Canon NP6320 Service Manual page 211

12. White strips (in cross feed direction)
Cause Step
Developing
assembly
Photosensitive
drum
Copy paper
Scanner rail,
Scanner cable
Dirt on the co-
rona wires
COPYRIGHT © 1999 CANON INC.
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1 Do the white strips occur at intervals of
approx. 63mm? (scratches on developing
cylinder)
2 Do the white strips occur at intervals of
approx. 94mm? (scratches on the photo-
sensitive drum)
3 Does the image become darker when fresh
copy paper is used?
4 Do the white strips occur on the same part
of each copy?
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Checks
YES/
Action
NO
YES 1.Clean the developing
cylinder spacer rollers.
2.Clean the surface of
the developing cylin-
der.
3.If there are scratches
on the surface of the
developing cylinder,
replace the cylinder.
YES 1.Clean the drum.
2.If the drum is
scratched, replace it.
YES The paper may be ab-
sorbing moisture, so in-
struct the use about the
correct method of storing
paper.
YES 1.Check the scanner rail
for foreign matter ad-
hering to it.
2.Adjust the tension of
the scanner drive
cable.
NO Clean each corona as-
sembly (wires and
frame).
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