Ac Power Is Absent - Canon CLC 1120 Service Manual

CHAPTER 13 TROUBLESHOOTING
39

AC power is absent.

Cause
Power plug
Power source
------------
Leakage breaker
(ELB; faulty or
off)
Power cord, line
filter (LF1)
Power switch
(SW1)
AC power cut
relay (RL1)
13-130
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Is the power lug connected to the
power outlet?
2 Is the rated AC voltage present at
the power outlet?
3 Is the rated voltage present
between terminal 2 and 6 of the AC
power cut relay (RL1)?
4 Is the switch of the leakage breaker
(ELB) on? Or, is it 0 when both
terminals of the breaker is checked
for electrical continuity?
5 Connect the meter probes to both
terminals of the power switch
(SW1). Is the resistance 0 when
the switch is turned on and
when the switch is turned off?
6 Connect the meter probes to both
terminals of the relay (RL1). Is the
resistance 0 when the switch is
turned on and
is turned off?
Yes/No
NO
NO
YES
NO
YES
NO
NO
YES
when the switch
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Connect the power plug.
Advise the user that this
is not a problem of the
copier.
Go to step 5.
Find out the cause of
activation (why the
breaker has turned on),
and then turn on the
switch.
To find out the cause of
activation, measure the
resistance between the
power cord terminal and
frame GND and across
the power cord
terminals; if it is 0
disconnect AC
connectors in sequence
to pin-point the cause.
Major Causes
· trapping of AC
harness (inside fixing
assembly, deck heater,
etc.).
· faulty AC unit (DCP,
CVR, oil pump driver,
drum heater controller,
SSR) or presence of
foreign matter
Try a check for
electrical continuity
once again; if not 0 ,
replace the leakage
breaker.
Check or replace the
power cord or the line
filter.
Replace the relay (RL1).
Replace the relay.
Check the wiring of the
AC power line and
connectors.