Lexmark Monochrome Laser Maintenance Manual page 6

To replace the toner cartridge:
1
Open the front door by pressing the button on the left side of the printer and lowering the door.
2
Press the button on the base of the photoconductor kit, and then pull the toner cartridge out using the handle.
3
Unpack the new toner cartridge.
Warning—Potential Damage: When replacing a toner cartridge, do not leave the photoconductor kit exposed to
direct light for an extended period of time. Extended light exposure can cause print quality problems.
4
Rotate the cartridge in all directions to distribute the toner.
Maintaining the printer
6