My IFR 1600S is giving me a couple problems. One is it appears to have some high frequency noise in the received audio, but the generated signal and audio looks and sounds clean. I am thinking maybe some caps in the power supply might be causing this problem.
I have the three inch thick operators manual, but does anyone have a service manual for one of these beasts. I tried to run the calibration from the aux menu but I can not seem to find a password that the operators manual makes reference of. Any help or ideas would be most appreciated. Thanks, Joe - WA7JAW I tried

