Service manual

3-4
VCR ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
NO 5.3VA.
Replace F101.
(Use the same type)
Is F101 normal?
Is R101 normal?
Is BD101 normal?
NO
NO
NO
NO
NO
NO
Replace BD101.
Replace R101.
Is D102 normal?
Check or Replace
D102.
Replace D112.
Replace IC103.
YES
YES
YES
YES
YES
YES
Is Vcc(8.5~21V) sup-
plied to IC101 Pin7?
NO
Is D112 normal?
Is there about 2.5V
at IC103 Vref?
Check the Main PCB
5.3VA/5.0V Line short?
(1) No 5.3VA (SYS/Hi-Fi/TUNER)
NO 12VA.
Check or Replace
D110.
Is the Vcc(13V) supplied
to (+) terminal in D115?
Check or Replace
the Motor Vcc.
Is the Vcc(12V) supplied
to (-) terminal in D115?
NO
NO
Replace D115.
YES
YES
(2) No 12VA (TO CAP, DRUM MOTOR)
NO 5.2VA.
5.3VA Line Check.
Is 5.3VA put into
Q160 Emitter?
Is about 5V put into
Q160 Base?
Is the Q162 Base
“H”?
NO
NO
Check the Power
Control.
NO
Check or Replace Q162,
R157, R158, R159, D121.
YES
Check or Replace
Q162/Q160.
YES
(3) No 5.2V (SYS/Hi-Fi/TUNER)