Image-formation system
The image-formation system forms a toner image on media. The product includes four print cartridges that
contain the toner that is used to create the image on the media. 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 1-9 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
Overview
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:
These processes are divided into nine steps and described in the following sections.
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Latent-image formation
◦
Primary charging
◦
Laser beam exposure
●
Development
●
Transfer
◦
Primary transfer
◦
Secondary transfer
◦
Separation
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Fuser
16 Chapter 1 Theory of operation ENWW
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