Oki B6200 Series, Maintenance Manual

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Chapter 6 Principle of Operation
1. Summary of Print Process
Electrophotography is used in JIGEN printer to print image on paper using a video signal sent from the
PWBA ESS to the MCU of the HVPS/MCU. The electrophotography is composed of the following 7
steps.
(1) Charging
Negative charges are uniformly distributed over the surface of the drum by Bias Charge Roll.
(2) Exposure
The laser scanner scans the surface of the drum with a quite thin laser beam modulated
according to the signal from the PWBA ESS (controller), to create an invisible electrostatic latent
image on the drum surface.
(3) Development
During development, toner particles are attracted to the electrostatic latent image on the drum
surface. Thus, a visible toner image is created.
(4) Transfer
The toner image is transferred from the drum surface to the paper.
(5) Peeling
Electric charges on the paper are partially neutralized. As a result, the paper is peeled off from
the drum surface.
(6) Fixing
The toner image is permanently fixed to the paper by heat and pressure.
(7) Cleaning
The remaining toner is removed from the drum surface.
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Summary of print process
By rotating the drum, the surface undergoes various steps including charging, exposure, development,
transfer, peeling, and cleaning. A toner image is created on the surface of the drum and transferred to
the paper. The paper is subjected to some steps including transfer, peeling, and fixing by the paper
transport mechanism. When the paper is placed in position relative to the image, the toner image is
transferred to the paper from the drum surface, and then fixed.
JG6101AA
1. Charging 3. Development 4. Transfer
Paper Feeding
5. Peeling 6. Fixing
Print out
2. Exposure
: Flow of paper
: Transfer process
7. Cleaning
Next print cycle