Brother DCP 8040 - B/W Laser - All-in-One Service Manual page 249

CHAPTER 6 TROUBLESHOOTING
NOTE:
Clean the drum unit as follows:
(1) Remove the toner cartridge from the drum unit. Place the printing samples in front of the
drum unit, and find the exact position of the image defect.
(2) Turn the drum gear by hand while looking at the surface of the photosensitive drum.
(3) Wipe the surface of the photosensitive drum with a cotton swab until the dust or paper
powder on the surface comes off.
!
CAUTION:
Do not wipe the surface of the photosensitive drum with something sharp. (ball-point pen
etc.)
Use cleaning liquid which is a 50-50 mixture of ethyl alcohol and pure water.
Position of smudge on
the drum
94mm interval
Fig. 6-15
Fig. 6-16
Fig. 6-17
6-46
Drum unit
Printing sample
Photosensitive drum
Photosensitive drum