Image-formation system
The image-formation system forms a toner image on media. The product includes four print cartridges
that contain the toner. Toner is applied in the following order, using only the colors necessary for a
specific image: yellow (Y), magenta (M), cyan (C), and black (Bk).
Figure 5-8 Image-formation system
DC controllerHigh-voltage power supply
Laser/scanner unit
Photosensitive drum
Secondary
transfer roller
Primary transfer pad
ITB
Cartridge
Laser beam
ITB cleaning unit
Fuser unit
Image-formation process
Laser printing requires the interaction of several different technologies including electronics, optics, and
electrographics to provide a printed page. Each process functions independently and must be
coordinated with the other processes. Image formation consists of the following processes:
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Latent-image formation
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Development
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Transfer
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Fuser
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ITB cleaning
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Drum cleaning
80 Chapter 5 Theory of operation ENWW
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