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(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.
Main charger wire
1
Figure 2-1-8 Main charger unit
1. Main charger shield
2. Main charger wire
3. Main charger grid
4. Main charger wire cleaner
Drum
ZEPWB
Figure 2-1-9 Drum unit and main charger unit block diagram
2
4
3
Main charger output
Main charger shield
Main charger grid
2-1-5
2MH/2MJ/2MK/2ML
M
HVPWB
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