Oki MC860 MFP, Руководство по обслуживанию

Страница: 31 / 391

43967002TH Rev.1
31 /
Oki Data CONFIDENTIAL
2. Theory of Operation
(1) Electro-photographic process
Outline of the electro-photographic process is described below.
1. Charge
Voltage is applied to the CH roller in order to charge the surface of the OPC
drum.
2. Exposure
The LED head irradiates light in accordance with the image signal on the
charged surface of the OPC drum.
Amount of charge at the irradiated segment on the surface of the OPC
drum is decreased in accordance with strength of irradiated light so that the
electrostatic latent image is created on the surface of the OPC drum.
3. Develop
The charged toner is attracted by the electrostatic latent image on the OPC
so that the toner is developed on the OPC drum surface.
4. Transfer
A print paper is overlaid on the OPC drum surface and the toner image is
transferred to a paper when electric charge is applied to the transfer roller
from the back of a paper.
5. Drum cleaning
The drum cleaning blade removes the residual toner that is remained on the
OPC drum after image transfer.
6. Belt cleaning
The belt cleaning blade removes the residual toner that is remained on the
belt.
7. Fix
Toner is fused when heat and pressure applied to the toner image on the
print paper.
2.1 Electro-photographic process system
(2) Charge
Voltage is applied to the charge roller that is contacting with the OPC drum surface
so that the OPC drum surface is charged.
(3) Exposure
The light that is generated by the LED head is irradiated to the charged surface of
the OPC drum. Amount of charge at the irradiated segment on the surface of the
OPC drum is decreased in accordance with strength of irradiated light so that the
electrostatic latent image is created on the surface of the OPC drum.
-
-
-
-
-
-
Power
supply unit
Charge roller
OPC drum
-
-
-
-
-
-
-
-
-
Power
supply unit
OPC drum
Paper
LED head
OPC drum
LED head
Charge roller