11 IJ.lJ.f

-hp­Stock No.

15-74

12 -21

Mfr.'. & Mfrs.Designation

DD

AA#A-llL

Cl03 Capacitor: fixed. titanium dioxide 15 -38dielectric. 1, 5 IJ.lJ.f. ±20%. 500 vdcw

Electrical value adjusted at factory

DDGA-3

......<d....

Cl04

Cl05

Cl06

Cl06

Cl07

Cl08

Cl09

CllO

Clll

CIl2

C1l3

C1l4

C1l5

Capacitor: variable, air.4 - 2 6 IJ.lJ.f

Capacitor: fixed, ceramic,1500 IJ.lJ.f, ±20%. 500 vdcw

Capacitor: fixed. ceramic,2 IJ.lJ.f, -1400 parts/million/degreeC tempo coeff,. 600 vdcw

(25 - 28 Mc crystal frequency)

Capacitor: fixed, ceramic, 41J.1J.f,-1400 parts/million/ degree Ctemp. coeff, 600 vdcw

(18 - 25 Mc crystal frequency)

Capacitor: fixed, mica,820 ulJ.f. ±lO%, 500 vdcw

t· ll

Capacitor: fixed. ceramic,1500 IJ.lJ.f. ±20%, 500 vdcw

Capacitor: fixed. ceramic,1500 IJ.lJ.f, ±20%. 500 vdcw

Capacitor: fixed, ceramic,100 IJ.lJ.f, ±2%, 500 vdcw

Capacitor: fixed, ceramic,5000 IJ.lJ.f, 500 vdcw

Capacitor: fixed. cer amic,,01 IJ.f, t100%, -0%, 500 vdcw

Capacitor: variable, air,4 - 2 6 IJ.lJ.f

Capacitor: fixed. ceramic,5 IJ.lJ.f. ±.5 IJ.lJ.f. NPO Tempo Coef£.500 vdcw

Capacitor: fixed, ceramic,1500 IJ.IJ.f, ±20%, 500 vdcw

12 -10

15-70

14-28

15-70

15-70

15 -22

15-47

15-43

12 -10

15-70

AA#O-25L

LStyle 326

LStyle 315

LStyle 315

v

LStyle 326

LStyle 326

AType S1-19

A, H1-Q Div.Type BPD. 005

A. H1-Q Div.Type BPD. 01

AA#O-25L

A, H1-Q Div.C1-l

LStyle 326

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-31-

TABLE OF REPLACEABLE PARTS

CircuitRef.

C 116

C1l7

C118

C1l9

C120

C121

Description

Capacitor: fixed, air,4-26 ~f

Capacitor: fixed, mica,300 ~~f. ±10%, 500 vdcw

Capacitor: fixed. ceramic.1000 ~~f, ±20%, 500 vdcw

Capacitor: fixed, mica,500 ~~f. ±10%, 500 vdcw

Capacitor: fixed. mica.150 ~~f. ±10%, 500 vdcw

Capacitor: fixed. ceramic,1000 ~~f. ±20%. 500 vdcw

-hp­Stock No.

12 -1 0

14-300

15-68

14-500

14-150

15-68

Mfr . • & Mfrs.Designation

AA#O-25L

VType OXM

LStyle 327

VType OXM

VType OXM

LStyle 327

C122 Capacitor: fixed. mica.300 ~~f. ±10%. 500 vdcw

C 123 Capacitor: fixed. mica.100 ~~f. ±10%, 500 vdcw

C 124 Capacitor: fixed. mica.300 ~~f. ±10%. 500 vdcw

C125. C126 These circuit references not assigned

C 127 Capacitor: fixed. ceramic., 01 ~f. +100%. -0%. 500 vdcw

C 128 Capacitor: fixed, mica.,01 ~f. ±10%. 300 vdcw

14-300

14-100

14-300

15-43

14-23

VType OXM

ZK-1310

VType OXM

A, HI-Q Div.Type BPD. 01

VType W

.en(1)

>-t....P>....-

C129

C130

Cl31

Cl32

Capacitor: fixed. silver mica,560 ~~f, ±5%, 500 vdcw

Electrical value adjusted at factory

Capacitor: fixed, silver mica,620 i-Li-Lf. ±5%. 500 vdcw

Capacitor: fixed. ceramic.5 ~i-Lf, ±.5 i-Li-Lf. NPO Temp. Coef£.500 vdcw

Capacitor: fixed. ceramic.,01 i-Lf, +100%, -0%, 500 vdcw

15-11

15 -12

15-29

15-43

AType 1479

AType 1479

A. HI-Q Div.CI-l

A, HI-Q Div.Type BPD. 01

C133

C134

Capacitor: fixed, ceramic.5 i-Li-Lf. ±. 5 ~i-Lf, NPO Temp,500 vdcw

Capacitor: fixed, ceramic1500 i-Li-Lf. ±20%, 500 vdcw

Coef£.15-29

15-70

A. HI-Q Div,CI-l

LStyle 326

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-32-

TABLE OF REPLACEABLE PARTS

NN

C.ircuitRef.

Cl3S

Cl36

Cl37

Cl38

Cl39

C140

C141

C142

C143

C144

C145

C146

C147

C148

C149

C1S0

C1S1

Description

Capacitor: fixed, air,4-26 Wf

Capacitor: fixed, mica,50 IJ-IJ-f, ilO%, 500 vdcw

Capacitor: fixed, ceramic,1000 IJ-IJ-f, i20%, 500 vdcw

Capacitor: fixed, ceramic,1000 IJ-w,f, i20%, 500 vdcw

Capacitor: fixed, ceramic,,01 IJ-f, +100%, -0%, 500 vdcw

Capacitor: fixed, mica,300 w,lJ-f, ilO%, 500 vdcw

Capacitor: fixed, mica,500 IJ-IJ-f, ilO%. 500 vdcw

Capacitor: fixed, ceramic,1500 Wf, i20%, 500 vdcw

Capacitor: variable, air,1. 5 - 7 IJ-IJ-f

Capacitor: fixed, ceramic.1000 IJ-IJ-f, i20%, 500 vdcw

Capacitor: variable, air,L 5 - 7 IJ-IJ-f

Capacitor: fixed, ceramic,5 IJ-IJ-f, i.5%, NPO Temp. Coef£.500 vdcw

Capacitor: fixed, ceramic,1000 IJ-IJ-f, i20%. 500 vdcw

Capacitor: fixed, mica,82 IJ-w,f, ilO%, 500 vdcw

Capacitor: fixed. titanium dioxide.2.2 IJ.IJ.f, ilO%, Temp. Coef£. +2%of 20 C value over temp. range of-55 C to 85 C, 500 vdcw

Capacitor: fixed, mica,500 IJ-uf, ilO%, 500 vdcw

Capacitor: fixed, ceramic,.01 IJ-f, +100%, -0%, 500 vdcw

-hp­Stock No.

12 -10

14-50

15-68

15 -68

15-43

14-300

14-500

15-70

13-7

15 -68

13-7

15-29

15-68

14-19

15-52

14-500

15-43

Mh' .• at Mfrs.Designation

AA#O-2SL

VType OXM

LStyle 327

LStyle 327

A, HI-Q DivType BPD, 01

VType OXM

VType OXM

LStyle 326

LTS2A NPO

LStyle 327

LTS2A NPO

A, HI-Q Div.CI-I

LStyle 327

VType OXM

DDGA-4

VType OXM

A, HI-Q Div,Type BPD. 01

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-33-

TABLE OF REPLACEABLE PARTS

CircuitRef.

C152

Description

Capacitor: fixed, mica,500 flflf, ±10%, 500 vdcw

-hp­Stock No.

14-500

Mfr.• & Mfrs.Designation

VType OXM

C153-C200 These circuit references not assigned

C20l

C202

C203

C204

C205

C206

C207

C208

C209

C2l0

C211

C212

C2l3

C2I4

C215

Capacitor: fixed, mica,1,000 flflf, ±10%, 500 vdcw

Capacitor: fixed, mica,1,000 flflf, ±10%, 500 vdcw

Capacitor: fixed, mica,1,000 flflf, ±10%, 500 vdcw

Capacitor: fixed, mica,1,000 flflf, ±10%, 500 vdcw

Capacitor: fixed, mica,5 flflf, ±20%, 500 vdcw

Capacitor: fixed, mica,1,000 flflf, ±10%, 500 vdcw

Capacitor: fixed, mica,1,000 flflf, ±10%, 500 vdcw

Capacitor: fixed, mica,1, 000 flflf, ±10%, 500 vdcw

Capacitor: fixed, mica,1,000 flflf, ±10%, 500 vdcw

Capacitor: fixed, ceramic,1,000 flflf, ±20%. 500 vdcw

Capacitor: fixed, ceramic,11 0 flflf, ±2%, 500 vdcw

Capacitor: fixed, ceramic,110 flflf, ±2%, 500 vdcw

Capacitor: fixed, ceramic,1,000 flflf, ±20%, 500 vdcw

Capacitor: fixed, paper,.047 flf, ±10%, 600 vdcw

Capacitor: fixed, paper,.02 flflf, ±10%, 600 vdcw

14-11

14-11

14-11

14-11

14-5

14-11

14-11

14-11

14-11

15-68

15-22

15-22

15-68

16-15

16-12

VType W

VType W

VType W

VTypeW

VType OXM

VType W

VType W

VType W

VType W

LStyle 327

AType SI-I9

ATypeSl-l9

LStyle 327

CC

AType P688

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-34-

TABLE OF REPLACEABLE PARTS

(l)

>oDrooc:ro

CircuitRef.

C2l6

C2l7

C2l8

C2l9

C220

C22l

C222

C223

C224

C225

C226

C227

C228

C229

C230

C23l

C232

Description

Capacitor: fixed, paper,. 02 IJ.lJ.f, ±10%, 600 vdcw

Capacitor: fixed, electrolytic,50 IJ.f, +20%, -10%, 50 vdcw

Capacitor: fixed, silver mica,1800 IJ.lJ.f, ±5%, 500 vdcw

Capacitor: fixed, paper,1 IJ.f, ±10%, 600 vdcw

Capacitor: fixed, electrolytic,10 IJ.f, 300 vdcw

This circuit reference not assigned

Capacitor: fixed, paper,4 1J.f, ±10%, 50 vdcw

Capacitor: fixed, paper,2 IJ.f, ±10%, 50 vdcw

Capacitor: fixed, ceramic,110 IJ.f, ±2%, 500 vdcw

Capacitor: fixed, mica,500 IJ.lJ.f, ±10%, 500 vdcw

Capacitor: fixed, mica,400 IJ.lJ.f, ±10%, 500 vdcw

Electrical value adjusted at factory

Capacitor: fixed, mica,50 IJ.lJ.f, ±10%, 500 vdcw

Capacitor: fixed, paper,1 IJ.f, ±10%, 600 vdcw

Capacitor: fixed, silver mica,1000 IJ.IJ.f, ±5%, 500 vdcw

Electrical value adjus ted at factory

Capacitor: fixed, mica,680 IJ.lJ.f, ±10%, 500 vdcw

Capacitor: fixed, mica,680 IJ.lJ.f, ±10%, 500 vdcw

Capacitor: fixed, silver mica,1000 IJ.lJ.f, ±5%, 500 vdcw

Electrical value adjusted at factory

-hp­Stock No.

