Hi, I was wondering if I could get some help with a new to me Airco welder? It was given to me by a friend who picked it up at an auction for free. I recently wired it up and attempted to tig weld a bead. I soon figured out that the current setting potentiometer had no effect on the current applied for each of the low, medium, and high current ranges all were running at max.
So, I did some research and found out that the circuit board is most likely the problem. I then removed the side panel and unbolted the aluminum base with the circuit board. I noticed that one component appeared to be missing the portion above the circuit board.
If any one has a part number and or any information it would be greatly appreciated.
Thanks in advance and have a great day. Nelson
Here is a picture of the board: