Fundamentals Of The Electro-Photographic Process - Oki OKIOFFICE 84 Service Manual

3.1 Fundamentals of the Electro-Photographic Process

The electro-photographic process involves six sub-processes:
(1) Charging (2) Exposure (3) Development (4) Transfer (5) Fusing (6) Cleaning
Outline of each process is explained below.
Process Illustration
1 Charging
2 Exposure
3 Development
Service Guide OKIOFFICE 84
Chapter 3 Brief Technical Description
Page: 100
Description
The surface of the
electro-photographic
Image drum is uniformly charged
with negative charges by
applying a negative voltage to
the charge roller.
When the applied DC voltage
exceeds a threshold value,
charging of the drum begins.
Light emitted from the LED head
irradiates the negatively charged
surface.
The potential of the irradiated
part of the Image drum surface
is raised, so that an
electrostatic latent image
associated with the print image
is formed.
Toner is attracted to the exposed
part (high-potential part) of the
Image drum at
the contact between the Image
drum and the developing roller,
making the electro-static latent
image visible.
At the same time, the residual
toner on the Image drum is
attracted to the developing roller
by static electricity.