Xerox 4400DT Service Manual - Page 418
Print Process Description, Charge
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Print Process Description Charge The Bias Charge Roller (BCR) places a uniform negative electrostatic charge on the drum surface. The drum surface is made of a photoconductive material that holds the electrical charge as long as the drum remains in darkness. Light striking the drum discharges the surface charge. The BCR is a conductive roller that is positioned slightly above the surface of the drum. The HVPS PWB supplies the BCR with two voltages: a negative DC charge voltage and an AC discharge voltage. The negative DC voltage creates a uniform negative charge across the surface of the drum. The AC voltage removes any residual DC charge that was left from the previous print cycle. Block Diagram of the Drum Charge Process - Side View Phaser 4400 Laser Printer Service Manual 8-5
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