Canon LBP-860 Service Manual page 174

W h e n performing any of the corrective actions described
precautions:
1.
When measuring voltages at designated connector pins, first check the connector for
faulty contacts.
Remove the expansion ROM PCB, ROM SIMM, RAM SIMM. and font card from the
2 .
printer.
When you replace the video controller PCB. remove the EEPROM from the old PCB
3 .
and mount it on the new PCB.
M - l
No AC Power
Possible cause Step
Power plug
breaker
Power supply
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Check
Is the correct voltage present at the
1
outlet?
2 Is the power cord securely plugged
the printer and the outlet?
Is the circuit breaker OFF?
4 Pull out lhe power cord. Measure the
resistance between the two terminals
of the power switch by contacting the
test leads against the terminals. Is the
resistance zero when the switch is
turned ON, and infinite when it is
turned OFF?
below, exercise the following
Result
Procedure
NO Advise the user that the
correct line voltage is not
available at the outlet.
NO Push the power plugs in
firmly.
YES Turn the circuit breaker
ON.
If the breaker turns
OFF again as soon as the
power is switched ON,
check for a short circuit.
Check the AC power line.
NO Replace the power supply.