Brother HL-L8250CDN User Manual page 167

Routine Maintenance
k
Use the numbered markers next to the drum roller to find the mark. For example, a cyan dot in column 2
on the check sheet would mean that there is a mark in the "2" region of the cyan drum.
l
Turn the drum unit gear and the edge of the drum unit toward you using both hands while looking at the
surface of the suspected area.
IMPORTANT
To avoid print quality problems, DO NOT touch the surface of the drum unit.
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