Brother MFC-8710DW - Manual (Page 75)

Routine maintenance
67
A
i
Turn the drum unit gear toward you by
hand while checking the surface of the
suspected area.
j
When you have found the mark on the
drum that matches the drum dot check
sheet, wipe the surface of the drum
gently with a cotton swab until the mark
on the surface comes off.
Important
DO NOT clean the surface of the
photosensitive drum with a sharp object or
any liquids.
k
Turn the drum unit back over.
l
Put the toner cartridge back into the
drum unit until you hear it lock into place.
If you put the cartridge in correctly, the
green lock lever on the drum unit will lift
automatically.
Note
Make sure that you put in the toner
cartridge correctly or it may separate from
the drum unit.