Turn off the printer’s power switch, then unplug the printer.
Open the front cover of the printer by pressing the front cover release button.
Take out the drum unit and toner cartridge assembly. When you have just used the printer, some parts inside the printer will be hot. …
Wipe the laser glass with a dry, soft cloth.
Put the drum unit and toner cartridge assembly into the printer.
Close the front cover of the printer.
Plug the printer’s power cord back in, and turn on the printer’s power switch.