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5-14 WorkCentre Pro 421 User Guide
Replacing the Drum Cartridge
The Drum Cartridge requires replacement when the “Replace
Drum” message is displayed at 30,000 copies. A “Drum Life”
warning is displayed after approximately 29,000 copies. The kit
contains a new Drum Cartridge and a new Ozone Filter.
CAUTION:Do not expose the green drum to light for an
extended period. Never expose the drum to direct
sunlight or touch the drum surface. Damage or poor
image quality may result.
NOTE: If the WorkCentre Pro 421 does not include the Auto
Duplex Unit, skip the first step.
To open the Auto Duplex Unit,
release the lever located at
the front of the Auto Duplex
Unit.