speedbump...love the name...i'd say almost as good as flashbulb..:-)...I am an electronic technician(communications) Built my own home and shop, jack of all master of ????. Garage door is dead. checked ac power to the unit good. need operating proceedures especially for trouble shooting. I don't have a schematic of the unit, but I believe that if I had one I could tackle the old girl! this is my first time in the forum and I must say a "duck out of water".