My FT-736R suddenly lost audio output (only the scanning beep OK). I checked the AF unit Q06 upc2002 pin 5 have only 2V. Looks like the IC failed and shorted out the 1Ω,1/4W resistor (fuse), 13.8V at the supply side. Then I replaced the 1Ω, the sound come back. Well, I am a little bit lucky this time, not the upc2002, otherwise need to do more soldering work.