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SERVICE MANUAL 3Y11 CHASSIS
ENGINEER BY: CHECKED BY: PPROVED BY: _______________
Design and specifications are subject to change without prior notice. ( ONLY REFERRENCE)
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:
l A C 9 0 V - 2 6 0 V 5 0 / 6 0 H z
l 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 )
l VOLTAGE SYNTHESISED TUNING SYSTEM
l 100/256 PROG RAM S MEM ORY (OPTION)
l BLUE BACK FUNCTION
l 120 MINUTES SLEEP TIMER
l FULL AUTO PROGRAM
l TIME ON
l CLOCK ; CHILD LOCK
l 2 AV INPUT
l GAME (OPTION)
l 8 PAGES TELETEXT (OPTION)
l BLACK LEVEL STRETCH
l PROGRAM VIEW FUNCTION
l 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 ¡ å 7 0 W £ ¨ M A X . £ ©
2 1 ¡ å 9 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
Chassis Block Diagram
-4-
IC Block Diagram
-5-
IC 201 (IIC BUS SINGLE CHIP VIF,SIF,VIDEO CHROMA) LA76810A/HA
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
2S
1D
3
Comp2
IC202<SECAM> La7642
D613<PHOTO TRANSISTOR> TLP621
IC Block Diagram
-8-
1
INPUT
2
OUTPUT SERIES PASSELEMENT
SOAPROTECTION
REFERENCE VOLTAGE
ERRORAMPLIFIER
THERRMALPROTECTION
STARTING CIRCUIT
CURRENTGENERATOR
REFERENCE VOLTAGE
3GND
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 405TO AUDIO IN
CN 406TO IN VIDEO
CN 401£¯402TO SPEAKER
CN 302CN 301TO CN301B
-10-
CN 001TO CONTROL
CN 301BFROM CN 301 CN 602
TO DEGAUSSCN 201BFROM CN 201SCREEN
FOCUS
CN 601AC IN
CN
20
1
FRO
M C
N 2
01
B