Canon CLC 1120 Service Manual page 647

CHAPTER 13 TROUBLESHOOTING
21 E074
Cause
Transfer drum HP
sensor (PS57)
Transfer drum
locking motor
(PM5)
DC fuse PCB
Transfer locking
driver PCB
DC driver PCB,
CPU PCB
22 E079
Cause
Transfer drum
cleaner HP sensor
(PS59)
DC fuse PCB
Transfer locking
driver PCB
DC driver PCB,
CPU PCB
13-120
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Is the transfer drum HP sensor
normal? (See the instructions on
how to check photointerrupers.)
2 Replace the transfer drum locking
motor. Is the problem corrected?
3 Is 24 V present between J300-3 and
-4 on the transfer driver PCB and 5
V between J300-1 and-2?
4 Replace the transfer locking driver
PCB. Is the problem corrected?
Step Checks
1 Is the transfer drum cleaner HP
sensor (PS59) normal? (See the
instructions on how to check
photointerrupers.)
2 Is 24 V present between J300-3
and -4 and 5 V between J300-1
and -2 on the transfer driver PCB?
3 Replace the transfer locking driver
PCB. Is the problem corrected?
NO
YES
NO
YES
NO
NO
NO
YES
NO
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
Replace the sensor
(PS57).
End.
Replace the DC fuse
PCB.
End.
Replace the DC driver
PCB or the CPU PCB.
Yes/No Action
Replace the sensor
(PS59).
Replace the DC fuse
PCB.
End.
Replace the DC driver
PCB or the CPU PCB.