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Functional Overview
: Image formation system
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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 six processes:
Figure 3-4 Image formation block diagram
Toner cartridge
As the heart of the image formation system, the toner cartridge houses the cleaning,
conditioning, and developing steps of the process. The toner cartridge contains the
photosensitive primary charging roller, developing station, toner cavity, and cleaning
station. Including these components (which wear, degrade, or are consumed) in the
replaceable toner cartridge eliminates the need for a service call when replacement is
required. The special photosensitive properties of the drum allow an image to be
formed on the drum surface and then transferred to paper.
CAUTION
The printer's toner cartridge does not include a light-blocking shutter. Be careful to avoid
exposing the drum to light, which can permanently damage the drum. Protect the
cartridge whenever removing it from the printer.
Step 1
Cleaning stage. The cleaning blade is in contact with the surface of the drum
at all times. As the drum rotates during printing, excess toner is wiped off and
stored in the waste toner receptacle.
Step 2
Conditioning stage. This process consists of applying a uniform negative
charge to the surface of the drum with the primary charging roller, located in
the toner cartridge. The primary charging roller is coated with conductive
rubber. An AC bias is applied to the roller to erase any residual charges from
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