Hi,
Nope never run across that one before..
Has this radio been modified to remove Talkback?
If so I would check the mod.
If not, I would Check the 470uf inductors mounted on the Mic jack board, see if they are burnt.
Other than that, Check for voltage on the Mic jack pins, and verify all grounds are intact in the mic circuit.
I will investigate for further causes.
Roger
</p>
Nope never run across that one before..
Has this radio been modified to remove Talkback?
If so I would check the mod.
If not, I would Check the 470uf inductors mounted on the Mic jack board, see if they are burnt.
Other than that, Check for voltage on the Mic jack pins, and verify all grounds are intact in the mic circuit.
I will investigate for further causes.
Roger
</p>