16-12

18-50

15-19

17 -12

18-16

17-43

17-42

15-22

14-500

14-400

14-50

17-12

15-57

14-21

14-21

15-57

Mfr.• & Mfrs.Designation

AType P688

XTC-39

VType PW

N#23F467

ZType BTE

P

P

A, H1-Q Div.Type 51-19

VType OXM

VType OXM

VType OXM

N#23F467

ACM30EI02J

VType W

VType W

ACM30El02J

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-35-

TABLE OF REPLACEABLE PARTS

CircuitRef.

C233

C234

C235

C236

C237

C238

C239

C240

C241

C242

C243

C244

Description

Capacitor: fixed. mica,001 IJ.f, ±1O%, 300 vdcw

Capacitor: fixed, mica,001 IJ.f, ±lO%, 300 vdcw

Capacitor: fixed, mica,.01 IJ.f, ±1O%, 300 vdcw

Capacitor: fixed, mica,o 01 IJ.f, ±lO%, 300 vdcw

Capacitor: fixed, mica,. 01 IJ.f, ±lO%, 500 vdcw

Capacitor: fixed, mica,• aI uf, ±1O%, 500 vdcw

Capacitor: fixed, ceramic,1000 IJ.lJ.f, ±20%, 500 vdcw

Capaci tor: fixed, silver mica,1000 IJ.lJ.f, ±5%, 500 vdcw

Capaci tor: fixed, silver mica,1000 IJ.lJ.f, ±5%, 500 vdcw

Capacitor: fixed, ceramic,1000 IJ.lJ.f, ±20%, 500 vdcw

Capacitor: fixed, ceramic,1500 IJ.lJ.f, ±200/0. 500 vdcw

Capacitor: fixed, electrolytic,50 IJ.f, +200%, -10%, 50 vdcw

-hp­Stock No.

14-23

14-23

14-23

14-23

14-13

14-13

15-68

15-57

IS-57

15-68

15-70

18-50

Mfl'.• & Mfrs.Designation

VType W

VType W

VType W

VType W

VType W

VTypeW

LStyle 327

A

A

LStyle 327

LStyle 326

xTC-39

CJ)~'i....P>......)-

• PJ;:sp..

~o<:C1>

C245-C300 These circuit references not assigned

C301

C302

C303

C304

Capacitor: fixed, mica,500 IJ.lJ.f, ±lO%, 500 vdcw

Capacitor: fixed, mica,500 IJ.lJ.f, ±lO%, 500 vdcw

Capacitor: fixed, paper,I IJ.f, ±1O%, 600 vdcw

Capacitor: fixed, paper,6 IJ.f, ±1O%, 600 vdcw

14-500

14-500

17-12

17-11

VType OXM

VType OXM

N#23F467

N22F6

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-36-

TABLE OF REPLACEABLE PARTS

-...... '.<d....;..;~

(J).

{

C.ircuitRef.

C305

C306

C307AB

C308

C309

C310

C3II

C312

C313

C314

C315

C316

C317

C318

C319

C320

C321

C322

Description

Capacitor: fixed, paper,6 iJ.f, ±100/0, 600 vdcw

Capacitor: fixed, paper,6 iJ.f, ±100/0, 600 vdcw

Capacitor: fixed, paper,.25, .25 iJ.f, ±20%, 600 vdcw

Capacitor: fixed, mica,300 iJ.iJ.f, ±10%, 500 vdcw

This circuit reference not assigned

Capacitor: fixed, mica,,01 iJ.f, ±lO%, 300 vdcw

Capacitor: fixed, paper,I iJ.f, ±100/0, 600 vdcw

This circuit reference not assigned

Capacitor: fixed, paper,6 iJ.f, ±10%, 600 vdcw

Capacitor: fixed. ceramic,5000 iJ.~f min .• 500 vdcw

Capacitor: fixed, ceramic.5000 iJ.iJ.f min,. 500 vdcw

Capacitor: fixed, ceramic.5000 iJ.iJ.f min., 500 vdcw

Capacitor: fixed, ceramic,5000 iJ.iJ.f rnin., 500 vdcw

Capacitor: fixed, ceramic,5000 iJ.iJ.f min., 500 vdcw

Capacitor: fixed, ceramic,5000 iJ.iJ.f min., 500 vdcw

Capacitor: fixed, ceramic,1000 iJ.iJ.f. ±200/0. 500 vdcw

Capacitor: fixed. ceramic,1000 iJ.iJ.f, ±20%, 500 vdcw

Capacitor: fixed, ceramic,1000 Wf, ±20%, 500 vdcw

-hp­Stock No.

17-11

17 -II

17 -14

14-300

14-23

, 17-12

17-11

15-47

15-47

15-47

15-47

15-47

15-47

15-68

15-68

IS -68

Mfr.• 8t Mfrs.Designation

N22F6

N22F6

N22F427

VType OXM

VType W

N#23F467

N22F6

A, HI-Q Div.BPD.005

A, HI-Q Div.BPD.005

A, HI-Q Div,BPD.005

A, HI-Q Div.BPD,005

A, HI-Q Div.BPD,005

A, HI-Q Div.BPD.005

LStyle 327

LStyle 327

LStyle 327

*See "List of Manufacturers Code Letters For Replaceable Parts Table. II

-37-

TABLE OF REPLACEABLE PARTS

Circuit -hp- Mfr. * & Mfrs.Ref. Description Stock No. Designation

C323 Capacitor: fixed. ceramic, 15-68 L1000 ~~f. ±20%, 500 vdcw Style 327

C324 Capacitor: fixed. mica. 14-30 V30 ~uf, ±10%, 500 vdcw Type OXM

.

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-38-

TABLE OF REPLACEABLE PARTS

G.ircui tRef.

RIO?

RI03

Rl04

RIOS

Rl06

RIO?

RI08

Rl09

RIIO

RIll

Rll2

Rl13

RIl4

Rl15

Rl16

Rl17

Description

Resisto... : ii:-e:::., ;::o,np':isition,- -. + 0°./ 1/2 ·-1{!,(. OD.L1S, -1, .n, \;

Resistor: fixed, composition,b, eoo ohns, ±10%, 2 'IT

Resistor: fixed, composition,22,000 ohms, ±lO%, 1/2 W

Resistor: fixed, composition,3,900 ohms, ±lO%, 1 W

Resistor: fixed, composition,3,900 ohms, ±100/0, 1 W

Resistor: fixed, composition,100,000 ohms, ±lO%, 1/2 W

Resistor: fixed, composition,1000 ohms, ±10%: 1/2 W

Resistor: fixed, composition,330 ohms, ±lO%, 1/2 W

Resistor: fixed, composition,56,000 ohms, ±10%, 1 W

Resistor: fixed, composition,6,800 ohms, ±10%, 2 W

Resistor: fixed, composition,470 ohms, ±10%, 1/2 W

Resistor: fixed, composition,220 ohms, ±10%, 1/2 W

Resistor: fixed, composition,10,000 ohms, ±10%, 1/2 W

Resistor: fixed, composition,470,000 ohms, ±10%, 1 W

Electrical value adjusted at factory

Resistor: fixed, composition,100,000 ohms, ±10%, 1/2 W

Resistor: fixed, composition,10,000 ohms, ±10%, 2 W

Resistor: fixed, composition,330,000 ohms, ±10%, 1/2 W

Electrical value adjusted at factory

-hp­Stock No.

2:3-22

25-6800

23 -22K

24-3900

24-3900

23-l00K

23-1000

23-330

24-56K

25-6800

23-470

23-220

23 -10K

24-470K

23-100K

25-10K

23-330K

Mfl' . • it Mfrs.Designation

BSB 2201

BHE 6821

BEB 2231

BGB 3921

BGB 3921

BEB 1041

BEB 1021

BEB 3311

BGB 5631

BHB 6821

BEB 4711

BEB 2231

BEB 1031

BGB 4741

BEB 1041

BHB 1031

BEB 3341

*See "List of Manufacturers Code Letters For Replaceable Parts Table. II

-39··

TABLE OF REPLACEABLE PARTS

Circuit -hp- Mfr . • & Mfrs.Ref. Description Stock No. Designation

R118 Resistor: fixed, composition, Z4-Z700 BZ, 700 ohms, ±100/0, lW GB Z7Zl

Electrical value adjusted at factory

R1l9 Re sistor: fixed, composition, Z4-l500 B1, 500 ohms, ±100/0, lW GB l5Z 1

Electrical value adjusted at factory

RlZO This circuit reference not assigned

RlZl Re sistor: fixed, composition, Z4-l00K B100,000 ohms, ±100/0, 1 W GB 1041

RlZZ Re sistor: fixed, composition, Z5-l00 B100 ohms, ±100/0, ZW HB 1011

RlZ3 Re sistor: fixed, composition, Z4-8ZK B8Z, 000 ohms, ± 100/0, 1 W GB 8Z3l

R124 Resistor: fixed, composition, 25-27K BZ7, 000 ohms, ± 100/0, ZW HB 2731

R125 Re sistor: fixed, composition, Z3-l000 B 'w1, 000 ohms» ±100/0, l/Z W EB 1021 w

lIt

R126M

Re sistor: fixed, composition, 24-47K B ,47,000 ohms. ±100/0, 1W GB 4731 .....-Electrical value adjusted at factory [V

[V-R127 Re sistor: fixed, composition, 23-470K B\.}l

~

470,000 ohms, ±100/0, l/Z W EB 4741 (flCD'

R128 Re sistor: fixed, composition, Z3-22 BI-t.....~

ZZ. 000 ohms, ±100/0, l/Z W EB 2231 t-'

t-'

RlZ9 Resistor: fixed, composition, Z4-Z70 B ~

::tZ70 ohms, ±100/0, lW GB 2711 p,

Electrical value adjusted at factory ~0

R130 Resistor: fixed, composition, 23-l00K B <(I)

100,000 ohms, ±100/0, 1/2 W EB 1041

Rl3l Re sis or: fixed, composition, Z5-l0K B10,000 ohms, ±100/0, ZW HB 1031

R132 Re sistor: fixed, composition, 23-100K B100,000 ohms, ±100/0, 1/2 W EB 1041

Electrical value adjusted at factory

R133 Resistor: fixed, composition, 24-l0K B10,000 ohms, ± 100/0, 1W GB 1031

Electrical value adjusted at factory

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-40-

TABLE OF REPLACEABLE PARTS

"Circuit -hp- Mfl' .• & Mfrs.

