Canon CLC 1120 Service Manual page 682

3 Transfer Drum/Cleaning Assembly
Cause
Transfer drum
sheet
Internal/external
static eliminator
Pre-transfer/post-
transfer sensor
Attraction/transfer
cam HP sensor
Attraction brush,
transfer blade
Pre-cleaning
paper sensor
Internal brush
Transfer drum,
high-voltage cable
Transfer drum
cleaner drive
assembly
Transfer driver
PCB
DC driver PCB
COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Step Checks
1 Is the transfer drum sheet soiled or
deformed?
2 Is the internal/external static
eliminator operating normally?
3 Is the pre-transfer/post-transfer
sensor (PS5/PS6) operating
normally?
4 Is the attraction/transfer cam HP
sensor (PS8) operating normally?
5 Are the brush and the blade
operating normally?
6 Is the pre-cleaning paper sensor
operating normally?
7 Is the internal brush operating
normally?
8 Is leakage caused by damage to the
faston of the transfer high-voltage
cable noted?
9 Is leakage caused by deformation
of the electrode of the charging
block noted?
10 Is there a fault in the transfer drum
cleaner drive assembly? Is it
subjected to overload?
CHAPTER 13 TROUBLESHOOTING
Yes/No
YES Replace the transfer
drum sheet.
NO Check the internal/
external static
eliminator. If leakage is
noted, replace it.
NO Check the wiring; if
normal, replace the
sensor.
NO Check the wiring; if
normal, replace the
sensor.
NO Check the brush and the
blade; if normal, replace
the attraction/transfer
locking cam motor
(PM7).
NO Check that there is no
paper in the cleaner unit;
then, clean the sensor
and execute
COPIER>FUNCTION>
SNS-ADJ>CLN-OFST.
Or, replace the sensor.
NO Check the internal
brush; if normal, replace
the attraction/transfer
locking cam motor
(PM7).
YES Replace the faston of the
high-voltage cable.
YES Correct the electrode
plate of the charging
block.
YES Replace any faulty part.
Remove the cause of the
fault.
NO Replace the transfer
driver PCB or the DC
driver PCB.
Action
13-155