President Lincoln 2+ issue

[Sparky1]

Think I shorted a pin on my mic input jack now my up button on the mic does not work. I'm sure it must be an internal problem but don't have a clue where to start looking. Any ideas ???

[MDYoungblood]

I think you blew out a diode but I would need a schematic to figure out which one. If possible try another mic, this would let you see if it’s that or inside the radio.

3’s

Greg

[Sparky1]

I did try another mic, same issue so it is inside of the radio. Will have to find a schematic for the radio. Thank you...