2PK/2PL/2PM/2PN
2-1-5
(2) Main charger unit
As the drum rotates in a “clean (neutral)” state, its photoconductive layer is given a uniform, positive (+)
corona charge dispersed by the main charger wire. Due to high-voltage scorotron charging, the charging wire
can get contaminated by oxidization after a long run. Therefore, the charger wire must be cleaned at a specific
interval. Cleaning the charging wire prevents print quality problems such as black streaks.
Figure 2-1-8 Main charger unit
Figure 2-1-9 Drum unit and main charger unit block diagram
1
4
2
3
1. Main charger shield
2. Main charger wire
3. Main charger grid
4. Main charger wire cleaner
Main charger wire
Main charger shield
Main charger grid
Drum
HVPWB
Main charger output
ZEPWB
M
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