Develop D 16G, Service Manual

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M-10
6-2. PC Drum
• The PC Drum used in this printer is the organic photoconductor (OPC) type.
• The drum consists of two layers - Charge Transport Layer (CTL) and the Charge Gener-
ating Layer (CGL) - applied to an aluminum alloy base (cylinder).
Handling Precautions:
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. Therefore, always wrap the drum in the PC
Drum Cloth or a soft cloth immediately after it has been removed from the printer. Use
utmost care to prevent the surface of the PC Drum from being dirtied.
• Grounding of the PC Drum
The ground contact point (Ground Plate) for the PC Drum is located inside the PC Drum
at its front side. It is, at all times, in contact with the shaft of the front plate of the Imaging
Cartridge. When the Imaging Cartridge is loaded in the printer, the set pin of the front
plate of the Imaging Cartridge contacts a side plate on the printer side, thereby providing
grounding. The potential on the surface of the PC Drum exposed to the laser beam is
then grounded through the Ground Plate, shaft, and set pin to the frame of the printer.
1167M007AA
1139M007AA
CTL
CGL
Aluminum Cylinder
Shaft
PC Drum
Front Plate
4136M514AB
Ground Plate