HP 2070N - Manual (Page 83)

Troubleshooting
6 - 12
6
White Spots on black text and
graphics at 75 mm
(3.0 in.) intervals
Black Spots at 75 mm
(3.0 in.) 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.
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.
Note
Do not try to clean the surface of the photosensitive drum with a sharp object.
■
The drum unit may be damaged. Put in a new drum unit. See Replacing the drum
unit on page 5-8.
Examples of poor print
quality Recommendation
75 mm
(3.0 in.)
75 mm
(3.0 in.)
75 mm
(3.0 in.)
75 mm
(3.0 in.)