Issue
The print is uneven.
Cause and solution
Paper is too moist or too dry.
Replace the paper with new paper in an unopened package. [Usable Paper]
Cause and solution
The toner cartridge has run out of toner, has deteriorated, or is damaged.
Check the amount of toner remaining, and then replace the toner cartridge that is almost empty with a new toner cartridge.
For details on the procedure for checking the amount of the toner remaining and replacing toner cartridges, see the following.
Checking the amount of the toner remaining [Checking the Amount of the Toner Remaining]
Replacing toner cartridges [Replacing Toner Cartridges]