Electronics > Repair

Welder Tig AC/DC blown house fuses, shorted IGBT

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tmazz:
@Tokenpete Your a legend mate! I do think it's a copy of an Everlast welder as I have seen a picture somewhere of the output section of the control board which was exactly the same!

tokenpete:
 :) You are most welcome

tmazz:
@tokenpete attached is the secondary inverter board schematic for said welder.

tokenpete:
Great work. I have plenty of these boards as new pieces. Mostly the caps die on them after not being in stoarge for a while.

tmazz:
Cheap caps are always a problem.

I would like the AC frequency range to be a bit higher (up to 200hz) so I might lower the value of resistor R2, on secondary board, and then change the pot to a higher value so that I still get the very low frequency range. The balance is a bit ordinary as I don't think it is in spec with the dial. My Tungsten tends to ball up a bit too easy when I push the current up and dial set to minimum, i.e., 30% EP.  I'll scope it out and see what is going on. Being able to adjust a bit lower than 30% EP would be nice anyway.

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