Thanks for the idea. Cool signature on your e-mail by the way. After writing the above question, I found the Chamberlain (they make the openers), web site which had an 800 number. Sears had no such number. The tech told me my problems was the only remaining possible thing to burn out, the RPM sensor and he gave me the part number. So, I have ordered it from the Sears parts web site. He said I must have burned out all three things that burn out, the circuit board, the sensors and the RPM sensor. We'll see when I hook up the laqst one. Thanks again.