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charging bias is applied to the primary charging roller to keep a negative potential on the drum
surface.
Figure 1-14
Primary charging roller
Step 2: Laser-beam exposure
The laser-beam strikes the surface of the photosensitive drum to neutralize the negative charge. An
electrostatic latent image forms where the negative charge was neutralized.
Figure 1-15
Development block
Toner adheres to the electrostatic latent image on the photosensitive drum, which becomes visible.
Step 3: Developing
Toner acquires a negative charge from the friction that occurs when the developing roller rotates
against the developer blade. The developing bias is applied to the developing roller to make a
difference in the electric potential of the drum. The negatively charged toner is attracted to the latent
26
Chapter 1 Theory of operation
Primary charging
Photosensitive drum
Laser-beam exposure
Photosensitive drum
Laser beam
Primary charging bias
ENWW
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Troubleshooting
