Page: 29Service Guide OL400Chapter 2 Principles of Operation2.4.03 Process DescriptionsHopping and FeedingHopping 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 resistmotor in the counter-clockwise direction drives the feed rollers.HoppingHopping 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 itcontacts the feed roller (a predetermined length).FeedingFeeding is transporting the paper through the printerAfter the end of hopping, the resist motor reverses and the resist rollers transport the paperthrough the printer.Charging-6 Kvdc is applied to the charge wire. This causes negative ions to be generated in the vicinity ofthe charge wire (corona discharge). The negative ions are discharged to the grid plate and theimage 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 chargedwith more than -700 vdc, a varistor is connected between the grid and ground. If the grid voltage
