The Background Is Generally Dark

Troubleshoot by checking in the following order:

Are White Areas Generally Dark?

Setting [Prevent Fogging] to [On] may solve the problem.

[Home] screen on the control panel

[Menu]

[Adjustment/Maintenance]

[Adjust Image Quality]

[Special Processing]

[Prevent Fogging]

[On]

* When you select [On], the print density may decrease.

Check the Remaining Amount of Toner in the Toner Cartridge.

Check the remaining amount of toner in the toner cartridge. Replace the toner cartridge if the remaining amount of toner is low.
Checking the Remaining Amount of Consumables
Replacing the Toner Cartridge

* Depending on the usage condition of the machine, the actual remaining amount of toner may be lower than indicated or the parts may be deteriorated. If the problem persists, replace the toner cartridges.