Olivetti d-color MF1600 Service Manual page 28

Outline of Density Correction Method
Density correction is made by identifying the correction pattern printed on the belt using the
sensor installed in the sensor shutter under the belt unit.
Timing of automatic activation of density correction
• When the circumstance is significantly different from the previous work performance at
the time when the power is to be switched on.
• When at least one of the 4 ID count values is almost new at the time when the power is
to be switched on.
• When the ID count value is over 500 after the previous work performance.
Correction error can be caused by the amount of toner which generates the pattern, toner stain
on the sensor, malfunction of shutter opening and closing. However, as an error may not be
displayed on the operation panel, it may be necessary to confirm the error display by forcible
execution of the density correction test function (2. 4. 1. 5. 3) using the maintenance utility.
Error Confirmation Method and Countermeasure
Errors should be confirmed by using the density correction test function of the maintenance
utility (2.4.1.5.4).
Belt motor
28
Sensor shutter
Density sensor
Density correction pattern
Service Manual
Belt waste toner box
Belt cleaning blade
Transport belt
Y108500-4