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.
Figure 3-9 Laser beam exposure
Laser beam
Unexposed area Exposed area
Step 3: Developing
The toner acquires a negative charge from the friction that occurs when the developing cylinder rotates
against the developing blade. When the negatively charged toner comes in contact with the drum, it
adheres to the electrostatic latent image because the drum surface has a higher potential. The image
on the drum becomes visible because of the toner. The AC bias that is superimposed over the develping
negative DC bias is applied to the developing cylinder.
Figure 3-10 Developing
Blade
Developing cylinder
AC bias
DC bias
Photosensitive drum
Unexposed area
Exposed area
Exposed area
Unexposed area
34 Chapter 3 Theory of operation ENWW
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