9. Imaging unit
Theory of Operation Ver. 1.0 Apr. 2005
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Composition/Operation
9.3
PC Drum
• The PC Drum used in this copier is the organic photoconductor (OPC).
✽
The drum is a lamination of the Charge Transport Layer and Charge Generating Layer
coating an aluminum alloy base.
Handling Precaution
• The PC Drum of this type exhibits light fatigue after being exposed to light for a
long time, which results in its sensitivity being changed. Always, therefore, wrap
the drum in the PC Drum Cloth or a soft cloth immediately after it has been
removed from the copier. Utmost care should also be used when handling the PC
Drum to ensure that its surface is not contaminated.
9.4
Grounding of the PC Drum
• The ground contact (Ground Plate) of the PC Drum is located on the inside on its left-
hand side. It remains in contact with the drum shaft at all times. When the Imaging Unit is
loaded in the copier, the drum shaft comes into contact with the Ground Plate of the PC
Drum. The potential on the surface of the PC Drum exposed to the laser beam is then
grounded through the Ground Plate to the frame of the copier.
1139M007AA
Charge Transport Layer
Aluminum Base
Charge Generation Layer
(PC Drum Cross-Section)
PC Drum
1167M007AA
4021M010AA
PC Drum
Frame
Ground Plate
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