Konica Minolta PagePro 1390 MF User Manual page 86

6
Install the imaging cartridge.
7
Close the front cover.
8
Press the Menu key.
9
Press a scroll key until 1.Common Setup appears on the display, and
then press the Select key.
10
Press a scroll key until 14.Reset OPC appears on the display, and then
press the Select key.
The service life counter for the drum cartridge is reset.
74 Replacing the Drum Cartridge