[TenTec] Omni D quits after 60-90 minutes

[Stuart Rohre]

This sounds like a problem I had in an instrumentation recorder years 
ago.  Turned out to be a manufacturing quality control slip up. The 
fault took up to an hour to appear.  Finally, while troubleshooting some 
other circuit in the area of what turned out to be the fault cause, I 
saw the fault appear just because we were mechanically working near it.

It was a  heat induced fault on an unsoldered wire to lug connection. 
(A poorly soldered connection could do the same.) Heating made the 
connection move apart from the lug and go open circuit.

Use a high power light and magnifier to examine all the soldered 
connections.  Touch up any that look less than pristine shiny joints 
with good wetting.

You might try to induce the fault by putting pressure sidewise on 
connections near the suspect solder joint.  Since it evidences itself as 
low power, look first at all the power busses and regulators.  Since you 
have symptoms on the receive side, go back and start tracing from the DC 
power supplies.

GL!
Stuart Rohre
K5KVH