Canon LBP-860, Service Manual

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6
I - 3
Completely blank
Possible cause Step Check
Result Procedure
DC controller About one second the NO Replace the DC controller
PCB motor starts. does the voltage between
PCB.
and
on the DC controller PCB change from
about 5 to 0 V?
High-voltage 2 a test print. About five Y E S Check whether the high-
power supply seconds after the main motor starts, voltage contact Is making
PCB does voltage between O-9 good contact with the
[Developing and 10 on the DC developing bias contact of
bias) controller become about 0.76 the cartridge. If it is,
the high-voltage power
supply PCB. the problem
persists after replacing the
PCB, check by using the
laser malfunction diagnosis
flowchart Section 111 C.
DC controller NO Replace the DC controller
PCB. If the problem persist:
after replacing the PCB,
check by
the laser
malfunction diagnosis
flowchart in Section III C.
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