Brother HL-B2180DW Online User's Manual page 200

9. Use the numbered markers next to the drum roller to find the mark on the drum. For example, a dot in column
2 on the check sheet means that there is a mark in drum region "2".
10. Rotate the wheel at the end of the drum unit while pushing the shaded part, as shown in the illustration, to
find the mark or foreign material.
IMPORTANT
To avoid print quality problems, DO NOT touch the surface of the drum unit, only the wheel on the end.
11. Wipe the drum unit surface gently with a dry cotton swab until the mark or foreign material on the surface
comes off.
NOTE
DO NOT clean the surface of the photosensitive drum with a sharp object or any liquids.
12. Reinsert the toner cartridge and drum unit assembly back into the machine.
13. Close the front cover of the machine.
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