Canon LBP-860 Service Manual page 188

Possible cause Step
1
Power supply 2
Laser/scanner 3
unit
PCH
DC controller
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Check
Is connector 5205 on the DC controller
PCB making good contact?
Does the voltage between connectors
the DC controller PCB become about
24 VDC?
between connectors J205-7 (JSCNON)
and 5205.4 (GND) on the DC
controller PCB change from about 5
VDC to 0 V?
Check
controller PCB and connector 5131 of
the main motor making good contact?
About one second after switch is turned
change from about 5 VDC to 0 V?
Result ~ Procedure
present between connectors
controller PCB. If it is not,
Replace the laser/scanner
Replace the DC controller
Result Procedure
NO Reconnect the connectors.
PCB.