Garmin SL-40 Comm Problem
Three flights ago I started noticing a popping sound in my headset - small popping sound just once in a while. Two flights ago the sound became more frequent and the received voice was getting harder to distinguish. Yesterday?s one-hour flight relinquished the radio pretty much useless. What I noticed was the Tx light on the radio face panel was flickering in conjunction with the popping sounds. I tried troubleshooting in the air as best I could; un-connecting / reconnecting headset plugs, isolate intercom, shut off intercom, test both PTT switches, etc. By chance I pushed on the face of the radio and the comm became solid again. Release pressure and popping again. So, once on the ground I pulled the radio and used electrical contact cleaner and then electrical silicone liquid lubricant on both the connector on the back of the radio and also the mating connector in the radio tray. Still have problem...
I took the faceplate off the radio, removed ribbon connector, removed three screws holding faceplate circuit board and reassembled unit. I won?t be able to try radio until tomorrow.
Any thoughts on how to troubleshoot or suggested avionics repair shop?
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
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MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H