Carl from the UK messaged me last night about the President Mc Kinley and whether it had voltage on any of the microphone pins. Then this morning 09.30 an email came in (from another person) asking me what would make smoke come from the microphone socket on a President Mc Kinley. Below is the wiring diagram from the manual of the Mc Kinley and YES it has voltage from Pin6. Amongst other things it drives the Electret and also adds power to Liberty mike.
After the smoke the radio has no transmitted audio
He touched the 6 pin with another and shorted out the plug
Could be a resistor behind the microphone socket
Arranged the radio go for repair and it leaves for repair at cost this morning!
So, no radio catching fire. Was a mistake from the owner which he’s upset about. Radio is as explained now away for repair. The operator was in Germany!
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