dogsknob
Member
Further to the above, I had a good one today. It was a Panasonic 31 with no low band signals. Turned out to be the 13/18v switched regulator on the PSU board. When I scoped the LNB supply it had an almost perfect 190 Hz sawtooth of about .8v p-p sat on top of the DC. Looks like this had confused the LNB into thinking that there was always a 22khz signal, hence no low band.I believe that this problem is repairable so I'll be making some effort to find out whats causing it when I get the chance, hopefully in the next couple of weeks. I'll keep you posted.
I wonder if this is similar to the "spurious 22khz" that the filter is meant to cure.
Any comments ?