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 1-16 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 have been neutralized where they 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 1-17 Development
Developer roller
Developing bias
Photosensitive drum
Developer blade
36 Chapter 1 Theory of operation ENWW
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