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Latent-image formation stage
During the latent-image formation stage, the laser/scanner forms an invisible image on the
photosensitive drum in the print cartridge.
Primary charging
Step 1: DC and AC biases are applied to the primary charging roller, which transfers a uniform negative
potential to the photosensitive drum.
Figure 1-18 Primary charging
Primary charging bias
Photosensitive drum
Primary charging roller
Laser beam exposure
Step 2: The laser beam scans the photosensitive drum to neutralize negative charges on parts of the
drum surface. An electrostatic latent image is formed on the drum where negative charges were
neutralized.
Figure 1-19 Laser beam exposure
Laser beam
Unexposed area Exposed area
28 Chapter 1 Theory of operation ENWW