COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
CHAPTER 6 TROUBLESHOOTING
6-131
4.1.78 AC power is absent
Power plug
1) Is the power plug connected to the power outlet?
NO: Connect the power plug.
Main power supply
2) Is the rated AC voltage present at the power outlet?
NO: The problem is not of the copier. Advise the user.
Leakage breaker
3) Remove the rear cover. Has the leakage breaker built onto the
power cord base operated (i.e., the switch is at the marking
{{
{{
{)?
NO: Remove the cause of the activation of the leakage breaker, and shift
the switch to the marking “|”.
Power cord, AC driver PCB
4) Try replacing the power cord and the AC driver PCB. Is AC power
supplied?
YES: End.
NO: Check the wiring of the AC power line and the connectors for poor
contact.
Connector
5) When the control panel power switch is turned on, is AC power
supplied to the connector J28 on the DC power supply PCB?
NO: Check the connection of the main controller PCB (J1021) and the
all-day power supply PCB (J785).
All-day power supply PCB
6) When the control panel power switch is turned on, is 3.3 V supplied
to the connectors J1021-1 and -2 on the main controlled PCB?
NO: Replace the all-day power supply PCB.
Power switch (SW1), Wiring
7) Connect the meter probes to both terminals of the power switch
(SW1). Is the resistance 0
ΩΩ
ΩΩ
Ω when the power switch is turned on
and
∞ Ω∞ Ω
∞ Ω∞ Ω
∞ Ω when it is turned off?
NO: Replace the power switch.
YES: Check the wiring of the AC power line. Check the connector for
poor contact.
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