2G6
2-1-9
(2-2) Charging the drum
The following shows a simplified diagram of the electrophotographic components in relation to the engine system.
Charging the drum is done by the main charger unit (A).
Figure 2-1-9 Charging the drum
As the drum (C) rotates in a “clean (neutral)” state, its photoconductive layer is given a uniform, positive (+) corona
charge dispersed by the main charger wire (B).
Due to high-voltage scorotron charging, the charging wire can get contaminated by oxidization after a long run.
Therefore, it must be cleaned periodically from time to time. Cleaning the charging wire prevents print quality problems
such as black streaks.
(B)
(C)
(A)
MHVDR1
MHVDR
Main charging output
Zenner
PWB
KP-1109
Bias
PWB
High voltage unit
YC-M
CN2-A4
MHVDR2
PSEL2
CN2-A9
Engine PWB
YC11-5
YC12-9
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