Chapter 6

6 - 12

All black
Clean the primary corona wire on the drum unit. (See Cl eaning the corona wir e on
page 6-19.)
If the print quality has not im proved, install a new dru m unit. (See Replacing the
drum unit (DR-2000) on page 6-23.)
White Spots on black text and
graphics at 78.5 mm
intervals
Black Spots at 78.5 mm
intervals
Cleaning the drum unit
Dust, paper powder, glue, and so on may stick to t he surface of the photosensi tive
drum (OPC) and cause black or white spot s to appear on prin ted documents.
Make a few copies of a blank, white sheet of paper. (See Making multiple copies
on page 3-1.)
1 Remove the drum unit and t oner cartridge as sembly, and the n remove the tone r
cartridge from the drum unit.
2 Position the print sample in front of the drum unit so you will know the exact
position on the drum that is causing the poor print.
3 Turn the black gear on th e drum as you chec k the surface of the OPC drum.
Do not touch the OPC dr um with your finge rs.
4 When you find the substance on the drum surface that matches the print
sample, gently dab the surface of the OPC drum with a cotton swab that is lightly
dampened with isopropy l alcohol.
Do not use a scrubbing or wiping motion because thi s might damage the
drum.
Do not try to clean the sur face of the OPC drum with a sharp object , such as
a ball-point pen, because this might cause permanent damage to the drum
unit.
If the print quality still has not improved you need to install a new drum.
(See Replacing the drum unit (DR-2000) on page 6-23.)
Examples of poor print quality Recommendation
78.5 mm
78.5 mm
78.5 mm
78.5 mm
OPC drum surface