Brother HL-L5100DN User Manual page 305

10. 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".
11. Turn the edge of the drum unit toward you while looking at the drum surface to find the mark.
• To avoid print quality problems, DO NOT touch the surface of the drum unit, only the edge.
• You can turn the drum unit gear more easily by pulling down the black levers. When you have finished
turning the gear, push the levers back to the original position.
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