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Try to open the panel (front) while the power is turned on..look for the tiny hole marked (sometimes) with reset and try to push with a pen to click. Reattached the front panel control and try to check if all the function has gone back.good luck!
Hey sparrow, sorry you didn't get an answer to this sooner, mine just started doing the same thing. After fidling and dismantling for an hour or so I think I have diagnosed it to being the ribbon cable which comes from the circuit board to the front most control panel is cracked (i.e. the cable that connects to the connectors on the removable face plate) When the panel attempts to open fully the ribbon cable is flexed enough to lose connections making the unit think the faceplate has been removed and so attempts to close...when it closes the connectors retouch causing it to think it needs to reopen....this is a nasty design flaw for a unit that cost me $1500 (admitedly 10 years ago but it was in a box in the cupboard for 8 of those years) !!!! Now any chance I can source this $2 part .....eek
I opened the radio and found that the wired ribbon that connect the front display plug to the inside main electronic board was cutted on the place that the ribbon bends when the face plate move in and out to take off the display or put a CD.(It sees like after years opening and closing ribbon makes an edge and break). I called Crutchfield and they brought this phone # for Pioneer replacement parts, Tel. 1-800-228-7221. I called and ordered the part (P/N:XNP7026, FACEPLATE RIBBON CABLE - $24.95) and I installed it, the decks is working perfect! If you have electronic working experience will be easy, if not, buy the part and bring it to an electronic shop. The front connector plug has to be reused. This cable is used on other models like : DEHP6800MP, DEHP7800MP, DEHP780MP, DEHP9800BT, and the DEH980BT. Hope that this help!
Jose Carrasquillo- Puerto Rico
Try holding down BUTTON , then press the RESET button (you'll need a ballpen between the AUTO and SCRL buttons). This worked on the KDC-MP825 (very similar to the MPV8025) when my wife had the same problem this month.
i also have had this unit for over four years. the exact same thing just happened to me yesterday. i was thinking maybe it is the motor that opens the face. has anyone found an exact solution for this problem yet?