Brother HL-820 Service Manual page 82

(3) Wipe the surface of the photosensitive drum with a cotton swab until the dust
or paper powder on the surface comes off.
Toner cartridge
Caution:


Do not wipe the surface of the photosensitive drum with something sharp. (ball-point
pen etc.)


Use the cleaning liquid which is a 50-50 mixture of ethyl alcohol and pure water.
I-16 Black band
Possible cause Step
Drum unit 1
Ditto 2
Paper path
Separator
Photo sensitive drum
Fig. 4-4
Check
Is the wire cleaner positioned
at its home position?
Is the corona wire dirty?
IV-15
Cleaning roller
Result Remedy
No Return the wire cleaner to its
home position.
Yes Clean the corona wire.
If the problem still appears
after cleaning, replace the
drum unit.