Xerographics - Xerox Phaser 4600 Service Manual

Xerographics

Drum Cartridge
The Drum Cartridge is located under the Toner Cartridge and is reached through the Top Door.
The Drum Cartridge is a customer-replaceable item. The Drum Cartridge consists of OPC
drum unit and the development unit. The OPC drum unit has an OPC drum, a scorotron which
charges the OPC, a light-guide and cleaning blade. The development unit has a magnetic
roller, two mixing augers, developer, a Dr-blade and an ADC sensor.
Figure 1 Drum Cartridge
The OPC drum is charged with a negative voltage and exposed by the Laser Unit. The laser
light creates a latent image on the surface of the OPC drum. The negatively charged toners are
attracted to the latent image. Toner on the OPC drum moves to the media by the positive bias
charge applied to the media by the Transfer Roller. To better understand how the Drum Car-
tridge operates, the name and function for each Drum Cartridge component is listed below.
Table 1 Drum Cartridge Components
Component Function
Drum 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, when electrical conduction occurs.
Magnetic Roller A thin layer of developer and toner adheres to the surface of this
roller, which transports the toner to the Drum surface.
Charging and Metering (Dr) The CM Blade controls the thickness of developer and toner
Blade over the Magnet Roller, and applies negative charges to the
toner.
Cleaning Blade The Cleaning Blade removes toner remaining on the Drum.
Revised
Phaser 4600/4620/4622 Printer Service Manual
Figure 2 Drum Cartridge components
04/2016
8-7
8 Principles of Operation
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