Ref. Description Stock No. Designation

R134 Resistor: fixed, composition, 23-15K B15,000 ohms, ±10%, 1/2 W GB 1531

R135 Resistor: fixed, composition, 24-10K B10,000 ohms, ±10%, 2W HB 1031

R136 Resistor: fixed, composition, 25-100 B100 ohms, ±1O%, 2 W HB 1011

R137 Dummy Meter Load Assembly 336C -53 HP3000 ohms

R138 Resistor: fixed, composition, 23-1000 B1,000 ohms, ±10%, 1/2 W EB 1021

R139, These circuit references not assignedR140

~

:>0 R141 Resistor: fixed, composition 23-390 B

390 ohms, ±10%, 1/2 W EB 3911

R142, These circuit references not assignedR143

R144 Resistor: fixed, composition, 23-390 B390 ohms, ±10%, 1/2 W EB 3911

R145 Resistor: fixed, composition, 23-1500 B1,500 ohms, ±10%, 1/2 W EB 1521

Electrical value adjusted at factory

R146 Resistor: fixed, composition, 23-47 B47 ohms, ±10%, 1/2 W EB 4701

('I")

('I")

R147 Resistor: fixed, composition, 24-33K B33,000 ohms, ±10%, 1 W GB 3331

R148 Resistor: fixed, composition, 23-680 B680 ohms, ±10%, 1/2 W EB 6811

R149 Resistor: fixed, composition, 24-220K B220,000 ohms, ±10%, 1 W EB 2241

R150 - These circuit references not assignedR200

R201 Resistor: fixed, composition, 24-27K B27,000 ohms, ±10%, 1 W GB 2731-

R202 Resistor: fixed, composition, 24-270K B270,000 ohms, ±10%. 1W GB 2741

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-41-

TABLE OF REPLACEABLE PARTS

Circuit -hp- Mfr. * 81 Mfrs.Ref. Description Stock No. Designation

R203 Resistor: fixed. composition. 23-390 B390 ohms. ±100/0. 1/2 W EB 3911

R204 Resistor: fixed. composition, 24-220K B220, 000 ohms. ±100/0. 1 W GB 2241

R205 Resistor: fixed, composition, 24-270K B270,000 ohms, ±100/0, lW GB 2741

R206 Resistor: fixed, composition, 24-270K B270,000 ohms. ±100/0. lW GB 2741

R207 Resistor: fixed. composition. 24-4700 B4.700 ohms, ±10%, 1 W GB 4721

R208 Resistor: fixed. composition, 24-47K B47,000 ohms. ±10%, 1W GB 4131

R209 Resistor: fixed, composition. 24-560K B560, 000 ohms. ±10%. lW GB 5641

R210 Resistor: fixed. composition. 24-100K B100,000 ohms. ±10%. lW GB 1041

R211 Resistor: fixed. composition, 24-12K B12.000 ohms. ±10%. 1 W GB 1231

R212 Resistor: fixed. composition. 25-4700 B4. 700 ohms. ±10%. 2W HB 4721

R213 Resistor: fixed. composition. 25-4700 B4. 700 ohms. ±IO%, 2W HB 4721

R214 Resistor: fixed. wirewound, 26-25 S15,000 ohms. ±10%. 10 W Type 1-3/4E

R215 Resistor: fixed. composition. 24-220 B220 ohms, ±10%, 1 W GB 2211

R216 Resistor: fixed. composition, 24-33K B33,000 ohms. ±10%, 1 W GB 3331

R217 Resistor: fixed, composition, 24-33K B33,000 ohms. ±10%, 1W GB 3331

R218 Resistor: fixed. composition 25-1000 B1. 000 ohms. ±100/0, 1 W HB 1021

R219 Resistor: fixed. composition, 25-1000 B1,000 ohms. ±10%, 1 W HB 1021

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-42-

TABLE OF REPLACEABLE PARTS

Circuit -hp- Mfl" .• & Mfrs.

Ref. Description Stock No. Designation

R220 Resistor; fixed, c01nposition, 24-270K B270,000 ohms, ±10%, 1 W GB 2741

R221 Resistor: fixed, composition, 24-270K B270,000 ohms, ±10%, lW GB 2741

R222 Resistor: fixed, wirewound, 26-43 Dale Products, Inc.1,500 ohms, ±1 %, 5W #RS-5

R223 Resistor: fixed, wirewound, 26-43 Dale Products,Inc.1,500 ohms, ±1 %, 5W #RS-5

R224 Resistor: fixed, composition, 31-3030 HP3,030 ohms, ±1%, 1 W

R225 Resistor: fixed, composition, 31-3030 HP~ 3,030 ohms, ±1%, 1 W:>00 R226 Resistor: fixed, composition, 25 -62K-5 Broc 62,000 ohms, ±5%, 2W HB 6235t::ro..... R227 Resistor: fixed, composition, 24-680 B..... 680 ohms, ±10%, 1 W GB 6811ro.... .l-<

R228 24-150K~ Resistor: fixed, composition, Bf)

150, 000 ohms, ±10%, lW GB 1541~ .!) R229 Resistor: fixed, composition, 24-220K B"-'.J 220,000 ohms, ±10%, lW GB 2241'.J""'-.....

R230 Resistor: fixed, composition, 25-22K B

~22,000 ohms, ±10%, 2W HB 2231

!)

"'l R231 Resistor: fixed, composition, 24-74 B"'l

5,100 ohms, ±5%, 1 W GB 5125

R232 Resistor: fixed, composition, 24-33K B33,000 ohms, ±10%, 1 W GB 3331

R233 Resistor: fixed, composition 24-18K B18,000 ohms, ±10%, 1 W GB 1831

R234 Resistor: fixed, compostion, 24-120K B120, 000 ohms, ±10%, lW GB 1241

R235 Resistor: fixed, composition, 31-56K HP56,000 ohms, ±1%, 1 W

R236 Resistor: variable, wirewound, 210 -72 G10,000 ohms

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-43-

TABLE OF REPLACEABLE PARTS

CircuitRef.

R237

R238

R239

R240

R241

R242

R243

R244

R245

R246

R247

R248

R249

R250

R251

R252

R253

Description

Resistor: fixed, composition,56,000 ohms, ±1 %, 1 W

Resistor: fixed, composition,100,000 ohms, ±10%, 1 W

Resistor: fixed, wirewound,1,700 ohms, ±1%, 5 W

Resistor: fixed, wirewound,255 ohms, ±1 %, 5 W

Resistor: fixed, composition47,000 ohms, ±10%, 1 W

Resistor: fixed, wirewound,5,000 ohms, ±1 %, 5 W

Resistor: fixed, wirewound,18,400 ohms, ±1%, 10 W

Resistor: variable, wirewound,100 ohms, ±10%. 2 W

Resistor: variable. wirewound,5,000 ohms, ±1O%, 3 W

Resistor: fixed, wirewound.3,000 ohms, ±10%, I W

Dummy Meter Load Assembly3, 000 ohms

Resistor: fixed, composition,144, 000 ohms. ±1 %, I W

Resistor: fixed, composition,56.000 ohms, ±10%, 1 W

Resistor: fixed, composition,47 ohms, ±10%, 1 W

Resistor: fixed. composition,10,000 ohms, ±10%, 2 W

Resistor: fixed, composition.22, 000 ohms, ±10%, 1 W

Resistor: fixed, composition270, 000 ohms, ±10%, I W

-hp­Stock No.

31-56K

24-100K

26-44

26-40

24-47K

26-45

26-47

210-4

210-7

26-3000

336C-53

31-144K

24-56K

24-47

25 -10K

24-22K

24-270K

Mb.• 8t Mfrs.Designation

HP

BGB 1041

Dale Products, Inc#RS-5

Dale Products, Inc#RS-5

BGB 4731

Dale Products, Inc#RS-5

Dale Pr oducts, Inc#RS-I0

I

G, #21-010-357

R, Type BW

HP

HP

BGB 5631

BGB 4701

BHB 1031

BGB 2231

BGB 2741

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-44-

TABLE OF REPLACEABLE PARTS

C.ircuit -hp- Mh.• It Mfrs.

Ref. Description Stock No. Designation

R254 Resistor: fixed, composition, 24-47K B47,000 ohms, ±10%, 1 W GB 4731

R255 Resistor: fixed, composition, 24-820 B820 ohms, ±10%, 1 W GB 8211

R256 Resistor: fixed, composition, 24-270K B270,000 ohms, ±10%, 1 W GB 2741

R257 Resistor: fixed, ~omposition, 24-100 B100 ohms, ±10%, 1 W GB 1011

R258 Resistor: fixed, composition, 25-47K B47,000 ohms, ±10%, 2 W HB 4731

R259 Resistor: fixed, composition, 24-220K B

~220,000 ohms, ±10%. 1 W GB 2241

:>0

R260 Resistor: fixed, composition, ; 24-270K B..0<'d 270,000 ohms, ±lO%, 1 W GB 2741't:lfj<'d R261 Resistor: fixed, composition, 24-270K B

0-4 270,000 ohms, ±10%, 1W GB 27410-4<'d'....

R262:-. Resistor: fixed. compo'Sition. 24-10K B~

10,000 ohms. ±10%, 1 W GB 1031tI.l

~ R263 Resistor: fixed, composition, 24-560K BU')

......... 560,000 ohms, ±10%, 1 W GB 5641NN.........

R264 Resistor: fixed, composition, 24-100K B....100,000 ohms, ±10%, 1W GB 1041

~to

R265 Resistor: fixed, composition, 25-6800 B('/"l

,('/"l 6,800 ohms, ±10%, 2W HB 6821

R266 Resistor: fixed, composition, 24-6800 B6,800 ohms, ±10%. 1 W HB 6821

R267 Resistor: fixed, composition, 24-100K B100,000 ohms. ±10%, 1 W GB 1041

R268 Resistor: fixed, composition, 24-100K B100,000 ohms, ±10%, 1 W GB 1041

R269 Resistor: fixed, wirewound, 26-45 Dale Products, Inc5,000 ohms, ±1%, 5W #RS-5

R270 Resistor: fixed, wirewound, .26-45 Dale Products, Inc5, 000 ohms, ±l%, 5W #RS-5

*See "List of Manufacturers Code Letters f'or Replaceal;>le Parts Table. II

-45-

TABLE OF REPLACEABLE PARTS

CircuitRef.

