106 Theory of operation C7085-90921
Laser exposure
Photoconductive material, in the absence of light, allows the negative charge the charging roller
placed on the imaging drum’s surface to remain in place. Areas of the photoconductor that are
exposed to the laser become conductive and discharge the negative charge on the surface to the
metal cylinder of the drum. These discharged areas are what form the electrostatic image.
Figure 5-4 Laser exposure
Development
With the toner cartridge in position, a negative charge is applied to the toner particles. As the
developer sleeve and drum rotate past one another, the toner particles are drawn to the drum’s
surface. Areas of the drum’s surface that are exposed to the laser attract and hold the toner while
the unexposed areas repel the toner.
Figure 5-5 Development
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