Theory of Operation 2-19
Xerographics
Print Cartridge
The Print Cartridge is a customer-replaceable item that consists of the following
components:
Drum The Drum is an aluminum cylinder coated with a layer of photoconductive
material that retains electrical charges on its surface until exposed to light, when
electrical conduction occurs.
Bias Charge Roller (BCR) The BCR uniformly distributes electrical charges over
the drum surface, and erases a charge pattern remaining from the previous cycle.
Magnet Roller A thin layer of toner, supplied by the agitator in the toner
compartment, adheres to the surface of this roller, which transports the toner into the
gap between the drum and Magnet Roller.
Charging and Metering (CM) Blade The CM Blade spreads toner into a thin
layer over the Magnet Roller, and applies negative charges to the toner
triboelectrically.
Cleaning Blade The Cleaning Blade scrapes off toner remaining on the drum
surface after the transfer step.
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