CHAPTER 11 TROUBLESHOOTING
COPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
11-63
10
The copy has white spots. (vertical)
11
The copy has white lines. (vertical)
Cause
Fixing assembly
Primary
charging
assembly
Developing
assembly
Copy paper
Photosensitive
drum
Transfer char-
ging assembly
Static eliminator
Checks
Make a copy while keeping the
copyboard cover open. Turn off
the power switch while the copy
paper is moving through the
feeding assembly. At this time,
does the copy image before the
paper goes throughout the fixing
assembly have white spots or
white lines?
Clean the charging wire, grid, and
shielding plate of the primary
charging assembly. Is the problem
corrected?
Is the coating of toner on the
developing cylinder even?
Try fresh copy paper. Is the
problem corrected?
Are there scratches in the
peripheral direction of the surface
of the photosensitive drum?
Clean the transfer charging wire.
Is the problem corrected?
Clean the static eliminator. Is the
problem corrected?
Step
1
2
3
4
5
6
7
YES/NO
YES
YES
NO
YES
YES
YES
YES
Action
1. Clean the inlet guide
of the fixing
assembly.
2. Check to find out if
the cleaning belt is
taken up properly.
3. Check and clean the
separation claws.
Dry wipe the part with
lint-free paper; then,
clean it with alcohol. If
the dirt cannot be
removed, replace the
charging wire.
Check the edge of the
blade of the developing
assembly for paper lint
and dust. If there is not
toner inside the
developing assembly,
see “The Add Toner
indicator fails to turn off.”
The copy paper may be
moist; advise the user
on the correct method of
storage.
Replace the drum unit.
(Be sure to find out the
cause of the scratches.)
Dry wipe with lint-free
paper; then, clean it with
alcohol. If the dirt cannot
be removed, replace the
charging wire.
End.