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Oki Data CONFIDENTIAL
2. Theory of Operation
that is printed on the belt, by using the sensor that is located inside the sensor shutter in the
bottom of the belt unit.
Automatic startup timing of density error correction
• If the environment is significantly different from that of the previous correction at
power-on.
• When one or more ID count value among the four ID count values shows the status
of nearly the new part at the power on.
• When the ID count value has exceeded 500 counts from the previous 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 density
error correction forcibly by using the self-diagnostic mode (chapter 5.3.2.7).
Error check method and remedial measure against the error
Check the error by using the density error correction test function of the self-diagnostic
function. (chapter 5.3.2.7)
Density error correction pattern
Density sensor
Transport belt
Sensor shutter
Belt waste toner box
Belt cleaning blade
Density sensor
