Canon CLC 1120 Service Manual page 621

CHAPTER 13 TROUBLESHOOTING
22 The copy has color displacement (entire area; random).
Cause
------------
Photosensitive
drum shaft
Flywheel
Photosensitive
drum drive
assembly
23 The copy has uneven density (at intervals of 1.8 mm).
Cause
------------
Photosensitive
drum shaft
Transfer drum
assembly
13-94
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Generate a grid test print
(TYPE=6), and make a check.
2 Is the screw on the core fixing roll
of the photosensitive drum loose?
3 Is the fixing screw of the flywheel
loose?
4 Is the flywheel mounted at an
angle?
Step Checks
1 Generate a halftone test print using
TYPE=5 (DENS-M/C/Y/K=25,
TXPH=0), and make a check.
2 Is the screw on the core fixing roll
of the photosensitive drum loose?
3 Is the return spring of the jam
removal handle of the transfer
drum displaced?
4 Is the separation charging assembly
mounted to the transfer drum with
a screw other than specified
(M4x6; binding)?
5 Is there damge, dents, or caking of
toner on the photosensitive drum or
the drum flange?
6 Is there dirt or damge on the 300T
gear of the transfer drum?
7 Is there deformation, damge, or
caking of toner on the positioning
rubber ring (FB2-0524), transfer
drum sheet connecting plate,
transfer drum frame, or transfer
sheet?
Yes/No
YES
YES
YES
NO
Yes/No
YES
YES
YES
YES
YES
YES
NO
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Tighten the screw.
Tighten the fixing screw.
Mount the flywheel
properly.
Check the 140T gear and
the 108/20T gear of the
photosensitive drum
drive assembly for
damage and dirt.
Action
Tighten the screw.
Mount the handle
properly.
Use a specified screw.
Clean, or replace the
part.
Clean, or replace the
part.
Clean, or replace the
part.
Check the transfer blade/
attraction brush for
deformation; replace any
deformed part.