Canon CLC 1120 Service Manual page 629

CHAPTER 13 TROUBLESHOOTING
6 E013
Cause
Waste toner
feedscrew
Waste toner
feedscrew lock
detecting switch
(SW7)
DC driver PCB,
CPU PCB
7 E014
Cause
------------
Fixing roller drive
assembly
Fixing oil
application system
DC fuse PCB
Fixing motor
(M5)
DC driver PCB,
CPU PCB
13-102
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Is the waste toner feedscrew drive
gear pushing the waste toner
feedscrew lock detecting switch
(SW7)?
2 Is the voltage between J1012-A2
(+) and J1012-A1 (-) on the DC
driver PCB about 5 V when the
switch is pressed and about 0 V
when the switch is released?
Step Checks
1 Does the fixing motor rotate at
specific timing during copying
operation?
2 Does the fixing motor start to rotate
at specific timing during copying
operation?
3 Is the fixing roller coated with
fixing oil?
4 Is 24 V present between J374-1
and -2 of the fixing motor.
5 Set the meter range to 5 VDC, and
measure the voltage between
J1026-B9 (+; FXMON) and J1026-
B10 (-; GND) on the DC driver
PCB.
Does it change from about 0 to
about 5 V when the power switch
is turned off and then on and when
the fixing motor starts to rotate?
Yes/No
YES
NO
YES
Yes/No
YES
YES
NO
NO
YES
NO
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
The feedscrew inside the
waste toner pipe may be
prevented from rotating.
Remove the waste toner
pipe, and try turning the
feedscrew by and.
If it can be turned easily,
mount it back once
again, and see what
happens. If it cannot be
turned easily, replace the
waste toner pipe, and
remove the cause.
Replace the switch.
Replace the DC driver
PCB or the CPU PCB.
Action
Go to step 5.
Check the fixing roller
drive system for
overload.
Check the fixing oil
application system (e.g.,
fixing oil pump).
Check the voltage
between J935-1 and -3
of the DC fuse PCB. If it
is not 24 V, replace the
DC fuse PCB.
Check the wiring from
J1026 to the fixing
motor; if normal, replace
the fixing motor.
Replace the DC driver
PCB or the CPU PCB.