The Copy Has A White Spot (Horizontal) - Canon iR2200 Service Handbook

3.12 The copy has a white spot (horizontal).

Exposure system
1) Generate a halftone test print in service mode. Enter '4' to the follow-
ing: COPIER>PG>TYPE. Does the output image have a white spot?
NO:
Developing assembly
2) Does the problem occur at intervals of about 35 mm?
YES:
•
•
•
Drum unit
3) Does the problem occur at intervals of about 94 mm?
YES:
•
•
Paper
4) Try paper fresh out of package.
YES: The paper may be moist. Advise the user on the correct method of
Transfer charging roller, Developing bias
5) Is there a white spot on the photosensitive drum during copying opera-
tion?
NO:
YES: Check the developing bias.
CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Go to step 4.
Clean the developing block members.
Dry wipe the surface of the developing cylinder.
If a scratch is found on the surface of the developing cylinder, re-
place the developing cylinder.
Clean the drum.
If a scratch is found on the drum, replace the drum unit.
storing paper.
Check the transfer charging roller for leakage.
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