The Copy Has White Spots (Horizontal) - Canon iR8500 Service Manual

CHAPTER 6 TROUBLESHOOTING

3.3.12 The copy has white spots (horizontal)

Developing assembly
1) Does the problem occur at intervals of about 58 mm or 79 mm?
YES: Perform the following:
Drum
2) Does the problem occur at intervals of about 340 mm?
YES: Perform the following:
Paper
3) Try fresh paper. Is the problem corrected?
YES: The paper is moist. Advise the user on the correct method of stor-
Scanner rail, Scanner cable
4) Does the problem occur only in copy images?
YES: Perform the following:
Charging wire
5) Does the problem occur at even intervals?
YES: Clean each charging wire.
Photosensitive drum
6) Is there a scratch on the surface of the photosensitive drum?
NO:
YES: Replace the photosensitive drum.
6-86
1. Clean the developing members.
2. Dry wipe the surface of the developing cylinder.
3. If a scratch is found on the surface of the developing cylinder,
replace the developing cylinder.
1. Clean the drum.
2. If a scratch is found on the surface of the drum, replace the
drum.
ing paper (place).
1. Check the scanner rail for foreign matter.
2. Adjust the tension of the scanner cable.
Clean the charging assemblies.
COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001