First to answer your question. If the Drum is low mileage you may get away with just replacing the dev, but you must go through the process as if you...
Most of the KonicaMinolta machines don't require you to log in as Administrator to add addresses so if you do your adding without being logged in you...
I don't know if this will help but I had what sounds like the exact same problem on a Di850 not the same but close enough. Dev , Drum Charge full Pm...