e Turn the drum unit gear by hand while looking at the surface of the OPC drum (1).
1 
Routine maintenance
g 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 will lift automatically.
A
f When you have found the mark on the drum that matches the print sample, wipe the surface of the OPC drum with a dry cotton swab until the dust or glue on the surface comes off.
h Put the drum unit and toner cartridge assembly back in the machine.
IMPORTANT
DO NOT clean the surface of the photosensitive drum with a sharp object or any liquids.
i Close the front cover.
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