Oki C910, Service Manual, Page: 30 / 282

44043511TH Rev.2
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Oki Data CONFIDENTIAL
2.4.1 Electrophotographic Processing Mechanism
(1) Electrophotographic process
The overview of the electrophotographic process is described below.
Electrification
DC power is applied to the CH roller to evenly negatively electrify the surface of
the OPC drum.
Exposure
The LED head irradiates light on the surface of the OPC drum that is charged
with a negative electrical load. The negative electrical load attenuates according
to the intensity of light, for the irradiation area of the OPC drum surface. Further,
the electrostatic latent image is created on the OPC drum surface according to
the electrical potential.
Development
The negatively charged toner comes in contact with the OPC drum to fuse the
electrostatic latent image by electrostatic force, to create a significant image on
the surface of the OPC drum.
Transfer
Paper is pressed against the surface of the OPC drum, then conveyed by the
transfer roller from behind. The toner and positive electrical load of a reverse
electrode is applied, then the toner image is transferred to the paper.
Cleaning
The cleaning blade removes residual toner on the OPC drum after the toner is
transferred to the paper.
Fuser
Heat and pressure is applied to the toner image on the paper to fuse the image
on the paper.