Lexmark MS510 Service Manual page 298

Step 1: Charge
During the charge step, voltage is sent from the HVPS to the charge roll beside the photoconductor. The charge roll
applies a uniform negative charge over the entire surface of the photoconductor to prepare it for the laser beam.
Photoconductive
Surface
Conductive Tube
Charge roll
(-VDC)
DRUM
Ground
Appendix C: Theory of operation
298
4514-630, -635, -636, -638, -639, -649
HVPS
(-VDC)
Ground
Drum Surface
Drum Surface
Image
Voltage
0V
-VDC value