Electrostatic Charging; Figure 5-4 Electrostatic Charging Of The Photoconductive Belt - Tektronix PHASER 560 Service Manual

Electrostatic charging

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The electrostatic potential of the belt is not uniform following pre-exposure. As
the belt rotates, it passes a scorotron charger which bombards the belt with
negative charges. The scorotron charger behaves somewhat like a vacuum tube.
The grid of the charger, held at a potential of between -500 volts to -540 volts and
coupled with the varying voltage potential on any discrete point on the belt's
surface, determine how many electrons can flow from the corona wire onto that
point of the belt's surface. The corona wire is charged to -6 kilovolts with a
constant current of 400 µ A. The varying electron output from the scorotron,
directly based on the varying charge of the belt surface, results in a uniform
negative potential on the belt surface of -500 volts or -540 volts, depending on
the selected dot-per-inch printing and ambient temperature.
The scorotron
charger lays down
a uniform negative
charge on the belt
surface.

Figure 5-4 Electrostatic charging of the photoconductive belt

manuals search engine
Grid -500
Scorotron
charger
- 6kv
Theory of Operation
-540v
9697-31
Service Manual
5
5-7