Colour Television PAL/SECAM/BG

Models

14” CTV-37V10, 37V20, 37X10(chasis 3011)

21” CTV-55V10, 55S10, 55X10, 55Z10

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SERVICE MANUAL

Contents

Safety NoticeTechnical specification--------------------------------------------

Operation Instructions

--------------------------------------------------------23

Chassis Block Diagram--------------------------------------------4IC Block Diagram -------------------------------------------------5-8Transistor mark ----------------------------------------------------9Chassis wiring diagram --------------------------------------------10PCB Top/Bottom layer -------------------------------------------11-13Service Adjustments ------------------------------------------- 14-16Purity and Convergence Adjustment ----------------------------17Control Location ---------------------------------------------------18Input and Output Terminals----------------------------------------19

------------------------------------------20-21Mechanical Disassemblies----------------------------------------22Cabinet parts List ---------------------------------------------------23 Circuit Diagram-----------------------------------------------------24

Safety Notice

-2-

SAFETY PRECAUTIONS

1:An isolation transformer should be connected in the power line between the receiver and the AC line when a service is performed on the primary of the converter transformer of the set.2:Comply with all caution and safety-related notes provided on the cabinet back, inside the cabinet, on the chassis or the picture tube.3:When replacing a chassis in the cabinet, always be certain that all the protective devices are installed properly,such as,control knobs, adjustment covers or shields, barriers,isola- tion resistor-capacitor networks etc.. Before returning any television to the customer,the service technician must be sure that it is completely safe to operate without danger of electrical shock.

X-RADIATION PRECAUTION

The primary source of X-RADIATION in television receiver is the picture tube. The picture tube is specially constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exce-eds specfied limits, take necessary corrective action. Carefully follow the instructions for+B1 volt power supply adjustment, and high voltage check to maintain the high voltage within the specified limits.

PRODUCT SAFETY NOTICE

Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by mark in the parts list and the schematic diagram designate components in which safety can be of special significance. It is particularly recommended that only parts designated on the parts list in this manual be used for com-ponent replacement designated by mark . No deviations fromresistance wattage or vol-tage ratings may be made for replacement items designated by mark .!

!

!

FEATURES:

A C 9 0 V - 2 6 0 V 5 0 / 6 0 H z

M U L T I S Y S T E M : P A L B G /D K / I , S E C A M B G / D K ( O P T IO N ) , N T S C M ( O P T I O N )

VOLTAGE SYNTHESISED TUNING SYSTEM

100/256 PROG RAM S MEM ORY (OPTION)

BLUE BACK FUNCTION

120 MINUTES SLEEP TIMER

FULL AUTO PROGRAM

TIME ON

CLOCK ; CHILD LOCK

2 AV INPUT

GAME (OPTION)

8 PAGES TELETEXT (OPTION)

BLACK LEVEL STRETCH

PROGRAM VIEW FUNCTION

FOUR PICTURE MODE£ºMILD;COLORTUL; STANDARD ;CUSTOM;DYNAMIC

GENERAL SPECIFICATION:

1¡¢P O W E R C O N S U M P T I O N £ º 1 4 ¡ å7 0 W £ ¨M A X . £ ©

2 1 ¡ å9 0 W £ ¨M A X . £ ©

2¡ ¢RECEIVE SYSTEM£º D/K ; I ; B/G ; M

3¡¢COLOUR SYSTEM : PAL/ SECAM / NTSC

4¡¢VISION INTERMEDIATE FREQUENCY £º 38.9MHz

5 ¡¢ I N T E R - C A R R I E R F R E Q U E N C Y : 4 . 5 M H z ( M )

5 . 5 M H z ( B / G )

6 . 0 M H z ( I )

6 . 5 M H z ( D / K )

6. CHROMA IF FREQUENCY PAL/NTSC: 34.47/35.32 MHz

7¡¢ANTENNA TYPE: DIN TYPE 75 OHM

8¡¢C H A N N E L S R E C E I V I N G : V H F - 1 A 0 ; E 2 - E 4 ; S 1 - S 9 CH 46.25-161.25MHz

V H F - 3 S 1 0 - S 4 1 ; E 5 - E 1 2 CH 168.25-463.25MHz

U H F E 2 1 - E 6 9 CH 471.25-855.25MHz

9¡¢ TUNING SYST EM£º VS TUNING

10¡¢ AV IN/OUT£º 2 A V I N + 1 A V STEREO O U T

11¡ ¢AV IN/OUT SPECIFICATION£º VIDEO IN----1.0 ¡À0.2V P-P 75 O H M

AUDIO IN----0-2V (r.m.s )