R271

R272

R273

R274

R275

R276

R277

R278

R279

R280

R281

R282

R283

R284

R285

R286

R287

Description

Resistor: fixed, wirewound,1,000 ohms, i10%, 1W

Resistor: fixed, composition,1,800 ohms, il0%, 1 W

Resistor: fixed, wirewound,6,200 ohms, i5%, 2 W

Resistor: variable, wirewound,5,000 ohms. iIO%, 3 W

Resistor: fixed, wirewound,30,000 ohms, i5%, 10 W

Resistor: fixed, composition,100,000 ohms. i10%, 1 W

This circuit reference not assigned

Resistor: fixed, wirewound,3,600 ohms, is%, 1 W

Resistor: fixed, wirewound,390 ohms, i1%, 5 W

Resistor: fixed, composition,47,000 ohms, il0%, I W

Res is tor: fixed, wirewound10,000 ohms, i10%, 10 W

Resistor: fixed, cOTIlposition,2,000 ohms, i20%, 1/4 W

Resistor: fixed, wirewound,3,600 ohms, i5%. I W

Resistor: fixed, wirewound,540 ohms, il%, 5 W

Resistor: fixed, composition,1,500 ohms, i10%, 1 W

Electrical value adjusted at factory

Resistor: Electrical value adjusted atfactory

Resistor: fixed, wirewound,3, 600 ohms, i5%, 1 W

-hp­Stock No.

26-15

24-1800

26-32

210-7

26-12

24-100K

26-4

26-41

24-47K

26-46

210 -14

26-4

26-42

24-1500

26-4

Mf:r .• It Mfrs.Designation

HP

BGB 1821

RType BW-2

G#21-010-357

8Type 1-3/4E

BGB 1041

RType BW

Dale Products, Inc.#R8-S

BGB 4731

Dale Products, Inc#R8-S

I#37-20008

RType BW

Dale Products, Inc#R8-5

BGB 1521

RType BW

CIl

~....II>...... ,......

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-46-

TABLE OF REPLACEABLE PARTS

Circuit -hp- Mf:r .• IE Mfrs.

Ref. Description Stock No. Designation

R288 - These circuit references not assignedR300

R301 Resistor: variable, wirewound 210-53 G300 ohms, #21-010-358

R302 This circuit reference not assigned

R303 Resistor: fixed, composition, 24-1M B1 megohm, ±10%, 1 W GB 1051

R304 Resistor: fixed, composition, 24-47 B

47 ohms, ±10%, 1 W GB 4701

R305 Resistor: fixed, composition, 24-2200 B2,200 ohms, ±10%, 1 W GB 2221

~

:> R306 Resistor: fixed, composition, 25 -2 7K B0

27,000 ohms, ±10%, 2 W GB 2731

R307 Resistor: fixed, composition, 24-1M B

1 megohm, ±10%, 1 W GB 1051

-'<d • R308 Resistor: fixed, composition, 24-220K B...l-4 220,000 ohms, ±10%. 1 W GB 2241<U

U)

~, R309 Resistor: fixed, composition, 24-1M B

I.!'\ 1 megohm, ±10%, 1 W GB 1051i'-...NN R310 Resistor: fixed, composition, 24-47K Bi'-...- 47.000 ohms, ±10%, 1 W GB 4731

R311 Resistor: fixed, composition 31-216.3K HP

216, 000 ohms, ±1%, 1W

R312 Resistor: variable, wirewound 210-10 I

25,000 ohms, ±10%, 3W #58-25000

R313 Resistor: fixed, composition, 31-14.4K HP14,400 ohms, ±1 %, 1W

R314 Resistor: fixed, composition, 24-1M B1 megohm, ±10%. 1W GB 1051

R315 Resistor: fixed, composition, 24-180K B180.000 ohms, ±10%. 1 W GB 1841

• R316 Resistor: variable, wirewound, 210-79 B20.000 ohms, linear taper

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-47-

TABLE OF REPLACEABLE PARTS

CircuitRef. Description

-hp­Stock No.

Mfr.• 8c Mfrs.Designation

R3l7 Resistor: fixed. composition,100,000 ohms, ±10%. 1 W

24-100K BGB 1041

R318 Resistor: fixed, composition,6.800 ohms, ±10%, 2 W

25-6800 BHB 6821

R319 Resistor: fixed. composition.6.800 ohms, ±10%, 2 W

25-6800 BHB 6821

*See "List of Manufacturers Code Letters For Replaceabl~ Parts Table."-48-

BGB 1011

BGB 5611

HP

HP

HP

SType 1-3/4E

HP

Industrial Prod.GoUG 88/U

HP

Indus trial Preid. Co#4300

HP

HP

BGB 1041

HP

BGB 5641

24-100

M-72

24-560

336C -42

336C -42

24-560K

38-72

24-100K

26-8

38-74

G-76A

G-69B-/

G-69A

335E-60B HP

335E-60D HP

1/<. J'J~-s 212 -GIlA./ u Ar~J..' ,,--

/;V /,ir or //tI'It.~335E:-ll

Resistor: fixed. composition.100,000 ohms, ±10%. 1 W

Resistor: fixed. composition,100 ohms, ±10%, 1 W

Resistor: fixed, composition,560 ohms, ±10%, 1 W

Panel Connector: RF INPUTS

Connector: EXTERNAL METERS

Power Cable:

Crystal Oven: for XT AL-2

Connector: UG 21B/U

RF Coil:

RF Coil:

---I-Crystal Oven: for XTAL-l

R320

L13, C229 Audio Filter Assembly:

R322

R321

R324 Resistor: fixed, wirewound.5000 ohms, ±10%, 10 W

C15. C232 Audio Filter Assembly:

R323 Resistor: fixed, composition,560, 000 ohms, ±10%, 1 W

L2

Ll

CR3, CR6 Crysta! Bridge:

CR I, CR2, Crystal Rectifier:CR4, CR5,CR7,CR8

TABLE OF REPLACEABLE PARTS

C.ircuitRef.

L3

Description

RF Coil:

-hp­Stock No.

335E-60A

Mho.• & Mfrs.Designation

HP

L4, L5

L6

L7

L8

L9

LIO

These circuit reference s not assigned

Variable RF Coil: 60 -1 00 IJ.h

RF Reactor:

VariableltF Coil: 60-100 IJ.h

RF Coil:

RF Coil: 2 IJ.h

48-19 North Hills Electric1l0-G

35F-60D HP

48-19 North Hills ElectricP. O. Box 427Great Neck, N.Y.

110-G

335E-60A HP

48-1 HP

..­......(lj....H4.1

L11

LIZ

L13

L14

L15

L16

L17

L18

L19

L20

L2l

L22

Fl

F2

RF Coil: 2 IJ.h

RF Coil:

Part of Audio Filter Assembly

Reactor:

Part of Audio Filter Assembly

RF Coil: 2 IJ.h

RF Coil: 2 IJ.h

Reactor: 6 h (ciJ 125 MA, 240 ohms

Reactor: 6 h @ 125 MA, 240 ohms

Variable Coil: 3 to 5.5 IJ.h

RF Coil:

RF Coil:

Fan Blade:

Fan Motor:

Air Filter:

Fuse: 3.2 amp.

Fuse: 1/2 amp., 250 volts

Air Filter Oil: 16 £1. oz., includessprayer

48-1

335E -60C

336C -42

911-19

336C :-42

48-1

48-1

911-4

911-4

335-60E

48-1

48-1

314-6

314-13

314-21

211-45

211-20

314-18

HP

HP

HP

HP

HP

HP

HP

HP

HP

HP

HP

HP

HP

T, #31303.2

EMDL 1/2

Resa~archPrnd. CO[p.Ma lson-l0, WIse .•

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-49-

TABLE OF REPLACEABLE PARTS

CircuitRef.

Ml

M2

M3

PI0l

XTAL-l

XTAL-2

XTAL-3

SRl-SR8

SR9

REL-l

SI

S2

S3

S4

Jl, J5

Description

Fuseholder:

Knob: 1" diam.Knob: 1-1/2" diam.Lampholder:

Lamp: 6W, 120 v for PeakModulation Indicator

Lamp: 6-8 v, min. bayonet base

Meter: "Visual Carrier Deviation"

Meter: "Aural Carrier Deviation"

Meter: "Percent Modulation AuralCarrier"

Motor Base Sockel

Quartz:

Quartz Crystal: 4. 3535 Mc

Quartz Crystal: 150 Kc

Metallic Rectifier: 200 MA

Metallic Rectifier:

Relay:

Relay Cover:

Push Button Switch:

Rotary Switch:

Toggle Switch: SPDT

Toggle Switch: SPST

Telephone Jack:

Terminal Strip: 8 term.

-hp­Stock No.

140-16

37-937-11145-5

. 211-5

---112 -44

112 -46

112-45:

38-52

SpecifyFrequency

. 41-32

41-31

212 -85

212 -73

49-17

49-17A

310 -75

310 -114

310-54

310-11

38-10

36-38

Mfr. • & Mfrs.Designation

T#342003

HPHPII, #lOOD

o

o

HP

HP

HP

N#2711

HP

HP

HP

M#1006

M#1014

HP

HP

D#3391-EHP

D82305-B

D

X, #A2A

H, Jones Div.#8-141-Y

-"-N,N

"­Ln.~

en('l)

.~.~--

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-50-

Q)

>o

•

•

TABLE OF REPLACEABLE PARTS

Circuit -hp- Mfr.• &: Mfrs.

