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Service Guide OL400
Chapter 2 Principles of Operation
2.4.03 Process Descriptions
Hopping and Feeding
Hopping and feeding are accomplished by the resist motor, hopping roller, and resist rollers.
Turning the resist motor in the clockwise direction drives the hopping roller. Turning the resist
motor in the counter-clockwise direction drives the feed rollers.
Hopping
Hopping is loading paper from the tray.
The resist motor turns the hopping roller to advance the paper until the inlet sensor turns on.
After the paper has turned on the inlet sensor, the hopping roller advances the paper until it
contacts the feed roller (a predetermined length).
Feeding
Feeding is transporting the paper through the printer
After the end of hopping, the resist motor reverses and the resist rollers transport the paper
through the printer.
Charging
-6 Kvdc is applied to the charge wire. This causes negative ions to be generated in the vicinity of
the charge wire (corona discharge). The negative ions are discharged to the grid plate and the
image drum surface. Since the drum surface is not conductive (in the dark), the negative charge
(approximately -700 vdc) remains on the drum. To ensure that the drum surface is not charged
with more than -700 vdc, a varistor is connected between the grid and ground. If the grid voltage