Canon NP6317 Service Manual page 195

12. White strips (in cross feed direction)
Cause/Problem
Procedure
area
Developing 1
assembly
Photosensitive 2
drum
Copy paper 3
Scanner rail, 4
Scanner cable
Dirt on the co-
rona wires
COPYRIGHT © 1999 CANON INC.
Check
Do the white strips occur at intervals of
approx. 63mm? (scratches on developing
cylinder)
Do the white strips occur at intervals of
approx. 94mm? (scratches on the photo-
sensitive drum)
Does the image become darker when fresh
copy paper is used?
Do the white strips occur on the same part
of each copy?
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Result
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 or
the CT unit.
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).
Action
10-31