OBERHEIM DX dont run

My Oberheim DX was not in use for 30 Years. Now it won’t start (metronome don’t tick ) if I hit record and play. I tried to fix it in the “edit” menue, but though the led of the edit control lits I cannot get into the edit structure. Does anyone has an idea ??? (all drum sounds play manualy, all knobs work, except the “edit” )