Ref. Description Stock No. Designation

Terminal Strip: 2 term. 36-103 H, Jones Div.#2-140-3/4-W

Thermometer: for Crystal Oven 1 41-30 HP

Tl Audio Input Transformer: 912 -34 HP

T2 Audio Output Transformer: 912 -8 HP

T3 Filament Transformer: 910 -102 Sola Electric C o.z..-~#30492

T4 Power Transformer: 910 -99 HP

T5 Power Transformer: 910-103 HP

Tube Shield: 1-3/4" high 38 -28 H, #8861

Tube Shield: 2-1/4" high 38-68 Hugh H. Eby, Inc.Philadelphia, Pa.#9702-19

Tube Shield: 1-15/16" high 38-159 H, #12627

Tube Shield: for tube VI 120 -4 HP

VIAB Tube: 6U8 212 -6U8 ZZV2 Tube: 6AH6 212 -6AH6 ZZV3AB Tube: 12AT7 212 -12AT7 ZZV4 Tube: 12AT7 212-12AT7 ZZV5AB Tube: 12AT7 212 -12AT7 ZZV6AB Tube: 12AT7 212-12AT7 ZZV7 Tube: 12AT7 212 -12AT7 ZZV8AB Tube: 5687 212 -5687 ZZV9AB Tube: 5687 212 -5687 ZZVI0 Tube: 6AH6 212 -6AH6 ZZVI1AB Tube: 12AT7 212 -12AT7 ZZV12AB Tube: 5687 212 -5687 ZZV13AB Tube: 12AT7 212 -12AT7 ZZV14AB Tube: 12AT7 212 -12AT7 ZZV15AB Tube: 5687 212 -5687 ZZV16AB Tube: 12AT7 212 -12AT7 ZZV17 Tube: 2D21 212 -2D21 ZZV18 Tube: 6SJ7 212 -6SJ7 ZZV19AB Tube: 6AS7 212 -6AS7 ZZV20 Tube: 6AH6 212 -6AH6 ZZV21 Tube: OB2 212 -OB2 ZZV22 Tube: 12AT7 212-12AT7 ZZ

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-51-

LIST OF MANUFACTURERS CODE LETTERSFOR REPLACEABLE PARTS TABLE

•

•

Code Letter

ABCDEFGHHPIJKLMNoPRSTVXZAACCDDEEFFHHIIKKLLMMZZ

Manufacturer

Aerovox Corp.Allen-Bradley Co.Am.perite Co.Arrow, Hart and Hegem.anBussm.an Manufacturing Co.Carborundum. Co.CentralabCinch Manufacturing Co.Hewlett-PackardClarostat Manufacturing Co.Cornell Dubilier Elec tric Co.Hi-Q Division of Aerovox Corp.Erie Resistor Corp.Federal Telephone and Radio Corp.General Electric Co.General Electric Supply Corp.Girard -HopkinsInternational Resistance Co.Lectrohm., Inc.Littelfuse, Inc.Micam.old Radio Corp.p. R. Mallory Co., Inc.Sangam.o Electric Co.Sarkes TarzianSprague Electric Co.Stackpole Carbon Co.Sylvania Electric Products, Inc.Western Electric Co.Am.phenolDial Light Co. of Am.ericaSwitchcraft, Inc.Grem.ar Mfg. Co.Carad Corp.Any tube having RETMA standard characteristics

CLAIM FOR DAMAGE IN SHIPMENT

The instrument should be tested as soon as it is received. If it failsto operate properly, or is damaged in any way, a claim should be filed with thecarrier. A full report of the damage should be obtained by the claim agent,and this report should be forwarded to us. We will then advise you of the dis­position to be made of the equipment and arrange for repair or replacement.Include model number, type number and serial numoer when referring to thisinstrument for any reason.

WARRANTYHewlett-Packard Company warrants each instrument manu­

factured by them to be free from defects in material and workman­ship. Our liability under this warranty is limited to servicing oradjusting any instrument returned to the factory for that purposeand to replace any defective parts thereof (except tubes, fuses andbatteries). This warranty is effective for one year after deliveryto the original purchaser when the instrument is returned, trans­portation charges prepaid by the original purchaser, and which up­on our examination is disclosed to our satisfaction to be defective.If the fault has been caused by misuse or abnormal conditions ofoperation, repairs will be billed at cost. In this case, an estimatewill be submitted before the work is started.

If any fault develops, the following steps should be·taken:

1. Notifyus, giving full details of the difficulty, and includethe model number, type number and serial number. On receipt ofthis information, we will give you service instruction or shippingdata.

2. On receipt of shipping instruction, forward the instru­ment prepaid, and repairs will be made at the factory. If request­ed, an estimate of the charges will be made before the work beginsprovided the instrument is not covered by the warranty.

SHIPPINGAll shipments of Hewlett - Packard instruments should be

made via Railway Express. The instruments should be packed in awooden box and surrounded by two to three inches of excelsior orsimilar shock-absorbing material.

DO NOT HESITATE TO CALL ON US

HEWLETT-PACKARD COMPANY

.£a6ora{~ryJTls/rumfll/(/;-jr c4eedanti ](rrllrar'l395 PAGE MILL ROAD '!.!.p PALO ALTO. CALIFORNIA

+4

50

UN

RE

C>

~

R3

30

*J.

1S

0K~

NO

TE

:

REFER

TOVISU

ALSEC

TION

FOR

TAB

ULA

TION

OF

52

SWITC

HP

OS

ITION

S.

+300V-~

R331

V17

ZZ

K

20

21

R3

3Z

THY

RA

TRO

N3

90

K<

~~.~~~-'---------;---:l

TO

T4

~.~~O~_-"----Ii~-..ll--t-i;:;~~;:;;-ol'

C2

04

10

00

R2

06

27

0K

R2

07

47

00

>R

26

61

60

0

RZ

06

47

K

-

LC

24$'

"'-I"

FR

Z0

3~~

39

0

R2

05

.;

27

0K

L-..j-

'>R

ZOZ

<2

70

K

RZ

04

22

0K

C2

0Z

­1

00

0..,

V6

"12A

T7

~;~:':~00i

IF~~

""1

"'T"

47

0_

__

__

_2

CR

Z_

83

.,

CR

I

47

0

RI4

73

3KC

I50

1/

+ 'eR1

48

<-L

C151

66

0S

I.OI~F

'V

V7

812A

T7A

MP

LIFIER

_I.:.R

I46

.......L4

771

<R

14

9<

ZZ

OK

TESTP

OIN

T

150Ke

FRO

MS

20YIN

"CA

LIBR

ATE

"

!

IA

UR

ALI

J6

1 4S

2Dz

~

AU

RA

L

DE

VIA

TIO

N

oIJ

~

i(I

*R

28

6<

10

00

<.1..I

AGC

SA

MP

LE-=-

L-

__

FRO

MM

AS

TER

OS

CILLA

TOR

150KC

:r"­~~~L

:_.J

"'=-

J3

r---

---,I

AU

RA

LR

FI

IIN

PU

TI

lJ

~

+3

00

RI5

0--

+3

00

VR

I314

70

0TO

CI5

6~I~

47

00

CI5

5C

I38

55

1~0~1--)

e~~)f-I~O_

--

--

--,

i=I.gt'~;

CI3

4R

I35

.I.~61:~:

J(1)

Cb~

I.01

fJF4

7K

-=-C

139.01fJF

I

:...-

----C

-l1

4ijltL

23

II

IIO

O~~

II

-=-!

I~~V2

RI2

61

<-=-

IC

I37

ATC

I33I

22

K...1.-

10

00

RI3

ZII.,...

IIZ

lOO

KI

RI3

3"

IC

I47

10

00

<C

R8

...1.-1

00

0

82

.,...R

14

4*

RI3

4I

IZ15K

I

+--_--+----<i~-+-J_

__

-=-J

C324~Z7J

R3

00

1M

~

R3

03

1M

1,

AR2

3Z

*3

3K

C2

23

*j"

FIf

T2~~TIY

TB20t

L.OW~

16

00

l'llG

RNZ

8U

!'111

y­

•R

35

4C

24

933K

.051pf

"l

R2

72

IBO

Oo

R333

~

t52

AX

<L

ti

+3

00

o

r-®--!,,-

--+3

00

VRZ98~

47

CR

14

};99~C

24

7I

I<

47

K..,

l~f

UH

N1

I~.2,!l~"

----L±J~:II~

II-,'

IIf-

'-.I~

----

TV

MO

NIT

OR

(TY

PE

3)

33

5E

1lZ45'1::_'"

10

K

MO

DE

L

*RZ

40

<2

55

C2

08

10

00

-

II

<R

23

54

9K

+3

00

R2

36

10K

RZ

I415K

<;R

ZI5

2Z

0

+3

.5

C210

L10-1f-I~~

3.3J.LH1-

--,

\::~"

I.~~:~?"\l~,-.L

'~25V

r@3 5

I•

CR

3I

INP

llT2

30

30

6C

4

I{lG

RE

EN

\L

IT

l*

IR

Z9

2

lt

R2

ID

OllI

,-660-750fJ~

05

3:11

4C~18

I6

.",,,'"

.--

~'---

".'00'

I.

-""

~5biTC

214-

I•

I."'.'

'"''

e2

16

r::-lR

352~

39

I

""1

I'".'''p'

~,roo~

•/~

V11

A

""

,rooliB

""'

56

81

10

00

I2

02

I,02

ZW

--

ISO

LATIO

N

I

CZ

44

IR

Z2

9A

MP

LIFIER

=50fJF

_IZ

OK

\

I""

I-

'"ro

'"

LII

15

00

+""

''I'"1

""

I""

,,,,'~~'

"""

+I

1"O

M.."

",,

-,,'

.",

__

_-.l

'"~"'"""<"'~'

'"-

--

---l

W,,'

'"''=

/V

12~

.'1W"",....'W

-.....W.4L

56

87

,,~.'0

0

CU

RR

EN

T4

70

REG

ULATO

RP

ZZ

7 47

*®

-"G

RID

-R

24

6C

UR

RE

NT

-R

25

1lO

OK

SA

MP

LEFR

OM

2Z

KV

2AT

RI07

G-

=

>R

21Z4

70

0

>>R

20

9>

56

0K

-=-~PARTOF

T8Z01

RZ

IOi

lOO

K

CO

PY

RIG

HT

19

60

BY

HE

WL

ET

T-P

AC

KA

RD

CO

MP

AN

Y

Tt'!i5

dra

Win

g'$

Inte

nd

ed

for

Theo

pe

ratio

n

and

mO

lnt"n

on

CI

ofH

ewletl-P

ackard

eq

uip

­

me

nt

an

dIS

no

tto

beused

olh

erw

lleO

r

rep

rod

uced

w'th

ou

lw

,ttte"consent

at·th

e~e.lett

-Pa

cka

rdC

om

po

ny

335E-AUA~T"'PE

2B

-=-

Use

'V.

.htJ'

/"<

7/)

7/7

6d

'c-/l

Of

Bo

ofr

-_.

-----U

5lb n ;' .- <

":so

"'0U

NR

EG ~~ OQ

Rn

o"$

lbl~OK

t-.J

t-.J

.--v

Y'r

A3~1*

22

'

t30

0V

-

NO

TEII

Tl-\

jlO

ClR

O;tT

5SH

OW

NC

ON

f.EC

TED

FOR

9P1

NT

Rl1

f.lS

fOR

l,l(R

~Tl

isj7

"PlN

m4NSF~u£~.

C22

1IS

(JM

I"E

OA

ND

e218

ISN

Al,.

TE

RN

UE

POsm

o...

S,.,O

""N2l

RE

FtA

TO\ll

SUA

LSE

CTI

ON

FOR

TAB

uLA

T,O

NO

F5

2SW

itCH

POSI

TIO

NS

VI7

,",F

RO

M2

02

1T

4,D

rNe

.r+

'TH

YR

ATR

ON

TO

TO

­R

31

12.

16.3

~F~

•

".,P

IN9

5--,

;~~~

~~_1

-,-:

-=1_

~1l

C2

0.

