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ELECTRICAL TROUBLESHOOTING GUIDE
5 V abnormal
YES
F901 nomal?
YES
BD901 nomal?
YES
TH901 nomal?
YES
Is VCC (9V-25V)
supplied to IC902 Pin5?
YES
ZD902 nomal?
NO
D959 nomal?
YES
IC957 nomal?
YES
Power line of main PCB is short.
NO
Replace F901 (Use same type fuse).
NO
NO
NO
NO
NO
NO
3-3
Replace BD901.
Replace TH901.
D907 nomal?
NO
Check or replace D907.
Replace ZD902.
Replace D959.
Replace IC957.
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