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ELECTRICAL TROUBLESHOOTING GUIDE
POWER SUPPLY ON SMPS BOARD
No 12 VA (Primary side)
Is the F102 normal?
Is TH101 normal?
Is D101 normal?
Is Q101 normal?
Is the VCC
(16 V ~ 27 V) supplied to IC101
pin7 ?
Power line of Main PCB is short.
YES
YES
YES
YES
YES
YES
NO
Replace F102 (same fuse).
NO
NO
NO
NO
Check or replace D104.
Is R121, R123 normal?
Check or replace R121, R123.
3-43
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Replace TH101.
Replace D101.
Replace Q101.
Is D104 normal?
Only for training and service purposes.
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