90 Theory of operation ENWW
Electrostatic latent-image-formation block
Step 1: primary charging
A dc bias is applied to the primary charging roller, which transfers a uniform negative potential to
the photosensitive drum.
Figure 20. Step 1: primary charging
Step 2: laser-beam exposure
The laser beam scans the photosensitive drum to neutralize negative charges on parts of the
drum. An electrostatic latent image is formed on the drum where negative charges were
neutralized.
Figure 21. Step 2: laser-beam exposure
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