General and Operation Overview
Phaser 7100 Service Manual Xerox Internal Use Only1-88
Color Registration Control
The Phaser 7100 is a full color printer that uses the tandem system, where each color (Yellow, Magenta,
Cyan, and Black) has its own Drum and Developer Housing Assembly. Because each color forms an
image on their own Drum, which are then overlaid to create one image, color shift may occur due to
Drum misalignments, skewed installation positions, etc. The function to correct this is the Color
Registration Control or “Regi Con.”
The Color Registration Control includes the Lead Registration Correction in the process direction (Slow
Scan direction) and the Side Registration Correction and R/E Ration Correction in the lateral direction
(Fast Scan direction). The correction in the process direction is performed at the IOT while the
correction in the lateral direction is performed at the Controller.
Note: The vertical direction (Slow Scan direction) is a direction perpendicular to the Drum axis and
it is the direction in which the paper is transported. The horizontal direction (Fast Scan direction) is
a direction parallel with the Drum axis and it is the ROS Scan direction.
These controls are performed based on the values that were detected by the two Left/ Right CTD
Sensors and the Temperature Sensor that are part of the CTD Sensor Assembly. Furthermore,
these are the control types - the Closed Loop Regi Con and the Open Loop Regi Con.
Closed Loop Regi Con
Although this control is different from the correction in the process direction and the correction in the
lateral direction, the content of the control is almost identical.
Execution Condition
• After replacing the Imaging Unit and/ or the IBT Unit (Intermediate Transfer Belt).
• When turning On the power or returning from the Sleep Mode and the change in the printer's
internal temperature has reached the specific value or higher since it was last executed.
• Before a Job in Full Color Mode (process direction) and the change in the printer's internal
temperature has reached the specific value or higher since it was last executed.
Control Flow
Patches are created at 2 locations (left side and right side) on the Intermediate Transfer Belt. The
patch is made up of 4 single color - Yellow, Magenta, Cyan, and Black, identical shapes that are
arranged in a line. The patches are read by the Left and Right CTD Sensors, the value of which are used
to measure the skew with the reference color and other color.
Correction Amount Calculation
• Vertical Direction: Lead Registration Correction Amount - the correction amount is calculated
from the average of the position misalignment at the left side and the right side.
• Horizontal Direction: Side Registration Correction Amount - the correction amount is calculated
from the position misalignment at the left side.
• R/E Ratio Correction Amount - the correction amount is calculated from the difference of the
position misalignment at the left side and the right side.
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