Technical Explanation Of Printing Processes; Charge - Dell 3010CN Service Manual

1.3 Technical explanation of printing processes

1.3.1 Charge

In "Charge" process, the surface of drum that rotates at regulated speed is negatively charged
evenly by discharging of BCR (Bias Charge Roll).
BCR contacts the drum at all times, and follows the rotation of the drum.
BCR is a conductive roll, to which negative voltage of overlapped AC voltage is applied from
HVPS and it discharges to the surface of the drum.
Surface of drum is negative charged evenly by DC bias voltage.
The surface of the drum is made of a photoconductor (insulator where not exposed to light,
conductor where exposed) and the inside of it is made of a conductor (aluminum cylinder).
HVPS
Drum surface
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: Negative charge
: Positive charge
Drum
BCR
Potential on
drum surface
-V
0
6 - 3
Chapter 6 Principle s of O peration
Conductor
Photoconducto r
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