OKIDATA OL400e Series, Service Manual

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Developing
When the negatively charged toner is brought into contact with the image drum surface, it is
attracted to the electrostatic latent image by static electricity, making the latent image visible.
At the same time, the residual toner on the image drum is attracted to the developing roller by
static electricity.
Transfer
Paper is placed over the image drum surface. A positive charge (opposite in polarity to the toner)
is applied to the reverse side of the paper by the transfer roller. The toner is attracted by the positive
charge. The image formed on the image drum is transferred to the paper.
Cleaning
The toner remaining on the image drum after transfer is temporarily attracted to the cleaning roller
by static electricity. This residual toner is accumulated in the image drum cartridge until the drum is
replaced.
Fusing
The toner image transferred to the paper is fused to the paper by heat and pressure.
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