44015503TH Rev. 1
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Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATION
Outline of density correction
The density is corrected by reading the correction pattern that is printed on the belt with the
density sensor located inside the sensor shutter under the belt unit.
Automatic start timing of density correction:
• A
t power-on
• When the ID count after the previous correction exceeds 500
A correction error may be issued due to an inadequate toner amount of the pattern
generated, a sensor stained with toner, deficient opening/closing of the shutter, or for other
reasons.
However, even if an error is issued, it is not indicated on the operator panel. Therefore,
forcible density correction will have to be performed in the self-diagnostic mode (section
5.3.2.7) to check the error indication.
Density correction pattern
Density sensor
Transport belt
Sensor shutter
Belt waste toner box
Belt cleaning blade
Density sensor
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