VIDEO OUT----1.0¡À0.2 V P-P 75 O H M

AUDIO OUT----0-2V (r.m.s)

12¡¢OSD LANGUAGE£º ENGLISH

13¡¢AUDIO OUTPUT POWER: > 3W (1KHz, 0.5V INPUT , 10%TH D)

14¡¢SAFETY AUTHENTICATION STANDARD£º CB

15¡¢LED INDICATORS£º POWER ON

16¡¢HAND SET TYPE £º HS08

17¡¢HAND SET POWER SUPLY £º BATTERY 3V £ UM -3/R6/AA£©x2

18¡¢COLOUR PICTURE TUBE£º 14"£-21" 90 DEGR EE TUBE

19¡¢REMOTE CONTROL DISTANCE: ¡Ý5 m

Ch

assis B

lock

Dia

gra

m

-4-

IC B

lock

Dia

gra

m

-5-

IC 2

01

(IIC B

US S

ING

LE C

HIP V

IF,SIF,V

IDEO

CH

RO

MA

) LA7

68

10

A/H

A

IC701<TELETEXT> STV-5348

IC Block Diagram

-6-

IC 402&IC 403(3W AUDIO OUTPUT)LA 4285

+

1 2 6543 1097 8VCCINT

+

EXT

PREGND

INT/EXT SM

EVRCONT

++

6

++

D.C.

++++

PWR NF

PWRGND

++

RL 8

+ -

EVR

5V

STV5348

CLAMPINGSYNCHRONIZINGDATA EXTRACTION

STTV/LFB FFB MA/SL VDDDL23POL VDDA

OSCILLATORFREQUENCYSYNTHETIZERTIME BASE

I C BUS INTERFACE

DISPLAYINTERFACE

8 PAGES MEMORY

DATA DECODING DATA PROCESSING

555

1

46 2 444

28

18

19

322

13

12

20

8

15

10

9

21

24

28

23

25

16

17

27267 1411

DV

TEST

BLAN

COR

RED

GREEN

BLUE

Y

ODD/EVENRGB REFTESTVSSAVSSD

CVBS

CBLK

VCR/TV

XTO

XTI

VSSO

SCL

SDA

Data

Clock

Da

ta

Ad

dre

ss

CTR

L

Da

ta

Ad

dre

ss

CTR

L

2

IC301<Vertical Output> LA7840

IC602<POWER > STR-G6653

IC Block Diagram

-7-

7654321

GN

D

Ve

r.O

UTP

UT

OU

TPU

T STA

GE V

cc

NO

N IN

V.I

NPU

T

INV

ER

TIN

O IN

PU

T

Vc

c

PU

MP U

P O

UT

PUMP UP

AMP

THERMALPROTECTION

-+

Comp2

Vth(2)

Vth(1)

Comp1

GND

O.C.P/F.B

DRIVELATCHO.V.P

REG.

T.S.D

VIN4

START

O.S.C

-+

-+

5

2

S

1

D

3

Comp2

IC202<SECAM> La7642

D613<PHOTO TRANSISTOR> TLP621

IC Block Diagram

-8-

1

INPUT

2

OUTPUT SERIES

PASS

ELEMENT

SOA

PROTECTION

REFERENCE VOLTAGE

ERRORAMPLIFIER

THERRMAL

PROTECTION

STARTING CIRCUIT

CURRENT

GENERATOR

REFERENCE

VOLTAGE

3

GND

IC203,Q609,IC601&IC302<REGULATORS> L7800 SERIES

TLP621

1

2 3

4

1:ANODE2:CATHODE3:EMITTER4:COLLECTOT

Transistor Mark

-9-

B C E

C BE

C2482

C BE

C1815

C BEC BE

A1015

PNP NPN

C2120

C BE

PNP

C2717

CB E

NPN

L7805

INPUT

GND

OUTPUT

L7812

INPUT

GND

OUTPUT

L7809

INPUT

GND

OUTPUT

NPNPNP

A9

66

D2499

Chassis wiring diagram

CN 405

TO AUDIO IN

CN 406

TO IN VIDEO

CN 401£ 402

TO SPEAKER

CN 302

CN 301

TO CN301B

-10-

CN 001

TO CONTROLCN 301B

FROM CN 301 CN 602

TO DEGAUSSCN 201B

FROM CN 201SCREEN

FOCUS

CN 601

AC IN

CN

20

1

FRO

M C

N 2

01

B