DRUM UNIT
2-56
A229 SM
2.5.4 DRUM CHARGE
Overview
This copier uses a double corona wire scorotron system to charge the drum. Two
corona wires are needed to give a sufficient negative charge to the drum surface.
The stainless steel grid plate makes the corona charge uniform and controls the
amount of negative charge on the drum surface by applying a negative grid bias
voltage.
The charge power pack [A] gives a constant corona current to the corona wires
(-1200
µ
A).
The bias voltage to the grid plate is automatically controlled to maintain the correct
image density in response to changes in drum potential caused by dirt on the grid
plate and charge corona casing. This is described in the Process Control section in
more detail.
A229D557.WMF
[A]
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