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dadgum
08-25-2014, 06:47 PM
I just bought a used Hobart 135 with a small tank, regulator and a cart. It worked, or appeared to be in working order; fan came on, heard the solenoid open and close with the trigger and wire would feed. I handed over the cash and brought it home. I tried to weld with it and the wire feed control wasn't working. Always full throttle. I found a thread about the control board problems, however there were no signs of overheated components on the printed circuit board. I ordered the Darlington pair transistor (Q1) from Digi-Key ( 2N6388 NPN ) and replaced the suspected component. Now I am ready to start learning to MIG weld. The number of projects have been lining up for years!