What you can also do is shut down your copier remove the toner bottle, turn the copier back on. Let it warm up. either put back in the toner bottle or if your replaceing it with a new one put it inside and you should be fine. If not make sure there is no cranking sounds going on cause usally it's your toner hp motor thats bad..
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Electrical disconnect Draws #2 draw #3 draw #4 and Draw #5 all connections for each of those draws is in the rear middle cover. Also remove the job tray that the device where the paper comes out for faxes print etc. leave only draw one connected power off the machine turn back on after ten seconds. if the code is gone have a bad draw (s) if it comes back replace the main board if you can find one. The Di251 is legacy machine Minolta is now Konicaminolta. If the code did not come back your going to start connecting each draw back one at a time. Fig out which one(s) is causing the problem
Power Supply, High Voltage Power supply or the Master Control Board, machine on a good surge protector if not after getting these part recommended you get one. Did you have a brown out or a black out. or electrical failure, 1st go with the Power Supply since that feed the other two, then the High Voltage then the Master board, all of this is predicated if you can get these boards the Di251 Series is a Legacy Minolta Series now Konica Minolta, good luck try below web site as a start to find parts