User Guide

Color-misregistration control
The color-misregistration control corrects the misaligned color planes caused by the variation inherent in
the laser scanner units or cartridges. The color-misregistration control corrects the following:
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Horizontal scanning start position
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Horizontal scanning magnification
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Vertical scanning start position
The DC controller forms a pattern of toner on the surface of the ITB, and measures a misaligned length
with the registration density sensor and the registration density belt-perimeter sensor. Accordingly, the
formatter calibrates the color-misregistration.
Figure 1-29 Color-misregistration control
ITB
Pattern of toner
Regisration density sensor
Registration density
belt-perimeter sensor
The DC controller commands the formatter to perform the color-misregistration control whenever one of
the following occurs:
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The product is turned on or the door is closed, after replacing any one of the cartridges
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The product is turned on or the door is closed, after replacing the ITB unit or the laser scanner unit
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A specified number of pages have been printed
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Continuous printing for a specified period of time
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Cold starting of the fuser when the product is turned on
If data from the registration density or registration density belt-perimeter sensor is out of a specified
range during the cartridge-presence detection or when starting the color-misregistration control, the DC
controller determines an abnormal sensor and notifies the formatter.
42 Chapter 1 Theory of operation ENWW