Tried 3 working mics, no audio at all, AM or SSB. I hear a slight sound from the speaker. External speaker no sound either.
TX is perfect, and I can see I am receiving by the meter swing, I've just got no sound. I suspect an audio chip went bad>
Part number is TA7222P 10 pin in line chip with radio faceing you part side up look on right side of chassie tward the back it's mounted on the board but fastened to the chassie use heat sink compound on new one when replaceing it and that's only if your SEAKER checks out okay!
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Make sure your boots are switched off and run the radio off a good car battery before you start looking for problems inside the radio. This problem may clear or change characteristics when the supply is changed.
That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike.