Text preview for : QUADRO-3Y11CHASSIS.PDF part of QUADRO CTV-37V10 CTV-37V20 , 37x10 CTV-55V10 , 55S10 , 55X10 , 55Z10 (chassis 3011) LA76810 , LA7642 , LA8633xx , STV5348 , STR-G6653 P/Nr 0502-A3Y111-01



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SERVICE MANUAL

Colour Television PAL/SECAM/BG Models

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

21" CTV-55V10, 55S10, 55X10, 55Z10

TO C UTI ON Bef\be se\fing the ch4\p13sis, ead the "X-Ray Radiati\bn Pecauti "Safety Pecauti\bn" and "P\bduct Safety | N\btice" \bn 2 \bf this manual

Contents
Safety Notice--------------------------------------------------------2 Technical specification--------------------------------------------3 Chassis Block Diagram--------------------------------------------4 IC Block Diagram -------------------------------------------------5-8 Transistor mark ----------------------------------------------------9 Chassis wiring diagram --------------------------------------------10 PCB Top/Bottom layer -------------------------------------------11-13 Service Adjustments ------------------------------------------- 14-16 Purity and Convergence Adjustment ----------------------------17 Control Location ---------------------------------------------------18 Input and Output Terminals----------------------------------------19 Operation Instructions------------------------------------------20-21 Mechanical Disassemblies----------------------------------------22 Cabinet parts List ---------------------------------------------------23 Circuit Diagram-----------------------------------------------------24

Safety Notice
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,isolation 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 exceeds 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 component replacement designated by mark ! . No deviations fromresistance wattage or voltage ratings may be made for replacement items designated by mark ! .
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FEATURES:
AC 90V - 260V 50/60Hz 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 ) V O LTA G E S Y N T H E SI SE D T U N IN G S Y S T E M 100/256 PROG RAM S MEM ORY (OPTION) B L U E B A C K F U N CT I O N 120 MINUTES SLEEP TIMER FULL AUTO PROGRAM TIME ON C L O C K ; C H I LD L O C K 2 AV I N P U T G A M E ( O P TI O N ) 8 PAGES TELETEXT (OPTION) BLACK LEVEL STRETCH P R O G R A M V I EW F U N C T IO N F O U R P IC T U R E M O D E M I LD ; C O LO R T U L; STA N D A R D ; C U ST O M ;D Y N A M I C

G E N E R A L S PE C I F IC AT I O N :
1 4 7 0 W M A X . 2 1 9 0 W M A X . 2 E C E I V E S Y S T E M R D/K ; I ; B/G ; M 3C O L O U R SYSTEM : PA L/ SECAM / N T S C 4 V I S IO N I N T E R M E D IA T E F R E Q U E N C Y 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 MHz (M) 5.5 MHz (B/G) 6.0 MHz (I) 6.5 MHz (D/K) 6. C H R O M A IF F R E Q U E N C Y PA L / N T SC : 34.47/35.32 MHz 7A N T E N N A T Y P E : D I N TY P E 75 OHM 8C H A N N E L S R E C E IV 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 UHF E 2 1-E69 CH 471.25-855.25MHz 9 T U N I N G SYST E M V S T U N IN G 10 AV I N /O U T 2 A V I N + 1 A V STEREO O U T 11 I N /O U T S P E C IF I C AT I O N V I D E O IN ----1.0 0.2V P-P AV 75 O H M A U D I O IN ----0-2V (r.m.s ) 75 O H M V I D E O O U T----1.00.2 V P-P A U D I O O U T----0-2V (r.m.s) 12O S D L A N G U A G E E N G L IS H 13A U D I O O U T P U T P O W E R : > 3W (1KHz, 0.5V INPUT , 10%TH D) 14S A F E T Y A U T H E N T I C AT I O N S TA N D A R D C B 15 L E D I N D IC A TO R S POWER ON 16H A N D S E T T Y P E HS08 17H A N D S E T P O W E R SU P LY BATTERY 3V U M -3/R6/AA x2 18C O L O U R P I C TU R E T U B E 14"-21" 90 DEGR EE TUBE 19R E M O T E C O N T R O L D IS TA N C E : 5 m 1 P O W E R C O N S U M P T I O N

Chassis Block Diagram

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IC Block Diagram
IC 201 (IIC BUS SINGLE CHIP VIF,SIF,VIDEO CHROMA) LA76810A/HA

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

EVR

+ -

1 INT

2

3

4 5V

5

6
+

7
+

8

9
+

10
+

VCC

PRE
GND

EXT
INT/EXT EVR SM CONT D.C. PWR NF

PWR GND

RL 8

IC701 STV-5348
STTV/LFB FFB MA/SL POL L23 V DDD V DDA

5
CVBS

6

2

4

18
Data Clock

22

3

1

CBLK 28 VCR/TV 21 XTI

CLAMPING SYNCHRONIZING DATA EXTRACTION

DATA DECODING DATA PROCESSING Address Data CTRL

19 DV

20 TEST

24

XTO 23 V SSO 25

Address

OSCILLATOR FREQUENCY SYNTHETIZER TIME BASE Data

8 PAGES MEMORY CTRL

12 BLAN 13 COR 8 RED 9 GREEN 10 BLUE 15 Y

SCL 16 SDA 17

I C BUS INTERFACE

2

DISPLAY INTERFACE

STV5348

7
V SSD

26
V SSA

27
TEST

11
RGB REF

14
ODD/EVEN

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IC Block Diagram
IC301 LA7840

PUMP UP THERMAL PROTECTION

AMP

-

+

GND

NON INV.INPUT

OUTPUT STAGE Vcc

INVERTINO INPUT

IC602 STR-G6653
4 VIN

PUMP UP OUT

1

2
Ver.OUTPUT

3

4

5

6
Vcc

7

1 D
START O.V.P LATCH DRIVE

REG. O.S.C

2

+ Vth(1)
Comp1

S 5 O.C.P/F.B

T.S.D

+
Comp2

Vth(2)

3 GND

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IC Block Diagram
IC202 La7642

IC203,Q609,IC601&IC302 L7800 SERIES
INPUT 1 REFERENCE VOLTAGE SERIES PASS ELEMENT OUTPUT 2

CURRENT GENERATOR

SOA PROTECTION

STARTING CIRCUIT

REFERENCE VOLTAGE

ERROR AMPLIFIER

THERRMAL PROTECTION

GND 3

D613 TLP621
TLP621 1 2 1:ANODE 2:CATHODE 3:EMITTER 4:COLLECTOT 4 3

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Transistor Mark

PNP

NPN PNP PNP
A1015

NPN
C1815

NPN
C2717

C2482

E C

D2499

A966
B

E C B

C2120

E C

B

E C B

E C B

B E C

L780 9

L781 2

L780 5

INPUT GND

OUTPUT

INPUT GND

OUTPUT

INPUT GND

OUTPUT

B

C

E

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Chassis wiring diagram

CN 406 CN 405 TO VIDEO IN TO AUDIO IN

CN 401 402 TO SPEAKER CN 302

CN 301 TO CN301B

FOCUS

1B 201 N 20 CN M C FRO

CN 301B FROM CN 301 SCREEN

CN 201B FROM CN 201
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CN 001 TO CONTROL

CN 602 TO DEGAUSS

CN 601 AC IN