2GL/2FV/2FW
2-1-4
(2) Main charger unit
As the drum rotates in a “clean (neutral)” state, its photoconductive layer is given a uniform, positive (+) corona charge dis-
persed by the main charger wire. Due to high-voltage scorotron charging, the charging wire can get contaminated by oxi-
dization after a long run. Cleaning the charging wire prevents print quality problems such as black streaks.
Figure 2-1-4 Main charger unit
Figure 2-1-5 Drum unit and main charger unit block diagram
Drum
(1) Main charger shield
(2) Main charger wire
(3) Main charger grid
(4) Main charger wire cleaner
Main
charger
wire
Main charger output
Grid
Shield
Drum
Engine/high
voltage PWB
Zener
PWB
470 15 V DC
250 10 µA (default)
Drum surface
potential
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