Charge Corona Unit - Ricoh Aficio Color 6010 Service Manual

30 March, 1999 DRUM UNIT

2.2.3 CHARGE CORONA UNIT

A269D204.WMF
This copier uses a single wire scorotron system to charge the drum. The output of
the charge high voltage power supply is -6 kV.
A grid keeps the surface potential of the drum at –670 V (standard value).
The grid bias voltage is corrected so that the surface potential remains constant by
sensing the surface potential of the drum with the drum potential sensor.
The exhaust fan at the rear of the copier, causes air to flow into the charge corona
unit from front to rear sides. This helps prevent uneven charging.
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