Epson AcuLaser C1900, Service Manual

Page: 98 / 270

EPSON AcuLaser C1900/AcuLaser C900 Revision B
Operating Principles Description of Mechanisms 98
2.4.2 Photoconductor Unit
2.4.2.1 OPC Drum
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OPC (Organic Photoconductor):
This photoconductor is of a laminate type consisting of a carrier generation layer
and an electric charge retaining layer applied onto an aluminum base (cylinder).
Figure 2-6. OPC Drum (Organic Photoconductor)
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Grounding of OPC drum
The grounding contact of the OPC drum is located in its rear inside and always in
contact with the shaft. When the Photoconductor Unit is installed in the printer
body, the shaft of the Photoconductor Unit comes in contact with the grounding
plate in the printer body to achieve grounding. Thus, the electric charge on the
OPC drum exposed to light is grounded through the Grounding Contact, the Shaft
and the Grounding Plate to the Frame.
Figure 2-7. Grounding of OPC drum
C A U T I O N
The organic photoconductor can deteriorate by sensitivity change
due to light fatigue if is exposed to light for an extended period of
time. To prevent such deterioration, when the OPC Drum has
been taken out of the printer body, cover it with a clean soft cloth
to protect it from exposure to light.
In handling the Photoconductor Unit, take great care that no dirt
adheres to the surface of the photoconductor.
1167M007AA
1139M007AA
Electric charge retaining layer
Carrier generation layer
Aluminum base
Shaft
Grounding
Plate
Grounding Contact
OPC Drum