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 1-26Toner 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

●Horizontal scanning magnification

●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.

36 Chapter 1 Theory of operation

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