The toner cartridge is missing or installed incorrectly. Install or reset the toner cartridge.

   Turn the machine off, then wait a few minutes for the machine to cool.

   Using the handle, completely open the front cover.

   Take a new toner cartridge out of its package.

   Holding both handles on the toner cartridge, thoroughly rock it from side to side to evenly distribute the toner.

   Place the toner cartridge on a flat surface, as shown, and remove the paper covering the toner cartridge by removing the tape.

   Make sure that the color of the toner cartridge matches the color slot and then grasp the handles on the toner cartridge. Insert the cartridge until it clicks into place.

   Close the front cover. Make sure that the cover is securely latched, and then turn the machine on.