K2 s/n 1740 - Control Board Mods or hacks? Part 4 

Have you tried looking at the documentstion for the Rev A to Rev B upgrade kit? Maybe there is a revised schematic there?

I had one from a ham guy off Ebay I was sent wrong radio also had issues I was like do I keep sort when I can or sent back. I did nothing to it just looked at board took a zoom in tested agin no TX RX was a bit deaf. Thinking now I should of just asked for part refund and kept it. Well I may buy a other one.