The durm cartridge is not a valid cartridge
for your printer.
Open
the side cover.
Open
the front cover.
Turn
the cartridge locking lever upwards to release the toner cartridge.
Pull
the toner cartridge out.
Pull
the used drum cartridge out.
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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