Xerox VersaLink B7025 Service Manual page 1299

Drum Cartridge (Clean)
As the photoreceptor drum and BCR rotate their surfaces are cleaned by the cleaning augers.
The auger strips used toner from the photoreceptor drum and BCR following transfer and
transports the used toner to a port at the rear of the drum cartridge for reuse.
A shutter adjacent to the used toner port retracts when the cartridge is installed. It is here that
fresh toner enters the cartridge. Refer to
Photoreceptor drum
cleaning auger (hidden)
Figure 17 Photoreceptor drum and BCR cleaning
Launch Issue
Xerox® VersaLink® B7025/B7030/B7035 Multifunction Printer
Figure 17 and Figure 18.
BCR cleaning auger
Shutter
Figure 18 Used toner port and shutter
Process Control
Overview
Process control maintains image quality by compensating for temperature and humidity
changes and the aging of machine components. In part, this involves controlling the charge
potential of the BCR and the light output from the LPH. Image quality deterioration also occurs
as the photoconductive layer on the photoreceptor drum wears with increased use.
Process control uses inputs from the:
• CRUMs
• Humidity and temperature sensors
• Automatic toner control (ATC) sensor
The humidity and temperature sensors mounted on the ESS PWB,
environmental conditions inside the machine.
The ATC sensor (mounted to the drum cartridge,
tration inside the drum cartridge.
Process control uses the information from the above sources to:
• Alter the BCR voltage as required
• Alter the LPH light intensity
• Control the toner dispense rate
April 2017
8-53
Used toner port
PL 3.05 Item 1 monitor the
PL 90.20 Item 1) monitors the toner concen-
Product Technical Overview