Mike,
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As Gordon points out, there is most likely a problem with the receiver TR switch.? As with the transmitter switching, verify the operation of Q28.
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You can also try removing the RF from the circuit with a low drive setting.? Set it up as shown on the voltage measurement sheet.
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If Q28 turns on and off with the PTT signal, then look at the diodes themselves.? You should be able to check the diode in the circuit without power.
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It is good you found this before being forced to replace another set of finals and other components.
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73
Evan
AC9TU
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