I've got a Precision Tig 185 that decided to give me the first major problem since I've owned it ~15 years or so. I got all set up to weld, unit turns on fine, fan and gas purge cycle complete. I tap on the amptrol to verify I've got pre-gas and I've got nothing. Pedal to the floor, nothing. Crap. Unplug, replug everything, same problem. Toggle all the settings I can on the front, still no luck when set back to tig DC-. I check the amptrol at the small microswitch inside the foot pedal, it has continuity when the switch is closed so I think that is ok. I check also at the end of the amptrol cord where it plugs in and it also has continuity when I hit the switch. I tried to bypass the two wires at the plug on the machine front, D and E to see if it would trip the pre-gas switch and it wouldn't do it. Opened the top, unplugged the amptrol connector from the board and tried tripping D and E from the board and still nothing.
Anyone familiar with diagnosing these? Am I missing something I should try? I'm really not wanting to have to buy a new board for this thing unless I absolutely must, they are freaking expensive! Maybe there are some electrical shops guys use to have the boards diagnosed and repaired you can recommend?