CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
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3.9 The copy has a black line (vertical, fine).
Exposure system
1) Generate a halftone test print in service mode. Enter ‘5’ to
COPIER>PG>TYPE. Does the output image have a black line?
NO:
Suspect a fault in the exposure system. Clean it.
Primary charging roller
2) Clean the primary charging roller. Is the problem corrected?
YES: End.
Photosensitive drum
3) Is there a scratch or a black line in the peripheral direction of the sur-
face of the photosensitive drum?
•
Be sure to wipe the black line on the surface of the photosensitive drum
with a cloth coated with toner, and make sure that the black line disappears.
NO:
Replace the drum unit.
•
If there is a scratch, be sure to identify the cause.
Fixing assembly
4) Is there a scratch it the peripheral direction of the fixing roller?
YES: Replace the fixing roller.
NO:
Check the fixing inlet assembly for dirt.