10

00

RlO

?4

10

0

Rlo

eR

Z0

6"7

1(

Z7

0K

R2

05

,"'.

IlZ

02

,,"<

C20

11

00

0

C2

02

10

00

C.'

V6

IZA

HR

lOI

AM

Pli

FIE

Rn

< If·mtt~~~

41

0V

7B

12A

HA

MP

LIF

IER

RI4

6...

....~

~--- ...~h".

680p.O

'"F

T£ST~OIHT

I~KC

'RO

MS

20

,

""1~.,

"IN

"CAi

...lB

RA

T["

2l0

1(

~1

80

0

! ~R'''9

!"0'r;,

:;,)

33

.~I~C$~~~

22

01

(C

15

0

TO so

AU

RA

L

.J:Cb(b~~ 52

0,

~<C

-.,I I I

1'13

1

IAUR

ALIH

i

~~.."

..-

-U

A•

.,,,

S2

Bv

'30

00

C2

25

'70

~.

.JQ

OT

Tl

T-

.'O

OV

r---

---,

IA

UR

AL

Rf

,I

INP

UT

IL

JJ3

AG

eS

AI.

lp\'£

~L

-_

~RO'

"M

AS

TE

RO

SC

IlL

AT

OR

"---

--

3: 8. lb .-

"2

72

11

00 'A

"l

-+

30

0V

R3

03C~a

,M2

7

1a

lB

I"'8fu

AiJ

ER

NA

T£

22

00

CA

l"P

Osm

CN

+1~5V

C2.

....

Rlo

a'y

F,.

=<:

'ZO

OI~

Vll

A,.

C2

23*

/'

56

67

Iy

Fo

ISO

lATI

ON

f-

-:;IA

MP

UF'

IER

Rll

9I 'r

--!

12

0K

..2

.12

-~

C2

20

eft

•".

II

..L

....

..L

~:II.

.-<n-l

U4.

====

--r---

1I

IH

~5

0.,

F~

R~~O~

:?1

0",

'e

22

2C

25O

"~R

Z)4*

Rno

R2

)'l~

,.<~IOO

T"""T

1201

(

C1

08

'00

0

. An~ '0'

RZ

l..

".

+JO

O

"3

.S

....,'" """

'----- J..

~~:

~::~~

C2

10

LlO

--)f-'~~

--

--

--,

1.3~

I~rc

:lI'

~~~~

EReft

]I

INPU

TI

'lGPE

E,..

\I

OO

Td

Olit

N

I>~'-::-"-::-,,-<>+-+-".,..."f1lT'o"""~_

_,,,,,

I~

IC,

-. tI

I\I

V\.

I'fI

5.O

~I..

,f

•2'O~

I1

00

<1..

'I

I

-=-~'O,

I.,

,,I

5l.

1l

I~OO

CllZ

I,q~

"JO

tA

lII

33~1

110

IiU

MB

Al.

AN

CE

_--

'\N

'v--

--.+

-_..

--J

tZK

II

INP

O'#

fEq

SU

PP

LY

_I.:.,.

Vll

B__

____

__-±.

I\

56

67

~---

JCAT~or~~~~'o.

.".

./".

TII'ctl~

TOf:n'

lOll(

ItJ7~

Al"

6n.'T"-~__..=---.--_<>I

R21

5lO

OK

R2

20

{£]S

fTM

lTO

~"=

"

RU

t-

~~B~N.lTE"

~-=

""1

50

0-<

Alt

BR

AT

["3

5fi\.

------

-ARl

'l_C

OP

YA

'C;H

T1

'60

ITH

(Wl.

[TT

-fI'

AC

KA

RD

CO

"'A

H1

'+

------.

...--'

\NIr

---'

\M((

Xl

T[5

TE

Oul

PR

EO

'o-

~00

0~T

illi

iIlt...

..'

,.,..

'...

..4

for

III.

....

..1'

0..

•INT

Tl":'"

-

...iI

l_,"".~""

...u

.f"-..,Il-~."f'

~'h.

"l"O

~l4~

"',"

",."

",I.

fOOt

10h

y..

..01

11".

'11

'fl~~

~_

.=l

f.",

'wc~

iIl

.,111

...,

."ll

ltll

c,"

Mn

l.,

III~

10

k..

...I~I

I-Po

c..

'iIl

C_

,I."

",n

S(·&

UII

·u-t

rI

~0

0

Fig

ure

4-1

4.

Au

ral

Cir

cu

its

C;.

)C

;.)

c.n rn

I~

~

"

-~=~-:,--_

..~~_._--

til

(l)

(') .... ..... < '"0 ll)

(Jq (l)

N o

CR

15

~g~~

~gg

s~:;

;Ycr

.~P

-for~-r

_'

1\Or

c.."...

..J,o

r~'

T'C'

r'/~

.~·J

·

Rl0

43

90

0

AG

eS

AM

PlE

TO11

12AT

S2

8y

Rl5

9..

.l-

C\6

62.2~

,*,o

02

IJF

A(,.

eU

"l£

R15

8'* .8. R

151*

41

.RIO

I2

2

RI5

6"0

6<.

tOO

K

"

MO

DE

SU

PP

RE

SS

OR

CO

f''l'I

lIOK

TlM

On

MfW

lm.'

AC

IJt,

lDco

""..

.....

,

TWo

01

"";"

.I.

I..

,I

,......Ie

......._....-

-'-".

,..,..

......

........-'

.--

..,_

....

.~.,,~_

ao..

....,.'

....

~_.,...

....c._

,.'1

".1

1'''·

('

Fig

ure

4-1

2.

Mast

er

Osc

illa

tor

3: 8- (l) -

til

ro n .... < 'tl

IlJ 0Cl ro N .....3: 8­ ~ C

o;)

Co;

)(J

l

t'Il

RI2

7

41

0K

,)0

(,5

20

,

I!lO

I(C1

0

~N~~

I:R~

t£~

J4

---,

[~s~~J

-r:r~

~2~

om

o MI

IO-(

)-6}

1A,l

8OO

nl

+

V4

2A

T7

ER

/OS

CC

131 ,

·,2>1

\1

00

0

52

C.

R12

0*lO

OK 5Z

8.

el2

3.0

1",,"

Ql

r R29

",'l_

_J

INT

[RC

AR

RlE

:R

50

0,.

/o£

v.

AD

JuST

V\I

\r---,

r~55

.F

l29

3

27

00

55~

o!,

NT

ER

-CA

RA

te"I

oIA

UR

AL

C""U~IEA

I

Ra

l14

.51<

4.3

5lI

le

....­ I I I IC

I"'.

~IOOO

r-----'

IV

ISU

AL

FIr

IL_~~!..._J

IL<

I<

0­1

00

I

-"I \~~~

~-'

- ....-C

R7

I I I I_

_...

J

3R6~1

00

.._

SE

Tlo

llTO

ZER

OIN

-US

E-

...R

Z82

:W

ITH

3.~C

RZ

79

'00

0A

PP

\JE

O1'

0Jl

'90

C2<

412

00

0

C2

<4

02

00

0

R2

6i

.50

00

CIl

Z'7

0

Fll

83'I

36

00

I I I I I

------

-.r--

J

J.

R2

81

*3

60

0

R2

10

50

00

Rl2

1 ."

R2

80

'7K

--

--

--

---l

I I I I I

Vis

ual

Cir

cu

its

Rll

61

0K

Ru

e3

60

0

cn

,1

'00

VI5

56

87

AM

PlI

fl[R

V3

~C

12

.2

10

"II'

IIZ

AT

71

00

_M

Ull/

MIX

ER

~~Z~

~~ci

I I I I I I I L

Fig

ure

4-1

3.

G)

RU

,6

80

0C

23

1.0

1y

F

ell

S

10

00

----

---1

1f-

­I

IoIULT~t~L

O~IVE

I1

0v~

A1R

t!)?

I

1.C

I33

:,

I I I

C~.

:

•I I

CII

Z.O

l..,

f

Rll.

47

0K

R2

7,

'OK

PA

RT

0'-

')~

C2

3·

0"" A2.

61Z

70

K1R

26'"

lOO

K

R1

59

>>

A2

63

2201

(>

>5

60

1(

C2

36

Ot}

.lf

AI"

CI4

2<1

00

01

!l0

0

L'

o

'30

0V

--+

,I

C23

5...J

...<

R2

6O

­.o

1...rT

<2

70

1<

CIO

'l1

50

0

""<>I'f

AlI

3 ..'

R2.

511

00

A2

56

"2

5'

'70

'V

I3."

12A

T7A

MPU

FIER

e2

33

.01..,"

~~~~t~~.

,•

ATS

2A

,

ClI

OD

RIV

EfR

OM

100

OS~I~~~\~R~

--i(

,I~

R2.~4

."

RZ

S5

02

0

c..

<>

)lf1

-

"t5

2'ZK'~'-I1

1iJ

III.

·:'~~.::.:,mml I I

c."\

1000~

S2

A-O

fufr

fCT

lOH

SElE

CTO

R

HO

T[:

(3)

ICA

LIB

RA

T[I

<Z

iG]

~§]

@[T

I

CDIC

AR

RIE

RLE

VEL

I

\: '".; ~ I',

no

CP

S,,

[..[

CT

ION

fIL

l!"

,_

-._...

__

1_

.•.._

......_

-__--

----

-,._

"--

"r.........

_'.

_.

c.,...

....

I"",

.'

....lllf·"~(•••

OC

O."

.""

n~

B

CI5

2.0

0

It'4,

ZZ

OK

ISO

1«TO V..

C,..

.01..,'

__

CIZ

I

I.~I

""

(,.u

)

A'4

73

3K

CI5

0>

00

""OI-j~

V7

BIZ

AT

1

LT .00

.....

fIl1

4.

'.0"12

5'0

00

'12

0ZT

K .\.. 4T * ,un

'000

S2

0

VIS

UA

LC

AR

RIE

RD

EVIA

TIO

N

Ril

l*

27

00

RI2

3.2K

VIS

UA

LC

OU

NTE

RIt

I...L

IO

UTP

UT

"II' 1>00

*A

I5Z

'000

<

;S>

{!?

TOTO

.15

StE

c•• 1t

134

'.._

C14

'7ICS

T--

iOO 0

1HI~J

1000

'

...3,'

Ke

TOr:

:to

EIH

PUT

~(

+(IU

.01.

"

[!II

("'I~a

(-6

)

:::14-2

11~~~z

C1l5~

~llOO

LO

,""oT

L3

l----,

oo-o

oo-

V3

I""

-""1

0/1f7

•I~

I I 1 I I I 1 I I I L·~oo r---

----

----

----

I---

I.,

,\----I

C".

