The Output Has White Spots (Horizontal) - Canon iR105 Service Manual

CHAPTER 6 TROUBLESHOOTING

3.3.12 The output has white spots (horizontal)

Developing assembly
1) Does the problem occur at intervals of about 79 mm?
YES: [1] Clean the developing rolls.
Drum
2) Does the problem occur at intervals of about 340 mm?
YES: [1] Clean the drum (especially, where the developing rolls are in
Copy paper
3) Try paper fresh out of package. Is the problem corrected?
YES: The copy paper is moist. Advise the user on the place of storage
Scanner rail, Scanner cable
4) Does the problem occur only in copy images?
YES: [1] Check the scanner cable for foreign matter.
Charging wire (dirt), Photosensitive drum
5) Clean the charging wire. Is the problem corrected?
YES: End.
6) Is there a scratch on the surface of the photosensitive drum?
NO:
YES: Replace the photosensitive drum.
6-80
[2] Dry wipe the surface of the developing cylinder.
[3] If the site of installation is at a high elevation, electrical leak-
age is a possibility between the developing cylinder and the
drum. Try switching DIPSW from UP to DOWN on the high-
voltage PCB (rear of the machine). This, however, lowers den-
sity.
[4] If there is a scratch on the surface of the developing cylinder,
replace the developing cylinder.
contact on both ends).
[2] If there is a scratch on the surface of the drum, replace the
drum.
and the method of storage.
[2] Adjust the scanner cable for tension.
Clean the charging assemblies.
COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR105 REV.0 JULY 2001