2-80
ELECTRICAL TROUBLESHOOTING GUIDE
1. SYSTEM POWER SUPPLY ON SMPS BOARD
No 6 VA.
No 3.8 VA.
Power Line of MAIN PCB is short.
Power Line of MAIN PCB is short.
Is F901 normal?
Is F901 normal?
Is TH901 normal?
Is TH901 normal?
Is BD901 normal?
Is BD901 normal?
Is the VCC (11 V ~ 25 V) supplied to IC902 pin5?
Is the VCC (11 V ~ 25 V) supplied to IC902 pin5?
Replace F901. (same fuse)
Replace F901. (same fuse)
Replace TH901.
Replace TH901.
Replace BD901.
Replace BD901.
Is D918 normal?
Is D952 normal?
Check or replace D918.
Check or replace D952.
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES