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 4-9 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.
Step 3: Developing
The developing cylinder comes in contact with the photosensitive drum to deposit toner onto the
electrostatic latent image.
NOTE The charges on the exposed area of the drum are shown as positive in Figure 4-10
Developing on page 53. The charges are actually negative, but they are more positive than the
charges on the developing cylinder.
Figure 4-10 Developing
ENWW Basic operation 53
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