Service manual

Image-formation system
Laser printing requires the interaction of several technologies, including electronics, optics, and
electrophotographics, to produce a printed page. Each process functions independently and must be
coordinated with the other product processes. Image formation consists of the following five processes:
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Electrostatic latent-image formation
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Developing
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Transfer
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Fusing
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Drum cleaning
These five processes contain seven steps, which are shown in
Figure 4-9 Image-formation system
on page 43 and described in the following sections.
Figure 4-9 Image-formation system
Step 1: Primary charging
DC and AC biases are applied to the primary charging roller, which transfers a uniform negative potential
to the photosensitive drum.
Figure 4-10 Primary charging
ENWW Image-formation system 43