The Copy Has White Spots (Horizontal) - Canon GP605 Service Manual

CHAPTER 13 TROUBLESHOOTING
12

The copy has white spots (horizontal).

Cause Step
Developing
assembly
Drum
Copy paper
Scanner rail,
Scanner cable
Charging wire
(dirt)
Photosensitive
drum
13-74
COPYRIGHT © 1999 CANON INC.
1 Does the problem occur at intervals of
about 52 mm?
2 Does the problem occur at intervals of
about 34 mm?
3 Try paper fresh out of package. Is the
problem corrected?
4 Does the problem occur in copy images
only?
5 Are there scratches on the surface of the
photosensitive drum?
Checks
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
YES 1. Clean the
developing rolls.
2. Dry wipe the
surface of the
developing cylinder.
3. If scratches are
found on the surface
of the developing
cylinder, replace the
developing cylinder.
YES 1. Clean the drum.
2. If scratches are
found on the drum,
replace the drum.
YES The copy paper is
moist. Instruct the user
on the correct method
of storing paper.
YES 1. Check the scanner
rail for foreign
matter.
2. Adjust the tension
of the scanner cable.
NO Clean the charging
assembly.
YES Replace the
photosensitive drum.