TM 5-6675-324-14
The preconditioning corona removes all residual positive charges from the surface of
the rotating drum, leaving a uniform negative charge. This assures even copy densi-
ty . The drum is also exposed to the halogen lamp. This restores the resistivity
of the CdS layer to the correct operating range.
(2) Primary corona.
The primary corona applies a uniform positive potential to the drum surface as it
passes. Electrons are drawn from the aluminum base through the CdS layer to the
underside of the insulating film to balance the positive charges.
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