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CHAPTER 4 TROUBLESHOOTING
4-15
Image default examples Recommendation
94 mm
(3.7 in.)
94 mm
(3.7 in.)
White Spots
Printed pages have white spots in
black text and graphics at
intervals of 94 mm.
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Black Spots
Printed pages have black spots at
intervals of 94 mm.
•
If the problem is not solved after printing a few
pages, the drum unit may have glue from label stock
on the OPC drum surface.
Clean the drum unit as follows
(1)Place the printing samples in front of the drum
unit, and find the exact position of the image
defect.
Fig.4-9 Find the exact position of the image defect
(2)Turn the drum unit gear by hand while looking
at the surface of the OPC drum.
Fig. 4-10 Turn the drum gear
(3) When you have located the mark on the drum
that matches the print sample, wipe the surface
of the OPC drum with a cotton swab until the
dust or paper powder on the surface comes off.
Fig. 4-11 Wipe the surface of the OPC drum
!
Caution
Do not try to clean the surface of the photosensitive
drum with anything sharp such as a ball-point pen
etc.
•
The drum unit may be damaged. Install a new drum
unit. See “How to replace the Drum unit” in Chapter
3.