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HP laserjet m712 Guide De Dépannage

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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
  Laser-beam exposure
Laser beam
Photosensitive drum
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 difference
in the electric potential of the drum. The negatively charged toner is attracted to the latent image on the
photosensitive drum because the drum surface has a higher potential. The latent image becomes visible
on the drum.
Figure 1-16
  Developing
Developer blade
Photosensitive drum
Developing roller
Developing bias
ENWW
Image-formation system
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