Section 3 Electrical - Zenith XBV243 Service Manual

SECTION 3 Electrical

TROUBLESHOOTING
1. Power(SMPS) CIRCUIT
(1) No 5.3VA (SYS/Hi-Fi/TUNER)
NO 5.3VA.
YES
NO
Is F101 normal?
YES
NO
Is R101
normal?
YES
NO
Is Bd101
normal?
YES
NO
Is Vcc (8.5~21V)
supplied to IC101 Pin7?
YES
N O
Is the D112 normal?
YES
N O
Is there about 2.5V
at the IC102 Vref?
YES
N O
Is D110 normal?
YES
Check the Main PCB
5.3VA/5.0V Line short?
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ELECTRICAL
Replace F101.
Replace
BD101.
Replace R101.
Is D102
normal?
N O
Check or Replace
D102.
Replace D112.
Replace IC102.
Replace the D110.
3-1
(2) No 12VA (TO CAP, DRUM MOTOR)
NO 12VA.
YES
Is the Vcc (13V) supplied to (+)
terminal in D115 and D117?
YES
Is the Vcc (12V) supplied to (-)
terminal in D115 and D117?
YES
Check or Replace
the Motor Vcc.
(3) No 5.2V (SYS/Hi-Fi/TUNER)
NO 5.2VA.
YES
NO
Is 5.3VA put into
Q116 Emitter?
YES
NO
Is Q115 Base
"H"?
YES
NO
Is about 5V put into
Q116 Base?
YES
Check or Replace
Q115/Q116
NO
Check or Replace
D110.
NO
Replace D115,
5.3VA Line Check.
Check the Power
Control.
Check or Replace Q115,
R160, R161, R162, D122.
D35E COMBO - ELECTRICAL