Diagnostic aids 3-53
5058-030
Step1: Charge
Voltage is sent from the high-voltage power supply (HVPS) to the charge roll, which places a uniform negative
electrostatic charge on the surface of the drum. The drum surface is made of a photoconductive material that
holds an electrical charge as long as the drum is not exposed to light. Light striking the drum causes the surface
charge to neutralize.
The charge roll is a conductive roll that is positioned slightly above the surface of the drum. The HVPS supplies
the charge roll with two voltages: a negative DC charge voltage and an AC discharge voltage that is used for
electrically cleaning the drum.
HVPS
(-VDC)
(-VDC)
Ground
Conductive Tube
Photoconductive
Surface
0V
-VDC value
DRUM
Drum Surface
Voltage
Drum Surface
Image
Ground
Charge roll
HVPS
(-VDC)
(-VDC)
Ground
Conductive Tube
Photoconductive
Surface
0V
-VDC value
DRUM
Drum Surface
Voltage
Drum Surface
Image
Ground
Charge roll
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