Chapter 2 Principles Of Operation; Engine; Summary Of Print Process - Oki B930 Service Manual

Chapter 2

Engine

Summary of Print Process

Electrophotography is used in the FIO printer to print image on paper using a video signal sent
from the PWBA ESS to the PWBA MCU F. The electrophotography is composed of the following
7 steps.
1. Charging
Negative charges are uniformly distributed over the drum surface by the Bias Charge Roll.
2. Exposure
The laser scanner scans the drum surface with a laser beam modulated with the signal from
the PWBA ESS (controller), to create an invisible electrostatic latent image on the drum sur-
face.
3. Development
During development, toner particles are attracted to the electrostatic latent image on the
drum surface, forming a visible toner image.
4. Transfer
The toner image is transferred from the drum surface to the paper.
5. Detack
Electric charges on the paper are partially neutralized. As a result, the paper is stripped off
the drum surface.
6. Fusing
The toner image is permanently fixed to the paper by heat and pressure.
7. Cleaning
The remaining toner is removed from the drum surface.
• Summary of print process
1. Charging 2. Exposure
By rotating the drum, the drum surface undergoes various steps including charging, exposure,
development, transfer, detack, and cleaning. A toner image is created on the drum surface and
transferred to the paper. The paper is subject to the transfer, detack, and fusing steps by the
paper transport mechanism. When the paper is positioned relative to the image, the toner image
is transferred to the paper from the drum surface, and then fused.
Main components directly associated with the print process and paper transport are illustrated in
the following figures.
• Components associated with print process
Principles of Operation
Paper Feeding
3. Development 4. Transfer
Next print cycle
5. Detack 6. Fusing
7. Cleaning
Print out
: Flow of paper
: Transfer process
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