44346001TH Rev.1
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Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATION
Outline of color registration correction
Color registration is corrected by reading correction patterns, which are printed on the belt,
by use of the color registration sensor located inside the sensor shutter under the belt unit.
The sensor is used to detect patterns and correct color registration.
Automatic start timing of color registration correction
• At power-on
• When an opened cover is closed
• When 400 or more pages have been printed or at least six hours has passed after
the previous correction
A correction error may be issued due to an inadequate toner amount of a pattern generated,
a sensor stained with toner, deficient opening/closing of the shutter, or for other reasons.
However, even if such a registration correction error is issued, it is not indicated on the
operator panel. Therefore, it is necessary to perform forcible color registration correction in
the self-diagnostic mode (Section 5.3.2.6) to check the error indication.
Right color registration correction pattern
Left color registration correction pattern
Density sensor
Color registration sensor
Belt waste toner box
Belt cleaning blade
Color registration sensor
Transport belt
Sensor shutter
