Image-formation system
The image-formation system consists of the print cartridge, transfer-charging roller, and fuser.
When the formatter sends a print command, the engine controller drives the main motor to rotate the
photosensitive drum, primary-charging roller, developing cylinder, transfer-charging roller, and
pressure roller.
The primary charging roller applies a uniform negative charge to the photosensitive drum surface.
Laser beams, modulated by the signals from the formatter, focus on the photosensitive drum surface
to form a latent image on the photosensitive drum.
The developing cylinder develops the latent image into a visible, toner-based image. The transfer-
charging roller then transfers the toner onto media. Heat and pressure in the fuser bonds the toner to
the print media in order to form a permanent image. The cleaning blade scrapes residual toner from
the photosensitive drum, and the primary-charging roller applies a uniform negative charge to the
photosensitive drum surface in preparation for the next latent image.
Figure 5-9 Image-formation system
98 5 Theory of operation
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