2FM
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.
C
B
A
MHVDR1
MHVDR
Main charging output
Zener
board
KP-5159
Bias
board
High voltage board
YC-M
CN2-A4
MHVDR2
PSEL2
CN2-A9
Engine board
YC11-5
YC12-9
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