Power/Inverter Board - Fujitsu FSC B17-1 Service Manual

8.2.2 Power/Inverter Board

1.) No power
Check to CN102 Pin1 and
pin2 = 5V
Check AC line volt 120V or
220V
Check the voltage of C905(+)
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is smaller than 20V
Check R919, D910,D911,D912,D913, ZD904
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OK
NG
NG
Change F901 , check BD901,Q903,IC901
OK
NG
Check bridge rectified circuit
OK
NG
Change IC901
Repeating the start voltage
NG
1) Check IC902, IC903
2) Check Q901,Q902...OVP circuit
OK
Check Interface board
37
FSC B17-1 Service Manual