HL-5240/5250DN/5270DN/5280DW SERVICE MANUAL
Confidential
4-51
NOTE:
Clean the drum unit as follows.
(1) Put the print sample in front of the drum unit, and find the exact position of the poor print.
Fig. 4-21
< Examples of poor print quality >
94 mm
(3.7 in.)
94 mm
(3.7 in.)
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Fig. 4-22
(2) Turn the drum unit gear by hand while looking at the surface of the OPC drum.
Fig. 4-23
(3) When you have found 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. 4-24
!
CAUTION:
DO NOT clean the surface of the photosensitive drum with a sharp object.
White Spots on black text and
graphics at 94 mm (3.7 in.) intervals
Black Spots at 94 mm (3.7 in.) intervals
