The toner cartridge is missing or is installed
incorrectly.
Install or reseat the toner cartridge.
Pull
the release lever to open the side cover.
Open
the front cover.
Turn
the cartridge locking lever upwards to release the toner cartridge.
Remove
the new toner cartridge from its bag.
Hold
the toner cartridge by the handle and slowly insert the cartridge
into the opening in the machine.
Slide
the new toner cartridge in until it locks in place.
Turn
the cartridge locking lever downwards until it locks in place.
Close
the front cover. Make sure then the side cover.
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