Step 2: Primary charging
To prepare for latent image formation, a uniform negative potential is applied to the
photosensitive drum surface. The primary charging roller is made of a conductive rubber. DC
bias is applied to the primary charging roller to maintain uniform potential on the drum
surface.
Figure 5-20. Primary charging illustrates this step.
Figure 5-20.
Primary charging
Step 3: Laser beam exposure
As the laser beam scans the drum surface, it neutralizes the negative charge. This is the
electrostatic latent image. The remaining areas, where the laser beam has not struck, retain
a negative charge.
Figure 5-21. Laser beam exposure illustrates this step.
Figure 5-21.
Laser beam exposure
156 Chapter 5 Theory of operation ENWW
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