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Oki Data CONFIDENTIAL
44158801TH Rev.2
33 /
Outline of density correction method
The density correction is implemented reading the correction pattern that is printed on the belt
with the sensor located inside the sensor shutter under the belt unit.
Automatic start timing of density correction:
• If the environment at power-on is greatly different from the one in which previous print was
executed.
• If at least one or more of the four ID count values are close to those of a new product at
power-on.
• When the ID count value exceeds 500 counts since previous execution.
A correction error may be issued due to an inadequate toner amount of the pattern gener-
ated, 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 (Subsection 5.3.2.7) to
check the error indication.
Belt motor
Sensor shutter
Density sensor
Belt waste toner box
Belt cleaning blade
Density sensor
Density correction pattern
Transport belt