General and Operation Overview
Xerox Internal Use Only Phaser 7100 Service Manual 1-55
Imaging Unit (Electric Charge/ Cleaning)
The Imaging Units form electrostatic latent images and toner images. One is allocated to each color
(Yellow, Magenta, Cyan, and Black). The Imaging Units are made up of the following main
components:
•Drum - Forms electrostatic latent images and toner images.
• Bias Charge Roller (BCR) - Charges the Drum.
• Cleaning Blade - Cleans any toner remaining on the Drum after transfer of toner image onto the
paper.
• Erase Lens - Uses the Erase Lamp to discharge the electric charge on the Drum surface.
• CRUM - A non-volatile memory that stores consumable data.
• (K) Imaging Unit Waste Toner Container - Stores the waste toner that had been collected from
the Drum during the cleaning process. The Waste Toner Container for black also collects the
depleted toner for all other colors.
• Erase PWB - The Erase Lamp is used to discharge the Drum surface. One is allocated to each color
(Yellow, Magenta, Cyan, and Black).
s7100-171
Imaging Units (Y, M, C, K)
Drum
BCR
Cleaning Blade
Erase Lens
CRUM
(K) Imaging Unit
Waste Toner Container
Erase PWB