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Photoconduction Section
This section eliminates residual charge from the drum surface, uniformly charges the
drum surface, and executes print image exposure.
Discharge
In the electrophotographic system, the portions of the photoconductive,
photoreceptor drum surface where exposed to light become electroconductive, and
toner adheres to these portions, where the charge is neutralized (latent image
formation) so that visible images are formed (developed). However, since residual
charge will exist on the surface of a drum that has undergone the printing process of
charging
precharging, the drum surface potential cannot be kept as uniform as required. To
ensure that the drum surface potential is kept uniform before exposure, residual
charge is neutralized by exposing the drum surface to light from the discharge LEDs
(erase LEDs) in the first printing step.
Residual Charge
2–4
exposure
development
Discharge LEDs
(Erase LEDs)
Figure 2–2. Discharge
transfer charging
separation charging
Photoreceptor Drum
Principles of Operation
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