Xerox Phaser 7300B, Руководство по обслуживанию, Страница: 237 / 277

Theory of Operation 8-221
Summary of the Printing Process
The following steps summarize the xerographic print process for the Phaser 7300
Printer.
1. Paper Pick and Transport - For the entire paper path, see page 8 - 226.
2.
Charging - DC voltage applies a negative charge to the charge roller and the
surface of the imaging unit drum.
3.
Exposure - The LED head emits light to the negatively charged surface of the
drum. Areas of the drum surface receiving the light attenuate the negative charge
based on light intensity and surface potentials, forming the latent electrostatic
image on the drum surface.
4.
Developing and recovery of excessive toner - Toner is attracted to the
electrostatic image on the drum (the areas exposed by the LED light), forming a
visible image on the drum surface. Excessive toner is simultaneously transferred
from the drum surface to the development roller.
5.
Transfer - The transfer roller applies a positive charge to the back side of the
paper. The toner image on the imaging unit drum is attracted to the positive charge
and adheres to the paper.
6. Cleaning - A cleaning blade, located on the transfer unit, scrapes off excess toner
left on the imaging unit after transfer.
7. Fusing - The fuser permanently fixes the toner image to the paper using a
combination of heat and pressure.