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£ ºM 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 ¡ å7 0 W £ ¨M A X . £ © 2 1 ¡ å9 0 W £ ¨M A X . £ © 2¡ ¢ E C E I V E S Y S T E M£ º R D/K ; I ; B/G ; M 3¡¢C 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 £ 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 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 7¡¢A N T E N N A T Y P E : D I N TY P E 75 OHM 8¡¢C 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 £ º V S T U N IN G 10¡¢ AV I N /O U T £ º 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£ º V I D E O IN ----1.0 ¡À0.2V 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----1.0¡À0.2 V P-P A U D I O O U T----0-2V (r.m.s) 12¡¢O S D L A N G U A G E£ º E N G L IS H 13¡¢A U D I O O U T P U T P O W E R : > 3W (1KHz, 0.5V INPUT , 10%TH D) 14¡¢S 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 £ º C B 15¡ ¢L E D I N D IC A TO R S£ º POWER ON 16¡¢H A N D S E T T Y P E £ º HS08 17¡¢H A N D S E T P O W E R SU P LY £ º BATTERY 3V £¨U M -3/R6/AA £©x2 18¡¢C O L O U R P I C TU R E T U B E£ º 14"£-21" 90 DEGR EE TUBE 19¡¢R E M O T E C O N T R O L D IS TA N C E : ¡ Ý5 m 1¡ ¢P O W E R C O N S U M P T I O N £ º
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