Step 3: Laser-beam exposure
The laser beam strikes the surface of the photosensitive drum in the areas where the image will form. The
negative charge neutralizes in those areas, which are then ready to accept toner.
Figure 1-15 Laser-beam exposure
Photosensitive drum
Laser beam
Step 4: Development
Toner acquires a negative charge as the developing cylinder contacts the developing blade. Because the
negatively charged surface of the photosensitive drums has been neutralized where the drums have been
struck by the laser beam, the toner adheres to those areas on the drums. The latent image becomes visible on
the surface of each drum.
Figure 1-16 Developing
Developer blade
Developer roller
Developing bias
Photosensitive drum
26 Chapter 1 Theory of operation ENWW
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