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14 - 15 TROUBLESHOOTING AND ROUTINE MAINTENANCE
White Spots on black text
and graphics at 94 mm
intervals
Black Spots at 94 mm
intervals
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 Position the print sample in front of the drum unit, and find the exact
position of the poor print.
2 Turn the drum unit gear by hand while looking at the surface of the
OPC drum.
Caution
Be careful not to touch the photosensitive drum with your fingers.
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.
Caution
Do not try to clean the surface of the photosensitive drum with a sharp
object, such as a ball-point pen, and so on.
The drum unit may be damaged. Put in a new drum unit. (See Replacing
the drum unit
on page 14-29.)
Examples of poor print
quality
Recommendation
94 mm
94 mm
94 mm
94 mm
Photosensitive drum