Drum Charge - Ricoh FT5540 Service Manual

31 August 1989

2. DRUM CHARGE

This copier uses a dual wire corotron unit and a highly sensitive selenium drum. The corona
wires [A] generate a flow of positive ions when the charge power pack applies a high positive
voltage to the corona unit. The drum coating [B] receives a uniform positive charge as it
rotates past the corona unit.
The charge fan [C] provides a smooth flow of air to the interior of the charge corona unit [D]
to prevent uneven build up of positive ions. (An uneven build up of positive ions could cause
uneven image density.)
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