Good morning .... today probe the machine .... the high frequency is still not removed in AC and in DC it does not do anything, the K33 switch did not make good contact ... when it solves the problem., In position TIG the machine works like MMA (it does not sizzle ... it works well, it goes up and down the current) but in MMA it has a small arc and it does not regulate ...
ahh .... the relay of the control board is always active
is to go crazy
When I try to weld AC or DC, does not matter. There is no current at all, can't melt the material, but the arc lights up. It's like using the lowest amp setting on thick material.
I have removed all thyristors since reading these forum threads, I have checked them all (a colleague helped me). One of the thyristors (bolt type) showed some strange numbers.
Before doing this, I checked the control board and some other parts like capacitor etc.