[TenTec] Symptoms of logic board failure

[Steve Halliburton]

 > I have seen lots of postings about "logic board failures" but haven't 
seen any listing of the symptoms (specific problems) that
 > caused the owners to send their rigs in for repair. Is there any 
common problem?

My VI/3 logic board seemed to have "failed" about two years ago.  The 
radio was pretty much completely
dead as far as controls and displays go, although it still made noise.  
I was able to trace the failure
to the on-board OCXO.  After a great deal of fiddling I got the 
oscillator running again, bringing the radio
back from the grave.  Frequency stability was not so great after that, 
so I replaced the entire oscillator with
a new TCXO.  The result is that the radio is now much more stable with 
almost no required warm-up time
and has worked perfectly since.

I have no idea how common this particular failure is, but at least 
here's one data point for your collection.  The
good news is that it was (after I found the problem) an easy fix and 
there were dozens of choices for the
required parts.

73, Steve, WA2SOC