Latent-image formation block
During the latent-image formation stage, the laser/scanner forms invisible images on the photosensitive
drums in the print cartridges.
Pre-exposure
Step 1: Light from the pre-exposure LED strikes the photosensitive drum surface. This eliminates the
residual electrical charges on the drum surface.
Figure 1-14 Pre-exposure
Photosensitive drum
LED
Primary charging
Step 2: The dc and ac biases are applied to the primary charging roller, which transfers a uniform
negative potential to the photosensitive drum.
Figure 1-15 Primary charging
Primary charging roller
Primary charging bias
Photosensitive drum
28 Chapter 1 Theory of operation ENWW
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