The drum cartridge is missing or installed
incorrectly. Install or reset the drum cartridge.
Open
the side cover.
Open
the front cover.
Thoroughly
roll the cartridge 5 or 6 times to distribute the drum evenly inside
the cartridge.
Unpack
the new drum cartridge and slide it into place, making sure not
to touch the surface of the drum.
Reinstall
the cartridge and turn the cartridge locking lever downwards.
Close
the front cover, then the side cover.
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