Download ctv-55v10, 55s10, 55x10, 55z10 service manual

SERVICE MANUAL
Colour Television PAL/SECAM/BG
Models
14” CTV-37V10, 37V20, 37X10
(chasis 3011)
21” CTV-55V10, 55S10, 55X10, 55Z10
TI O
C UT
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 ! .
-2-
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¡ ¢R E C E I V E S Y S T E M£ º
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¡ ¢AV 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
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
-4-
IC Block Diagram
IC 201 (IIC BUS SINGLE CHIP VIF,SIF,VIDEO CHROMA) LA76810A/HA
-5-
IC Block Diagram
IC 402&IC 403 (3W AUDIO OUTPUT)LA 4285
+
-
EVR
1
2
3
4
5
6
7
8
10
VCC
+
5V
INT
9
PRE
+
+
+
PWR
GND
GND
EXT
RL 8
INT/EXT EVR
SM
CONT
D.C.
PWR
NF
IC701 <TELETEXT> STV-5348
CBLK 28
2
4
L23
V DDD
V DDA
18
22
3
Data
CLAMPING
SYNCHRONIZING
DATA EXTRACTION
DATA DECODING
DATA
PROCESSING
Clock
Data
1
MA/SL POL
VCR/TV 21
24
XTO 23
SCL 16
SDA 17
20 TEST
12 BLAN
13 COR
DISPLAY
INTERFACE
2
I C BUS
INTERFACE
STV5348
19 DV
8 PAGES
MEMORY
Data
V SSO 25
OSCILLATOR
FREQUENCY
SYNTHETIZER
TIME BASE
Address
XTI
CTRL
6
Address
FFB
5
CTRL
CVBS
STTV/LFB
8 RED
9 GREEN
10 BLUE
15 Y
7
26
27
11
14
V SSD
V SSA
TEST
RGB REF
ODD/EVEN
-6-
IC Block Diagram
IC301 <Vertical Output> LA7840
PUMP
UP
THERMAL
PROTECTION
-
AMP
+
6
7
PUMP UP OUT
5
Vcc
4
INVERTINO INPUT
3
NON INV.INPUT
Ver.OUTPUT
GND
2
OUTPUT STAGE Vcc
1
IC602 <POWER > STR-G6653
4
VIN
1
D
START
O.V.P
LATCH
DRIVE
2
REG.
T.S.D
+ Vth(1)
O.S.C
Comp1
+
S
5
O.C.P/F.B
Vth(2)
Comp2
3
GND
-7-
IC Block Diagram
IC202 <SECAM> La7642
IC203,Q609,IC601&IC302<REGULATORS> L7800 SERIES
INPUT
REFERENCE
VOLTAGE
SERIES
PASS
ELEMENT
1
CURRENT
GENERATOR
SOA
PROTECTION
ERROR
AMPLIFIER
REFERENCE
VOLTAGE
STARTING
CIRCUIT
OUTPUT
2
THERRMAL
PROTECTION
GND
3
D613<PHOTO TRANSISTOR> TLP621
TLP621
1
4
2
3
1:ANODE
2:CATHODE
3:EMITTER
4:COLLECTOT
-8-
Transistor Mark
NPN
PNP
PNP
D2499
L780 9
INPUT
C
E C B
E C B
B E C
L781 2
OUTPUT
GND
B
C2717
B
INPUT
OUTPUT
GND
E
-9-
NPN
C1815
E C
B
A1015
C2120
C2482
A966
E C B
E C
NPN
PNP
L780 5
INPUT
OUTPUT
GND
Chassis wiring diagram
CN 401£¯402
TO SPEAKER
CN 406
CN 405
TO VIDEO IN
TO AUDIO IN
CN 302
CN 301
TO CN301B
FOCUS
1B
201 N 20
CN M C
FRO
CN 301B
FROM CN 301
SCREEN
CN 001
TO CONTROL
CN 201B
FROM CN 201
-10-
CN 602
TO DEGAUSS
CN 601
AC IN