HP LaserJet M1120 Service Manual - Page 59
Image-formation system,
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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: ● Electrostatic latent-image formation ● Developing ● Transfer ● Fusing ● 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