Xerox Phaser 6000 Service Manual

2-66 Xerox Internal Use Only Phaser 6000/6010 and WC 6015 MFP
Theory of Operation
Color Registration Control
The printer uses a tandem system where the drums and developers are arranged
respectively for Yellow, Magenta, Cyan, and Black colors. Since the four color-
separated images are overlaid onto the print medium, a color shift may occur. The
color registration control calculates how much the registration is shifted, and
adjusts the LPH write timing.
The lateral registration control adjusts all of the four colors in lateral directions.
The color registration control is executed during a process control based on the
change in the internal temperature and the print count.
The control is outlined below:
1. With no toner on the transfer belt, the output value of the ADC Sensor is
measured to determine the threshold value.
2. The patch for color registration control is generated on the transfer belt. This
patch is composed of four cycles of a color pattern, each containing 10 mm
wide color bars starting with a Black trigger line followed by K, C, K, M, K, and Y
(in this order).
3. The density of the patch is measured by the ADC Sensor.
4. The shift correction amount is calculated from the threshold value determined
in 1) and the patch density measured in 3).
5. The LPH write timing is changed according to the shift correction amount.
10 mm
About One Half
Turn Of Belt
Color Registration Control
K
K
C
K
M
K
Y

Xerox Phaser 6000 Specifications

General

Brand	Xerox
Model	Phaser 6000
Category	Printer
Language	English