Printronix L5000 Series Maintenance Manual page 168

This voltage differential controls the ions flying from the drum and past the grid. The
ion flow sets up a potential of approximately +580 volts on the surface of the drum
as it rotates under the metal channel. The drum surface potential is then monitored
after the ensuing exposure step, and the main charger current is controlled according
to the results of that monitoring.
LED Discharge Lamp
5–8
Photoreceptor Drum
Drum Surface
Low Positive Voltage
Exposed Portion
(Low Positive
Voltage)
Main Charger
Grid
Light Dark
High Positive Voltage
Selenium
Photo-Conductive
Material
Conductive Base
Material
Non-exposed
Portion
(High Positive
Voltage)
Principles of Operation