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Calibration
The product calibrates itself to maintain excellent print quality. Calibration corrects color-misregistration
and color-density variation.
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 1-26 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:
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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:
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A cartridge is replaced
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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.
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A specified number of pages have printed.
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The formatter sends a command.
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The user requests a calibration by using the control-panel menus.
36 Chapter 1 Theory of operation ENWW