Control; Process Control - Xerox Phaser 6000 Service Manual

Theory of Operation

Control

Process Control

Potential Control
2-64
The parameters related to image formation must be corrected to stabilize printing.
The control of the entire printing process including the parameter correction
control is called process control.
The process control is performed by the following two methods after every
30 cumulative prints upon termination of a print run or during a continuous run:
• Potential Control
• Toner Density Control
To supplement these two controls, the following controls are provided:
• High Area Coverage Mode
• Admix Mode
To stabilize the print image density, the drum charging voltage, the developing DC
voltage, and the LED light amount of the LPH are adjusted according to the ever-
changing developing capability of each color developer. The adjusted drum
charging voltage, the developing DC voltage, and the LED light amount of the LPH
are fed back to keep the print image density constant.
The outline of control is as follows:
1. The temperature and humidity sensor detects the temperature and humidity.
2. The patches of respective colors (Yellow, Magenta, Cyan, and Black) for the
potential control are generated and transferred onto the Belt.
3. The ADC Sensor (density sensor) detects the density of the patches on the
belt.
4. The drum charging voltage, the developing DC voltage, and the LED light
amount of the LPH are adjusted for each color according to the detected
patch density.
Xerox Internal Use Only Phaser 6000/6010 and WC 6015 MFP