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5. Power Board
No power
Check to CN902 Pin4,5 =12V and Pin6,7 = 5 V
OK
Check Interface board
Check AC line volt 120V or 220V
Change F901, Check BD901, L901, IC901
Check the voltage of C905(+)
Check bridge retified circuit
Check start voltage for the Pin8 of IC901
Chan
e IC901
OK
Check the auxiliary voltage is smaller than 20V
OK
NG
No power
NG
NG
OK
Check T901,D906, D905, Q902,ZD902,ZD922,IC904,IC903
Check IC901
NG
OK
NG
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