43967002TH Rev.1
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Oki Data CONFIDENTIAL
2. Theory of Operation
Overview of the color registration error correction method
The color registration error correction is executed by reading out the registration error
correction pattern that is printed on the belt, by using the sensor that is located inside the
sensor shutter in the bottom of the belt unit. This sensor is used to detect the registration
error pattern and implements the color registration error correction.
Automatic startup timing of the color registration error correction
• When the MFP power is turned ON.
• When the cover is closed after the cover is opened once for a short time.
• When printing of more than 400 sheets is executed after the previous color
registration error correction.
The correction error can occur depending on the amount of toner of the generated pattern, or
due to the dirty sensor stained by toner, or because of the defective operation of the shutter
open/close operations. However, because the error is not displayed on the operator panel
even when the error occurs, the error display should be checked by implementing the color
registration error correction forcibly by using the self-diagnostic mode (chapter 5.3.2.6).
Right color registration error correction pattern
Left color registration error correction pattern
Color registration error sensor
Color registration error sensor
Belt waste toner box
Belt cleaning blade
Color registration error sensor
Transport belt
Sensor shutter
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