File name Ch. 3P31.pdfSC
Number : 0009E
SERVICE MANUAL PAL/SECAM/NTSC
C21-RF80S/SN/SNT Destination Code O81 O51 751 19* 201 433 98* 121
3P31
Chassis
CAUTION:
Before servicing this chassis, it is important that the service technician read the " Important Safety Note" in this Service Manual.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
COLOUR TELEVISION
OCT 2003 Digital Media System Group, Hitachi Asia Ltd.
TECHNICAL SPECIFICATION
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TECHNICAL SPECIFICATION
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CHASSIS BLOCK DIAGRAM
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E
IC BLOCK DIAGRAM
IC 121 (Universal HI-FI Audio Processor) TDA9859
IC 161 (BTL Audio Amplifier) TDA8944J
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IC BLOCK DIAGRAM
IC 401 (Vertical Deflection Booster) STV9302A
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IC BLOCK DIAGRAM
IC 501(Video Output Amplifier) TDA6107Q
7
IC 601 (Power Switch) KA5Q0765RTH
-8-
IC BLOCK DIAGRAM
IC 602 (Photo Transistor ) TLP621 TLP621
1 2 1:ANODE 2:CATHODE 3:EMITTER 4:COLLECTOR
4 3
IC 653 & IC 181& IC 652 (Regulators) L7800 Series
REFERENCE VOLTAGE
INPUT 1
SERIES PASS ELEMENT
OUTPUT 2
CURRENT GENERATOR
SOA PROTECTION
STARTING CIRCUIT
REFERENCE VOLTAGE
ERROR AMPLIFIER
THERRMAL PROTECTION
GND 3
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IC BLOCK DIAGRAM
IC 701 ( TV Signal Processor-Teletext ) TDA93XXPS/N2/5I
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IC BLOCK DIAGRAM
IC 861 ( Digital TV Sound Demodulator/Decoder) TDA9874AH
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TRANSISTOR MARK
PNP
PNP
NPN
NPN
NPN
PNP
B42 1
NPN
C18 15
C2230
C24 82
C27 03
A10 13
E C
INPUT GND
A96 6
B PNP
A1015
E C
B
E C
B
E C
B
E C
B
E C
B
E C
B
PNP
B77 4
E C B
NPN
B42 0
PNP
C21 20
NPN
C22 16
B E C
NPN
C27 17
E C
B
E C
B
E C B
B E C
L7808
C1651C
L7812
L7805
OUTPUT
INPUT GND
OUTPUT
INPUT GND
OUTPUT
B
C
E
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MAIN PCB TOP LAYER
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MAIN PCB BOTTOM LAYER
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AV TERMINALS PCB LAYOUT
Side AV Terminals PCB Layout
Control Panel PCB Layout
Remote Control Unit PCB Layout
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SERVICE ADJUSTMENTS
ALIGNMENT INSTRUCTION (3P31) Before Servicing The TV Set
The main power is 100~240V 50/60HZ . Please be careful when you are servicing. Don t short any two soldering points, which should not be shorted and don t touch any components, which should not be touched. Please disconnect the power plug form the wall outlet before servicing. For safety reasons, all components replaced should be identical with BOM. Before alignment, ensure the TV set has heat run for at least 30 minutes and degauss the CRT thoroughly with demagnetizer. The data of EEPROM must be stored before the adjustment for main chassis.
Tools And Equipment For Adjustment
Small - Screwdriver Without Inductance Pattern Generator DC Regulated power supply Digital Voltmeter Sweep Signal Generator 20MHz 2-channel Oscilloscope
Power Adjustment
Connect a 100W bulb across C616 and AC 200V power to CN601. If the bulb lights up,the voltage is normal and power is ok, else please proceed servicing.
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SERVICE ADJUSTMENTS
General Adjustment Enter factory mode
Press SOUND MODE , RECALL , CH I/II keys on remote control unit to enter factory mode. Press 0-9 numeric keys to enter |