Charge - Lexmark X940e Service Manual

Charge

The Charge Roll 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 remains in darkness.
Light striking the drum discharges the surface charge.
Photoconductive
Surface
Conductive Tube
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.
Photoconductive
Surface
Conductive Tube
Charge roll
(-VDC)
DRUM
Ground
Charge roll
(-VDC)
DRUM
Ground
HVPS
(-VDC)
Ground
Drum Surface
Drum Surface
Image
Voltage
0V
HVPS
(-VDC)
Ground
Drum Surface
Drum Surface
Image
Voltage
0V
7510
-VDC value
-VDC value
1-29
General information