2-18 Phaser 4500/4510 Service Manual
Theory of Operation
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.
1.Print cartridge 2.Transfer roller
s4500-010
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