Toner is low or the drum life is exhausted.
Turn
the printer off, then wait a few minutes for the printer to cool.
Open
the front cover.
Holding
the corresponding print cartridges handle, rotate it counterclockwise,
and pull it out to remove from the machine.
Take
a new toner cartridge out of its package.
Holding
the toner cartridge, gently rock it from side to side to distribute
the toner.
Remove
the cartridge cap.
Grasp
the print cartridge and align it with the corresponding slot
inside the machine. Insert it back into its slot until it clicks
into place,
and rotate the print cartridge clockwise.
Close
the front cover. Make sure that the cover is securely latched,
and then turn the machine on.
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