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7. The copy is foggy (vertical).
8. The copy has black lines (vertical; thick fuzzy lines).
9. The copy has black lines (vertical, fine).
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-54
CHAPTER 10 TROUBLESHOOTING
Checks
Perform the Image Adjustment
Basic Procedure. Is the problem
corrected?
Execute ‘No. 402’ in service mode
(primary charging roller cleaning).
Is the problem corrected?
Clean the scanning lamp, reflect-
ing plate, side reflecting plate,
lens, mirror, and dust-proofing
glass. Is the problem corrected?
Clean the pre-exposure lamp. Is
the problem corrected?
Is the developing cylinder coated
with a uniform layer of toner?
Cause
Primary
charging roller
Scanner
Pre-exposure
lamp
Developing
assembly
Fixing
assembly
Step
1
2
3
4
5
Results
YES
YES
YES
YES
NO
YES
Action
End.
End.
End.
End.
Replace the developing
assembly.
Check and clean the
fixing assembly.
Checks
Make a copy, and turn off the
power switch while the paper is in
the feeding assembly. Are black
lines noted on the copy before it
moves through the fixing
assembly?
Is the transfer guide soiled (in par-
ticular, the upper transfer guide) ?
Are scratches or black lines noted
around the photosensitive drum?
Try wiping the photosensitive
drum with a flannel cloth coated
with toner. Do the lines disap
pear?
Are there scratches or black lines
on the upper fixing film?
Cause
Transfer guide
Photosensitive
drum
Exposure
system
Fixing
assembly
Step
1
2
3
4
Results
NO
YES
YES
NO
YES
NO
Action
Go to step 3.
End.
Replace the drum
cartridge. If scratches
are found, investigate
the cause.
Check the exposure
system.
Replace the upper fixing
unit.
Check the inlet of the
fixing assembly for dirt.