On Wednesday, November 1, 2017 at 7:43:56 AM UTC-7, OHM Ω http://aviation.derosaweb.net wrote:
I get one question a lot, to wit, "My radio isn't working! WHAT DO I DO NOW????"

So I put together a simple "things to look for" guide to troubleshooting your transceiver woes.

Find it here http://aviation.derosaweb.net/presentations/

Let me know if you have things that could enhance this document.

Thanks, John Ω

Most electrical problems can be traced to a connector (which may be inside the radio), followed by cabling problems. This becomes exaggerated with age.. I very recently found a solar panel problem that was a broken connector pin). Get a can of electrical contact cleaner and magnifying glass. Look at EVERY soldered connection very carefully (a broken wire going to that solder joint can look very much like it is connected).
The next thing to go are capacitors; the electrolyte in polarized capacitors dries up and they lose their capacitance. This goes especially for aluminum electrolytics (the can shaped ones). Fixing that, however, takes more soldering skills than you may have.

Tom