Imaging Unit - Xerox Phaser 7400 Service Manual

Imaging Unit

The function of each Imaging Unit component is listed in the following table.
Imaging Unit Components
Component
Drum
Bias Charge Roller (BCR)
Developer Roller
Sponge Roller
Agitation Bar
Cleaning Blade
Waste Toner Recovery
Toner Cartridge
Agitation Spring
Charge Roller
Theory of Operation
Function
The Drum is an aluminum cylinder coated with a layer of photo-
conductive material that retains electrical charges on its surface
until exposed to light.
The BCR uniformly distributes electrical charges over the drum
surface, and erases the previous charge pattern.
A thin layer of developer and toner adheres to the surface of this
roller, which transports the toner to the Drum surface.
Transfers toner to the Developer Roller.
The Agitation Bar stirs the developer mixture to achieve a
uniform distribution of toner.
The Cleaning Blade removes toner remaining on the Drum.
Moves excess toner from the Imaging Unit to the Waste Toner
Recovery system for collection.
Shutter
Agitation Bar
Target
Drum
Sponge Roller
Developer Roller
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