'OK~

•~.

"...

..'0

00

tOK

-r

CI3

9..

---.

.,r-

----

----

----

-!

......I

...,..

.C

IlI

"121

Ito

OO

Ril

llO

OK

tlU

I1

0K

30

0

I1

/I I I I I I I

C1r

el3

4...

L..0

1...

'-=

..Lc,

••h

LZ

>'_

.:;;I;

L'

"'M"

-r.2

el3

6(+

24

0/

.0

C'3

3, liA

nI

,•

*'z4(

))

•I

.-"

....I 1 1 I I I

...-I

0..!A

II'L

4~2'

-,

fi~,

/07

·d·

~·1

-0/1

;;...r

rl,

r~/-/r

(/(

11

:.r~~

R'0

4..0

0//,

?/$

('''t

'''..

1"K

'-("r

'7

C/O

WI'#

'

i!"r,

•

tIO

T11

1

CO

HD

tTIQ

HS

orO

CY

Ol.T

A,G

fM

EA

SU

RE

ME

NT

lLI

NE:

VO

lTA

GE

AT

lI:~

VO

LTS,~/60

....

2.N

OR

'IN

PVT

:1c:

u.rr

WET

ERLO

AO

SC

ON

NEC

TED

4,IM

OD

tA.A

T1O

HPO

LA

AIT

Y]

SW

fTtH

AT

+PO

SIT

ION

'-P

EA

KM

OD

ULA

TIO

NIN

DtC

AT

OR(~)

CO

HT

M.tl

,1J

.fJC

:JO%

..VO

LTAG

ESKA~EO

BE

TWE

EN

lOC

AT

ED

PO

INTS

AND

CH

AS

SIS

wrr

Kva..T~TER

OF

122

ME

GO

HM

S"P

UT

RE

SIS

TAN

CE

t(+2~

N;)

K:A

T£S

WlT

AO

EI

"E"'S~£O

tH@

g]PO

SIT

ION

.+t~

,.O

IeA

rts

VO

lTA

GES

MEA

SURE

DIN~

POSt

TIO

HA

U.

CA

PA

CIT

AH

C£

INW

'R

UIS

TA

HC

EIN

OH

MS

UH

LLS

SO

fHE

IIlW

IS[~D

It.

'00

0O

HM

SM

•I-

..EG

O...

-4:-

•CH

AS

SIS

~.THOOE

O·I

PAN

ELC

ON

,..,.O

LI

(i

•Ii

dE

WD

RlV

ER

...o.a

.l••

AO

.-JS

TtD

AT'.C

TO

AY

r04i

'O

PT

'"'''

'P£

"FQ

RlM

HC

I:.

1tIf.~K.(

\aL

Ul

-

/+,D

O)

*22~K

s6ic-

CIO

'-1

..39

00*

ISO

OJ

RI3

8R

II4

\1

00

0'l

llK

('1

'Z9

7)

(+1

3O

)C

I42

(~

ISO

OJ

L2

Ria

l"0

<1

Rlo

ev

Ril

l2

.'O

OK

33

04

10

ISO

I

"IZL

.O1

20

3-5

.5.,

H

'<#'

30/

AII

5'O

K

~)

J=~

..L

CIO

t

RI0

2X

TAL

I

~=I

T,.

oo

11

00

UN

OV

EN

)

TOM

)

OU

'''L

MO

DU

LATI

ON

•...

TE..

I;

<D1

S2

B

Io

S2

A-H

<DIC

..."

.L

LV

EL

)

.~D(J

(!)

O]

lS2

AI!)

..~oo

a>[]

!!)

@D

]

(!)

a>

Ci)IC

OL

'.'O

TE

'

<D

SC

HE

MA

TIC

DIA

GR

AMO

FM

OD

EL

33

5E

./

T~I

~\JI~lnP,,1

un

"UT

no

(RF

SE

CT

ION

)

SE

RIA

LI

aA

BO

VE

e2

2.

"0

IIt!z

,,(

~\,

"j''t

!\,

~)

I'/

TI

~

®T'

OPu

!¥

OO

\A..

AT

I()N

f,ol

CA

TQ

RII

I11

)

/

VIl

Bt2

AT

7

C2

2ll

'UF

,J~_

A2$

1H

I.Z

'0<

t•

+-]

Q()

V

~:~~~~

•>

00 R

24

8'4

4K

ItZ

ZII

100

<

CZ

l9'W

I"'

HE

RII

~Z26-LC227

40

0..

..'0

@---

-<!)

FRO

M~

.R

U6

FR

OM

....~

Vl2

B

56

87

1..

*rIJ

I"Y

.

~~

~r:oZ ;

4em

R24

3R

24

'1

8••

ItS

OO

O

R2

40

2»

R2

39

11

00 ...

R2

37 ...

+10~V

AU

RA

LC

OU

NTE

R

'-'.~

C2

0e

V9

A~

Cli

O

®Q

20

'00

05

68

7L

lQ'2

UH

10

00

------,

B""

'.-

~~.-

"'''

VS

A42

VP

PC

2"

te2

1]

22

0IC,

47

00

~60

I('H

OO

9,~

"if

IV

6A

V6

B~~

V7A

~:;

1,..,

..A

i"2:

!t'

O*

'00

0'5

0~t2

AT

1C:

~R

21e

1,f

tOM

R20

1•n

$12

AT

1'1

2A

T7~

---

'00

0l~OO

..,

"1

12

7..

...

,•

',....

C2

01

\~'

11

~'fO

....,I'

'"1

00

0~~

':....

..-

...2

IIf

,1

1l

\~"o

V9

BI

IR

22

1;'

~5

68

71

IR

219

27

01

(

If~

\I

Rzz

"I

.00

0'5

00

I....

CR

tI

)I

<..Z

TU

II:11

VV

"',

I•

1'0

00

>,'..-

~'+

''-1

L".

ZU

Mj

I._.

.-

4Z

V",

.I

CR

lI

LI

IL

Lr-I

C2

09

L_

__

_....

__

.....J

tOO

O

j"

'"

,U

n•

+3

00

V

.}S

2G

@R

27

21

80

0

oF

RO

MV

I8

",",,~Y

WE

TER

LO

AD

J1

vl3

UA

LQ

(V1A

TI(

)frI

IW

ET

ER

02

83

'60

0 0­ ..0i

'6.®

"26'

.60

<

0211

1'60

0

R2

18

36

00

R2

7S

""K

02

60

27

01

(

"20

22

,.

VIS

UA

LC

OU

NTE

R

®s..~

IloC

""'"

..

SC

HE

MA

TIC

DIA

GR

AM

OF

MO

DE

L3

35

ET

ELE

VIS

ION

MO

NIT

OR

(CO

UN

TE

RS

EC

TIO

N)

SE

RIA

LI

aA

BO

VE

\'

I

1,t~

HEWLETT-PACKARD COMPANYJaboratory Jnsfrumenls fir cfpeedandAccuracy

395 PAGE MILL ROAD, PALO ALTO,CALIFORNIA

PHONE DAvENPORT 5-4451

April 16, 195,4

Station W S L IStandard Life Blc Co.Jackson, "Iississippi

Purchase Order No. 73509

Gentlemen:

We are enclosing the following instructlon manual (s)due on your Purchase Order No. EC-32177-4

Model No.

335E

Serial No.

15

This data was not shipped with your order for the rea­son checked below:

( ) 1.(X) 2.

( ) 3.

Manual temporarily out of print.. Shipped preliminary book pending completion

of manual.Manual in process of preparation.

We regret the delay in completing your order and hopeit has not inconvenienced you.

Sincerely yours.

HEWLETT-PACKARD COMPANY

Edward F. DotenInstruction Book Department

EFD/bcEnclosure,

-hp- MODEL 335E

FREQUENCY MONITOR AND MODULATION METERFOR TV BROADCAST STATIONS

ADVANTAGES

* As sures that your transmitter is withinFCC specifications for frequency accuracyand degree of aural modulation.

* Operates reliably, accurately over longperiods of tIme.

* No adjustments required during operation.

* Indicating meters can be remotely located.

* Compact size, requires minimum rackspace.

* Available in special finishes to match yourtransmi tter color scheme.

* Covers all TV channels, 2 to 83.APPLICATION

This new -hp - ins trument mo­nitors the car ier frequenciesof both the aural and video TVtransmitters, and measures thedegree of aural modula ion. Noadjustments are neces ary dur­ing operation, and because theaccuracy does not depend on atuned circuit, it is not necessary to re-set the carrier level or re-align circuits.The instrument is specifically designed to operate without adjustment week afterweek. It gives continuous indication of broadcast frequencies and aural modula-

ng level at all times D and assures that your transmitter is operating withinFCC specIfications.

DESCRIPTION

The -hp- 335E includes provIsion for operation of remote indicating meters aswell as a remote peak modulation Indicator lamp. The percentage modulationat hlch the lamp flashes a warmng is adjusted on the front panel.

An audio output signal D provIded for me asurement purpos es, has residual dis­tortion of less than 0 25% and the noise level is at least 70 db below 100% modu­lation at low frequencIes. Frequency response is flat wi thin 0.5 db of standardde-emphasis curve. 50 0 15,000 cps. A demodulated signal for remote or localaural monitoring is also provided at least at a 0 VU level.

-hp- MODEL 335E

SPECIFICATIONS

Aural Frequency Monitor

DevIation Range:

Accuracy:

Aural Modulatlon Meter

Modulation Range:

Accuracy:

Page 2 of 3

+6 kc to -6 kc TIlean frequency deviation.

Better than fl. 000 cps for at least 10 days.

Meter reads full scale on TIlodulation swing of 33. 3kc. Scale calibrated to 100% at 25 kc swing; 133%at 33.3 kc swing.

Wi hin 5% TIlodulation percentage over entire scale.

.•••

MeterCharac eristics:

FrequencyResponse:

Meter daTIlped in accordance F. C. C. requircTIlents.Reads peak value of TIlodulation peak of duration be­tween 40 and 90 TIlilh seconds. Meter returns froTIlfull reading to 10% of full value within 500 to 800TIlillis econds.

Flat within ±1/2 db froTIl 50 to 15,000 cps.

Modulation Peak Indicator

Peak Flash Range: FroTIl 50% to 120% TIlodulation (25 kc = 100%).

Video Frequency Monitor

Deviation Range:

Accuracy:

Audio Output

+ 1.5 kc to -1.5 kc TIlean frequency deviation.

Better than ±500 cps for at least 10 days.

Frequency Range: 50 0 15.000 cps. Respo se flat Wlthin ±1/2 db.EqUIpped wIth s andard 75 TIlicrosecond de-eTIlpha­sis cIrCUIt.

DIstortion: Less han 0.25% a 100% TIlodulation.

