Imaging units have a limited life span and sounds like yours is getting to the end of it. Sooner or later the printer will stop and demand image unit replacement.
SOURCE: Konica Minolta C450- error code c-2251
It's been a while since you posted that but you may just need to slide it back out and shake it back and forth (long ways) a few times. We had the same problem and the konica minolta tech told us to do that. It worked. DO NOT turn it upside down though.
SOURCE: Bizhub C450
sounds like the wrong image unit. Oce and ollivetti have the same machine and take the same image unit but with a different chip. Make sure it is a genuine konica minolta image unit. If need be try putting the chip from the old unit on the new one and see if lays down the colour
SOURCE: Technical Black Imaging Unit Replaced,Error message still shows
These units are automatically reset with a fuse. When you put the imaging unit in it will completes a connection which resets the count then simultaniously blows the fuse. Sometimes the fuse blows before the reset, which is what it sounds like happened here. The machine should print normally but the error will persist until the unit is replaced with a new one. Is the the imaging unit an OEM unit or remanufactured? Whoever you got the unit from should replace it as defective free of charge. If it is OEM you might have to go through Xerox to get it replaced. I don't know if the Big Box stores will.
SOURCE: Imaging Unit Problem with bizhub C450
On the end of the image unit you will find a white bit of plastic with a small screw in the middle, make sure this screw is tight and then reinstall the units(give the units a bit of a shake too)
SOURCE: How do I reset the Unit Life after replacing black imaging unit?
Just reset the chip. More details you can find here: http://www.chipreset.eu
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