Laser Malfunction - Canon LBP-860 Service Manual

M - 19 Poor Output from High-voltage Power Supply
Possible cause Step
1
M - 20
Faulty Exhaust Fan
Exhaust fan
i

Laser Malfunction

Possible cause Step
DC controller
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Check
Is any terminal of the high-voltage
high-voltage power supply PCB is
replaced?
Check
PCB making good contact?
ON, does the volta@z between
change from 0 V to about 24.5 VDC.
then to aboul VDC?
Check
Result Procedure
YES Clean the terminals of the
high-voltage contact.
YES Replace the high-voltage
power supply PCB.
NO
PCB. If the problem persists
after replacing the PCB.
replace the connector PCB.
Procedure
Reattach the connector.
Replace the exhaust fan.
Replace the DC controller
Procedure
malfunction diagnostic
flowchart in Section III C.
CHAPTER 6