Konica Minolta magicolor 1690MF - Manual (Page 179)

Replacing Consumables 7-16
Note
Do not touch the wires and flat
cable shown in the illustration.
"
The machine must complete a calibration cycle after the imaging
cartridge has been replaced. If you open the scanner unit or front
cover before the machine is reset, the calibration stops, then starts
over again after the cover is closed.