Ac Power Is Absent - Canon iR8500 Service Manual

4.1.78 AC power is absent

Power plug
1) Is the power plug connected to the power outlet?
NO:
Main power supply
2) Is the rated AC voltage present at the power outlet?
NO:
Leakage breaker
3) Remove the rear cover. Has the leakage breaker built onto the
NO:
Power cord, AC driver PCB
4) Try replacing the power cord and the AC driver PCB. Is AC power
YES: End.
NO:
Connector
5) When the control panel power switch is turned on, is AC power
NO:
All-day power supply PCB
6) When the control panel power switch is turned on, is 3.3 V supplied
NO:
Power switch (SW1), Wiring
7) Connect the meter probes to both terminals of the power switch
NO:
YES: Check the wiring of the AC power line. Check the connector for
COPYRIGHT© 2001 CANON INC.
Connect the power plug.
The problem is not of the copier. Advise the user.
power cord base operated (i.e., the switch is at the marking
Remove the cause of the activation of the leakage breaker, and shift
the switch to the marking "|".
supplied?
Check the wiring of the AC power line and the connectors for poor
contact.
supplied to the connector J28 on the DC power supply PCB?
Check the connection of the main controller PCB (J1021) and the
all-day power supply PCB (J785).
to the connectors J1021-1 and -2 on the main controlled PCB?
Replace the all-day power supply PCB.
(SW1). Is the resistance 0 Ω Ω Ω Ω Ω when the power switch is turned on
and ∞ Ω ∞ Ω ∞ Ω ∞ Ω when it is turned off? ∞ Ω
Replace the power switch.
poor contact.
2000 2000 2000 2000
CHAPTER 6 TROUBLESHOOTING
CANON iR8500/7200 REV.1 AUG. 2001
)?
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