During calibration, the product places a specific pattern of toner on the surface of the ITB. Sensors at
the end of the ITB read the toner pattern to determine if adjustments are necessary.
Figure 5-26 Toner patterns for calibration
Color-misregistration control
Internal variations in the laser/scanners can cause the toner images to become misaligned. The color-
misregistration control corrects the following problems:
●
Horizontal scanning start position
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Horizontal scanning magnification
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Vertical scanning start position
The calibration occurs when any of the following occurs:
●
A cartridge is replaced
●
The temperature of the sub thermistor is 50 C (122 F) or lower when the product recovers from
sleep mode after a specific number of pages print.
●
A specified number of pages have printed.
●
The formatter sends a command.
●
The user requests a calibration by using the control-panel menus.
If data from the color-misregistration and image-density sensors is outside a specified range when the
product is turned on or when it is beginning the calibration sequence, the DC controller determines that
these sensors have failed, and it notifies the formatter.
134 Chapter 5 Theory of operation ENWW
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