Dear Bob M., Excellent, thank you. I will further explore the block diagrams and schematics with this in mind. I appreciate your insight. I also found that the pins of U52 on the A14 board appear to be covered with corrosion due to a (perhaps) spill of something which leaked onto the board. The leak...

Dear all, New member here - I mostly use an IFR 500A and an IFR 1200S for Ham repair and repeater work, but I just acquired an R2014D which on the exterior appears to have lived a rough life but looks pretty clean on the interior. It has one major issue which I need to clear up before I can move on ...