Lexmark MX421 User Manual page 171

Maintaining the printer
4
Unpack the new imaging unit, and then shake it three times to redistribute the toner.
Warning—Potential Damage: Do not expose the imaging unit to direct light for more than 10 minutes.
Extended exposure to light may cause print quality problems.
Warning—Potential Damage: Do not touch the photoconductor drum. Doing so may affect the quality of
future print jobs.
5
Insert the new imaging unit.
Note: Use the arrows inside the printer as guides.
6
Insert the toner cartridge.
Note: Use the arrows inside the printer as guides.
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