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Service Guide OKIPAGE4w
Chapter 2 Operation Description
Electro-Photographic Process
(1) Electro-photographic process
The electro-photographic process is outlined below.
1 Charging
The surface of the image drum is given a uniform negative charge by applying DC voltage to the CH
roller.
2 Exposure
Light emitted from the LED head illuminates the negatively charged surface of the image drum. The
surface potential of the lighted surface attenuates to form the electrostatic latent image corresponding to
the image signal.
3 Development and residual toner recovery
The negatively charged toner is brought into contact with the image drum, adhering to the electrostatic
latent image on the image drum by static electricity. This adhesion causes the electrostatic latent image
to change to a visible image.
At the same time, the residual toner on the image drum is attracted to the developing rollerby static
electricity.
4 Transfer
When paper is placed over the image drum surface, the transfer roller applies a positive charge--which is
opposite in polarity to that of the toner--to the reverse side. The toner is attracted by the positive charge
and transfers the toner image from the image drum onto the paper.
5 Cleaning
The cleaning roller temporarily attracts the residual toner on the transferred image drum with static
electricity, then returns the toner to the image drum.
6 Fusing
The transferred toner image is fused to the paper by applying heat and pressure .
Figure 2-5 is a flow diagram of the electro-photographic process.
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