Brother HL-5240 Service Manual page 165

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.
< Examples of poor print quality >
White Spots on black text and
graphics at 94 mm (3.7 in.) intervals
(2) Turn the drum unit gear by hand while looking at the surface of the OPC drum.
(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.
!
CAUTION:
DO NOT clean the surface of the photosensitive drum with a sharp object.
Fig. 4-21
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Black Spots at 94 mm (3.7 in.) intervals
Fig. 4-22
Fig. 4-23
Fig. 4-24
4-51
HL-5240/5250DN/5270DN/5280DW SERVICE MANUAL
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Confidential