Thanks for all the replies on my 5500 rotor problem! I had some time tonite to work on it and here's what I got. On both a1 a3, and e1 e3 pairs I'm reading only 1.0 volts. Between a2 a3 , and e2 e3 pairs I see only .5 volts at half range, IE an elevation of 90 degrees = a reading of .5 volts. I'm going to order a new Q2 UA7806C and this should do it. Only question I have is why Q2 failed to only output 1 volt, don't they usually fail and output 0 volts? I'm thinking it might be something else in the circuit feeding power to Q2. If so I will work this further when I actually take the rotor box apart with the new Q2 in hand. One other thing, I wish I can find all my components' I boxed up when I moved. I bet I have 10 of these in stock :) Thanks again for all the help guys, the electronic copy of the manual was a big help as I can't find my copy....
73 Jeff kb2m > I'm having a problem with my 5500 after a thunderstorm. What is happening > is that the rotor works manually, but doesn't display az and el information > on the control box. Also when I try to use computer control it goes all the > way to stop in both azimuth and elevation. I'm thinking this might be in the > control box, as both az and el are doing the same thing, the control box > being the single point of failure. Did anyone ever have this problem? How > can I diagnosis what chip might be at fault without a schematic. I vaguely > remember having this same problem after a close lightning strike with my > prior az el Yaesu box about 14 years ago but don't remember what chip I > swapped out, or how I determined which one was at fault. This getting old > thing really sucks. Any help would be appreciated. > > 73 Jeff kb2m _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
