Electrophotographic Process Mechanism - Oki MC561 Maintenance Manual

Oki Data CONFIDENTIAL

2.1 Electrophotographic process mechanism

(1) Electrophotographic process
The electrophotographic process is explained briefly below:
1. Charging
A voltage is applied to the CH roller to electrically charge the surface of the
OPC drum.
2. Exposure
The LED head radiates light onto the charged OPC drum surface in
accordance with an image signal. The electric charge of the radiated part
of the OPC drum surface attenuates depending on the intensity of the light,
thus forming an electrostatic latent image on the OPC drum surface.
3. Development
Charged toner adheres to the electrostatic latent image of the OPC drum by
electrostatic power, and forms a visible image on the OPC drum surface.
4. Transfer
Paper is placed over the OPC drum surface and an electric charge is
applied to it from the backside by the transfer roller, so that the toner image
is transferred to the paper.
5. Fusing
Heat and pressure are applied to the toner image on the paper to promote
its fusion.
6. Drum cleaning
The drum cleaning blade removes toner remaining on the OPC drum after
transfer.
7. Static elimination
Residual potential on the image drum is removed.
8. Belt cleaning
The belt cleaning blade removes toner remaining on the belt.
44473001TH Rev.1
(2) Charging
A voltage is applied to the charging roller, which is placed in contact with the OPC
drum surface, to charge the OPC drum surface.
Power
supply unit
OPC drum
(3) Exposure
The light emitted from the LED head is radiated onto the charged OPC drum
surface. The charge of the radiated part of the OPC drum attenuates according to
the intensity of the light, forming an electrostatic latent image on the OPC drum
surface.
Charging roller
Power
- -
-
supply unit -
- -
-
- -
OPC drum
2. DESCRIPTION OF OPERATION
Charging roller
-
-
-
-
- -
LED head
LED head
OPC drum
Paper
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