Fujitsu FSC B17-1 Service Manual page 38

2.) W / LED , No Backlight
Check C201(+) =12V
Check ON/OFF signal
Check U201 pin9=12V
Check the pin1 of U201 have sawtooth wave
Check D201(-),D202(-) have the output of square wave at short time.
Check the resonant wave of pin2 & pin5 for PT201/PT202
Check the output of PT201/PT202
Check connecter & lamp
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NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
Change F902
Check D201/Q209/Q210 or
D202/Q211/Q212
Check Interface board
Change Q201 or Q202
Change U201
Check Q205/Q207/Q203/D201 or
Q206/Q208/Q204/D202
Check Q209/Q210/C213 or
Q211/Q212/C214
Change PT201or PT202
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FSC B17-1 Service Manual