I’d suspect the “T” and “R” voltages and the switch over on the control board.
Check their levels. If they (or one) is between values i.e. +12 on rec is no 
+4, that could screw things up 
Mike, WB8VGE
“The trouble with quotes on the Internet is that you never  know if they are 
genuine”
—Abraham Lincoln
> On Apr 13, 2017, at 10:58 AM, Curt Benjamin via TenTec 
> <tentec@contesting.com> wrote:
> 
> Tom, find out if there’s a signal missing when it quits – i.e. PTO or 
> something. If it affects receive and transmit on all bands, I would say it’s 
> not a pre-mix oscillator for one band,but something common. It also could be 
> a DC voltage missing. I don’t have the manual in front of me to see what it 
> could be – I’ll have to wait until I’m done with work. This seems like it 
> would be a easy fix if you could think it through and take some measurements 
> with the forum’s help if needed. 
> 
> Curt, K8AI
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