Developing Section - Printronix L5000 Series Maintenance Manual

In the photoconduction section, the drum potential changes as indicated below.
Max.
The dark area potential indicated above is monitored by the drum surface
electrometer. The current flowing to the main charger is adjusted in accordance with
the difference between the detected and target potentials.
Although the maximum charge is 700 volts, the printer is charged to 580 volts.
Do not exceed 580 volts, as print quality will deteriorate.

Developing Section

In the developing section, toner is attracted to the electrostatic latent image formed in
the exposure step, so that a visible image is formed on the drum surface. The
developing section houses a cartridge that contains toner, which is a fine black
powder. Whenever the printer senses that it is low on toner, a mechanism drops toner
into the developer unit auger. The auger holds carrier beads, which are big, rough
and heavy particles. When the printer is on, toner is constantly rubbing against carrier
beads. This combination is called developer compound. The friction creates an
electrostatic field.
5–10
580 V
IMPORTANT
CARRIER
BEAD
TONER
50 V
DEVELOPER
COMPOUND
Principles of Operation