Brother HL-1870N - Page 231

HL-1850/1870N SERVICE MANUAL
6-47
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.
Fig. 6-31
(2) Turn the drum gear by hand while looking at the surface of the photosensitive drum.
Fig. 6-32
(3) Wipe the surface of the photosensitive drum with a cotton swab until the dust or paper
powder on the surface comes off.
Fig. 6-33
!
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
Printin
g
sam
p
le
Drum unit
Photosensitive drum
Photosensitive drum