Canon CLC 1120 Service Manual page 599

CHAPTER 13 TROUBLESHOOTING
5 The copy has vertical lines.
Cause
------------
------------
Primary charging
wire cleaner
Cleaning
Developing
assembly
Transfer charging
assembly
Transfer
separation claw
13-72
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Clean the primary charging
assembly, dust-proofing glass,
reflecting mirror, and lens. Is the
problem corrected?
2 Is the problem noted in all colors
on a halftone test print (TYPE=5)?
3 Is the cleaner of the primary
charging wire found in the middle
of its path?
4 Is paper or foreign matter stuck on
the cleaning blade of the
photosensitive drum cleaner
assembly?
5 Is there deformation or damage on
the edge of the cleaning blade?
Feel the edge of the cleaning blade
(with your finger) to check the
presence/absence of scratches.
6 Are the vertical lines relatively
wide and fuzzy?
7 Is the problem noted for all colors?
8 Is the transfer blade or the transfer
blade protective sheet warped or
faulty?
9 Are there traces of the separation
claws in the images?
Yes/No
YES
NO
YES
YES
YES
YES
NO
YES
YES
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
End.
Go to step 13.
Check the motor of the
cleaner.
Remove the foreign
matter, and clean the
cleaning blade and the
outside of the cleaner
assembly.
If deformation or
damage is found,
remove the cause, and
replace the cleaning
blade.
Check the waste toner
feedscrew to see
whether it is rotating; as
necessary, apply grease.
Check to see if waste
toner has spread under
the cleaning blade; as
necessary, remove waste
toner.
Check the developing
assembly and the
developing cylinder for
which the problem is
noted; if a fault is found,
clean or replace the part.
Correct the warping of
the transfer blade. Or,
replace the transfer
charging assembly.
Increase the setting of
ADJUST>HV-SP>HV-
SP in service mode;
however, keep in mind
that too high a setting
can cause image
distortion.