HP laserjet 2015 series Manuale Di Servizio
Image-formation system
Laser printing requires the interaction of several different technologies, including electronics, optics,
and electrophotographics, to provide a printed page. Each process functions independently and must
be coordinated with the other printer processes. Image formation consists of the following five
processes:
and electrophotographics, to provide a printed page. Each process functions independently and must
be coordinated with the other printer processes. Image formation consists of the following five
processes:
ł
electrostatic latent-image formation
ł
developing
ł
transfer
ł
fusing
ł
drum cleaning
The five processes contain eight steps.
Figure 5-7
Image-formation system
Step 1: Primary charging
DC and AC biases are applied to the primary charging roller, which transfers a uniform negative
potential to the photosensitive drum.
potential to the photosensitive drum.
Figure 5-8
Primary charging
Step 2: Laser beam exposure
ENWW
Image-formation system
79