My Sealey welder has a similar PCB to yours, it has a small transformer built into the board that supplies the power to the board & maybe the wire feed motor. It is also connected to the welding transformer & somehow it uses the power setting to adjust the wire feed speed so that you don't have to change the wire speed setting when you change the power setting.
Anyway, that small transformer on mine burned out & the wire feed stopped working. I didn't have a small enough replacement one so I used a 24v power supply that plugs into the wall (same style as a phone charger) and removed the pins for the socket, soldered in some wires for the 240v & 24v and remote mounted it on the chassis. I removed the blown transformer from the PCB & soldered in the wires from the power supply.
Not saying that it is what's causing you problems but it could be worth looking at.
i think that the wire feed problem exist in these welders because they don´t have a separate 24vdc psu so when you change the tap of the main transformer the vdc to the motor goes down 18 volts at lower power and less resistence from the pod if i put it on max tap it gives me 24,5 vdc and when i put the welder on load(welding) the vdc will not be constant. but i have to check
so a separate psu 24vdc will be the fix i need only to figure out were i will get the 230vac from that is in sync with the main transformer.
i already turn the pc 180º and i´m sorting out the tracks . i can get the transformer code and i don´t how many legs has the transformer. the pdf has this schem can anyone tell me how to conect another 24vdc only for the wire feeder motor