Cleaning (Drum/ Bcr) - Xerox Phaser 7500 Service Manual

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Table of Contents

Theory of Operation

Cleaning (Drum/ BCR)

Excess toner on the Drum surface and the BCR is removed, and the potential on

the Drum surface is discharged.

Discharging the Drum - A Drum that has gone through the "Primary Transfer"

process is discharged by exposure of light from the Erase Lamp.

Cleaning a Drum - Toner that was not transferred to the belt during the

"Primary Transfer" process remains on the Drum surface. Because this toner

will interfere with the subsequent processes if allowed to remain on the Drum

surface, the Cleaning Blade that is in contact with the Drum scrapes off the

remaining toner, which is then transported by the Drum Waste Toner Collector

into the Waste Toner Bottle.

Cleaning the BCR - The Cleaning Roll, which is made from spongy material,

contacts the BCR surface to remove the remaining External Additive (the

whitish transparent powder on the toner surface) and returns it to the Drum.

The External Additive that was returned to the Drum, along with any

remaining toner on the Drum, will be scraped off and removed by the

Cleaning Blade during the Drum Cleaning process.

Positive Electric Charge

Negative Electric Charge

Toner External Additive

Erase Lamp (LED)

Cleaning Blade

Photoconductor

Cleaning Roll

Phaser 7500 Printer Service Manual