Output Voltage: 10 01 s into 20.000 ohTIls at 100% TIlodulation atlow frequen ies.

Monitormg Output: 1 TIll.lliwa in 0 600 ohTIls. balanced, at 100% TIlodu­la ion. a low frequencies.

Residual Noise: At least 70 db below output level correspondmg to100% TIlodula ion at low frequenCles.

-hp- MODEL 335E

General

Frequ ncy Range:

R.F. Pow rRequired:

Ex ernal Me erIndlca lon:

Size:

Power:

Price:

Page 3 of 3

Channels 2 to 83 inclusive. mcluding offset channels.

Approxlmately 2 watts.

External meter indication aval1able for aural car­r:er devla ion. vldeo ar ler devlahon. aural modu­lation percen age and peak lndication.;;... v

.-..,l:*..p'J"'t" high x 19" wide x 13'1 deep - for rackmounting only.

115 V lts. 50/60 cps, 180 watts.

$1.950.00 Lo.b. Palo Alto. California.

ABO E DATA SUBJECT TO CHANGE WITHOUT NOTICE

HEWLETT-PACKARD COMPANY395 PAGE MILL ROADPALO ALTO. CALIF.

2/27/53

PROCEDURE FOR REPLACING THE THERMOSTAT IN THE M-7CRYSTAL OVEN OF TFJE HEWLETT -PACKARD MODEL 524B AND MODEL 335E

The crystal oven contains a thermostat to mainta1n a constant oven temperaturewhich 15. within ±2 00f 65 0C. If the temperature indicator is not in the green region,the thermostat has probably failed. The installation procedure is given below.

Component

OvenThermostat for 524BThermostat for 335E

REPLACEMENT PROCEDURE:

L Remove the instrument case.

-hp- Stock Number

G-69B310-12941-5

2. Unscrew the 3/8" nut on the temperature indicator shaft between thefront panel and the crystal oven.

3. In the Model 524B remove Z 202. Twist the two L shaped clampshafts (next to the tubes) 1/2 turn counterclockwise and pull out thecomplete assembly.

4. Remove thermometer.

5. Remove the four 6-32 screws, under the chassis, which screw intoeach corner of the crystal oven case.

6. Remove the crystal oven top by lifting it directly away from thechassis.

7. Remove the two 6-32 screws, in the lip of oven top, which hold thebanana plug block. This loosens the block and makes the following stepseasier.

8. Inside the crystal oven top is an aluminum casting which has a hole inone corner. The thermostat is located in this hole and is removed bygently pulling the wires which enter the hole.

9. Note the position of any springs fiber tubes, or insulating coveringson the thermostat base. In the Model 524B there is a sprtng between thebottom of the hole in the casting and the thermostat top.

10. Unsolder the thermostat wires from the banana plug block.

lL Tra sfer the springs, etc., noted in step 9, to the new thermostat.

12. Install the new thermostat and reassem.ble the oven by reversing theabove instructions.

7/29/54

•HEWLETT-PACKARD COMPANY

\ r'

~

~

395 Page Mill Road -Palo Alto, California;,

M-4

CA UTION

READ BEFORE TURNING ON THE INSTRUMENT

INSTALLATION OR REPLACEMENT OF THE MERCURY SWITCH CONTACTTHERMOMETER OR THE CRYSTAL OVEN IN THE HEWLETT-PACKARDMODELS 100B, 100C, 100D, 335B. AND 524A.

The heating of the crystal 'oven in these instruments is regulated by a mer­cury column switch in a contact thermometer. Occasionally the mercury columnis separated by jarring and vibration of the unit in shipment.

Three types of ovens have been used. These are described below. Thisprocedure is written to include directions for these three types, with suitabledirections for each type separately where necessary.

Type 1: This type operates at approximately 55 0 C. It is bolted into theunit and wired directly to the other components.

Type 2: This type operates at approximately 65 0 C. It is self-containedand plugs into a socket.

Type 3: This is the same as type 2 except that it is assembled differentlyand requires a different procedure when replacing the contact thermometer.

After turning the instrument on for the first time, keep a close check onthe temperature of the crystal oven as indicated by the thermometer in the frontpanel. When the instrument has been on about 30 minutes, the crystal oven shouldremain automatically at a rather constant temperature. This condition will beindicated by a shutting off of the crystal pilot lamp from time to time, and by thefact that the thermometer will reach a fairly steady reading of about 55 0 in type1 or about 65 0 in types 2 & 3.

. However, if the crystal pilot light stays on continuously, and if the ther-mometer goes up beyond 60 degrees in type 1 or 70 degrees in types 2 & 3, themercury column in the thermostat switch or the temperature indicating thertno­meter has probably been separated in shipment. Turn the instrument off immedi­ately and proceed as follows.

CAUTION: The contact thermometer is connected to the 115 volt AC linein most units; the instrument MUST BE UNPLUGGED before doing any work.

Step 1: Remove the instrument from its cabinet and inspect the tempera­ture indidating 'thermometer0 This is easily done and faults are usually evident.If mercury separating or air bubbles are present, remove this thermometer andeither replace it or treat as outlined in step 5. If it appears satisfactory, pro­ceed to step 2.

(Over)

I 1 , . ~'

I J ,J'

HEW LET T - P A ~ K A: R D COM PAN Y < 275 ~age Mill Road Palo Alto, California ., \

Page 2 of 3

Step 2: Remove the mercury switch contact thermometer as indicatedbelow:

Type 1: In this type the contact thermometer is mounted in the side of theoven casting, and is removed by gently pulling it out. It is not necessary to re­move the oven. Proceed to step 3.

Type 2: Unplug and reml ve th crystal oven unit. Remove the screwsholding the temperature indicah.. g thermometer bracket and pull the bracket andthermometer carefully fronl the oven. Renlove the mercury switch bracket andthree screws on the outside bottom of the oven casting and 0:1e screw on the topend of the unit. Remove cover and lift unit out ol casting. Then remove the mer­cury switch from its recess in the inner casting. Proceed to step 3,

Type 3: Unplug and remove the crystal oven unit. Renlove the guardaround the contact thermometer and unscrew the two terminals where the con­tact thermonleter is connected. Gently pull it from its recess in the oven unit.Proceed to step 3.

Step 3: All types. Inspect the mercury switch for mercury colunln sepa­ration and any minute air bubbles in mercury bulb. If either separation or airbubbles are present, proceed to step four. If neither is present and the troublehas been definitely traced to the contact thernlonleter, it is probable that theswitch contact is open and the contact thermonleter must be replaced. In thiscase proceed to step 6.

Step 4: Renlove the contact thernlometer from the instrument.

Type 1: The two leads are wired to the deck outside the oven. They areeasily unsoldered for removal of the contact thermonleter.

Type 2: The two leads are soldered inside pins 2 and 5 of the plug in thebottom of the casting. Heat the outside of these pins to remove the wires. Thecontact thernlometer has already been removed in step 2.

Step 5: If either air bubbles or separation are present, place the mercuryswitch bulb in ice water until mercury occupies only the bulb cOnlpartment. Tiplightly to renlove any bubbles or globules left in colunln. The temperature indi­cating thermometer may be treated in this same manner.

Place the bulb in a vessel of water and heat until mercury completelyfills column and a small portion of the enlargement at top of colunln. Then re­move the mercury switch and watch mercury descend to rOOnl tenlperature. Ifthere is no separation or bubbles present, the nlercury switch may now be putback in service. It may be necessary to repeat the above procedure more thanonce to unite all the .mercury and remove all bubbles.

CAUTION: Immerge only bulb portion of nlercury switch. If mercuryswitch leads get wet or any moisture collects beneath the elastic insula­tor covering the contact rings, remove the plastic insulator and dry tube,insulator, and leads thoroughly before placing back in service. Other­wise leakage between leads may cause heater relay to renlain open.

M-4

•,

Page 3 of 3

Step 6: The mercury switch should be tested with an ohmmeter beforereplacing in the oven. Heat the mercury bulb. The ohmmeter should show anopen circuit and then a short circuit as the column expands to reach both inter­nal contacts. These are directly beneath the rings on the glass tube. Failure todo so indicates a defective switch whIch must be replaced. Proceed to step 7.

Step 7: Reassemble the entire oven unit.

CAUTION: In many units the contacts of the thermometer are connectedto the A. C. power line. They MUST BE insulated from thecasting by plastic sleeving or electrical tape.

Type 1: Insert the mercury switch as far as possible into the casting.

Type 2: When replacing the mercury column switch do not seat it anydeeper than necessary; otherwise the temperature indicating thermometer willnot seat to the necessary depth.

Type 3: Insert the mercury column switch as far as possible into theoven unit.

Step 8: Replace the oven unit in the instrument. Turn the instrument onand keep a check on the temperature indicating thermometer to be sure that itand the mercury column switch are now operating properly.

70KY071 M-4

LISTPACKING

DATE 3-10-5~

CUSTOMER'S ORDER NO.

HEWLETT.PACKARD COMPANY

L.t".,,,ye7.",um'i4,.1··.1.9.iffU'U<y395 PAGE MILL ROAD PALOALTO,CALlF.

'I.~~~~~~~~~~~~ ~~-~~~-~-~~~~~~~~

EC-32177-4 REPRESENTATIVE JDR

IGOVERNMENT 0NON·GOVERNMENTXX

,.

SOLD TO

General Electric Co.CommeDcial EquipmentC&GED, Electronics Park, Bldg. 7Syracuse, New York

SHIP TO

Station W S L IStandard Life B~ Co.Jackson, Mississippi

SHIP

VIA MARK

TERMS

INVOICE TO

SHIPPING DATE

WAYBILL No. TAXABLE 0 NON-TAXABLE 0

QUANTITY APPROX. QUANTITY BALANCEO.:scRlnIOH I UN.T"~ICI.0"0.".0 SHIPPING DATE .HI....EO DUE

1 -~ ,:"hp- Instruction Manual for 335E N/CSerial No. 15

WE APPRECIATE YOUR ORDER. THE ABOVE IS A COpy GIVENI I TO OUR SHIPPING DEPARTMENT. PLEASE NOTIFY US

OUR 73509 PROMPTLY IF THERE IS ANY OMISSION OR ERROR.ORDER HEWLETT-PACKARD COMPANY

THIS ORDER IS ACCEPTED SUBJECT TO THE CONDITIONS ON THE REVERSE SIDE. OUR RESPONSIBILITY CEASES WHEN GOODS ARE D£LIVER&DTO THE TRANSPORTATION CO. ALL CLAIMS FOR LOSS OR DAMAGE IN TRANSIT MUST BE MADE AGAINST THE CARRIER.

ALL PRICES ARE F. O. B. PALO ALTO UNLESS OTHERWISE SPECIFIED