Ricoh FT4460, Service Manual, Page: 57 / 413

28 February 1989
2. DRUM CHARGE
2.1 OVERVIEW
This copier uses a single wire scorotron and a highly sensitive OPC drum.
The corona wire [A] generates a corona of negative ions when the charge
power pack applies a high voltage (-5.0 to -7.5 KV). The drum coating [B]
receives a uniform negative charge as it rotates past the corona unit.
A stainless steel grid plate [C] makes the corona charge uniform. The charge
fan [D] provides a smooth flow of air to the interior of the charge corona unit
to prevent an uneven build up of negative ions. (An uneven build up of nega-
tive ions could cause uneven image density.)
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