Canon NP6330 Service Manual page 405

CHAPTER 11 TROUBLESHOOTING
Step
Cause
8
Blank exposure
assembly
9
Outside light
12 The copy has white spots. (horizontal)
Step
Cause
1
Developing
assembly
2
3
Photosensitive
drum
4
Copy paper
5
Scanner rail,
scanner cable
Charging wire
11-64
COPYRIGHT © 1997 CANON INC.
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Checks
Does the blank shutter solenoid
operate where white spots or
white lines occur in the copy
image while the scanner is moving
forward?
Is the photosensitive drum
exposed to light from outside?
Checks
Is the problem noted at intervals
of about 3.3 cm? (scratches on
the developing cylinder)
Execute "408" in service mode [4].
Is the problem corrected?
Is the problem noted at intervals
of about 9.4 cm? (scratches on
the photosensitive drum)
Try fresh copy paper.
Is the problem corrected?
Is the problem noted at the same
location on all copies?
YES/NO
NO
YES
YES/NO
YES
YES
YES
YES
YES
NO
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Check the blank
exposure assembly.
Find out the cause of the
infiltration of light.
Action
1. Clean the developing
rolls.
2. Clean the surface of
the developing
cylinder.
3. If scratches are
found on the surface
of the developing
cylinder, replace the
developing cylinder.
End.
1. Clean the drum.
2. If scratches are
found on the drum,
replace the drum
unit. (Be sure to find
out the cause of the
scratches.)
The copy paper may be
moist; advise the user
on the correct method of
storage.
1. Check the scanner
rail for foreign matter.
2. Adjust the tension of
the scanner cable.
Clean each charging
wire. If the dirt cannot be
removed, replace the
charging wire.