SERVICE MANUAL - O. Rensch OHG
SERVICE MANUAL - O. Rensch OHG
SERVICE MANUAL - O. Rensch OHG
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2DC<br />
(2) Main charging<br />
(2-1) Photo conductive drum<br />
The durable layer of organic photoconductor (OPC) is coated over the aluminum cylinder base. The OPC tend to reduce<br />
its own electrical conductance when exposed to light. After a cyclic process of charging, exposure, and development,<br />
the electrostatic image is constituted over the OPC layer.<br />
Since the OPC is materialized by resin, it is susceptible to damage caused by sharp edges such as a screwdriver, etc.,<br />
resulting in a print quality problem. Also, finger prints can cause deterioration of the OPC layer, therefore, the drum (in<br />
the process unit) must be handled with care. Substances like water, alcohol, organic solvent, etc., should be strictly<br />
avoided.<br />
As with all other OPC drums, the exposure to a strong light source for a prolonged period can cause a print quality<br />
problem. The limit is approximately 500 lux for less than five minutes. If the drum (process unit) remains removed form<br />
the copier, it should be stored in a cool, dark place.<br />
Photo conductive layer<br />
Aluminum base cylinder<br />
Figure 2-1-9 Photo conductive drum<br />
2-1-9