Okay I'll give it a shot.Originally Posted by performance
I was able to find my old email from a couple years ago where I had basically the same problem. Replacing the 4053 and adding the diodes and cap fixed it up until today. So I'm pretty hopeful that will fix it this time. The new 4053's are in the mail and I'll report back once I try them out.
Heres my old email:
"On 3/5/2012 12:32 AM:
Hello,
I had a serious problem with my PowerPro 256 today which makes it unusable. I have had the unit for about a year and a half.
This is not the first time I have used the welder. I have done maybe 120 minutes of welding with it (thats actual current ON time).
I was in DC TIG mode with pulse off, and using the foot pedal, doing simple welding on mild steel with a thin tungsten electrode (close to 1/16" diameter). I had just done a successful weld a few minutes before, and was starting a new weld. Suddenly a huge hole blew in the steel I was welding. I didnt know what had happened. I looked at the electrode and it was gone, it had vaporized about half an inch of the electrode. I looked at the welder and it said 130 amps. I figured somehow I must have set the current too high (I am pretty sure 130 amps would vaporize my electrode). I set the main knob back to 90 amps and tried again. A huge hole blew in the steel again and I let off the current quickly to avoid vaporizing the electrode again. The display on the welder now said 213 amps! A couple seconds later it went back to 90 (the usual delay).
I spent 10 minutes playing with all the knobs, switches, restarting the unit, etc.. but it would always say more than 200 amps once I pressed the footswitch. CUT mode shows between 245 to 257 amps regardless on knob position for amps.
I disconnected the foot switch and tried using the torch button in DC TIG mode again. The display would bounce around and sometimes say -1 or 0666.
"
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