Gesan sincro ew 200 ac the welder part wont work properly the generator seems fine what could be at fault?

Answer 1

there is probably a blown diode in the rotor windings. unsolder the diode make sure to remember the direction it was fitted it is fitted with a capacitor in parralel with it remove both diodes check them with a diode test on a multi meter and repalce the blown one.if you refit the doide the wrong way then it wont work and you would have to remove it and re fit it again.

Does anyone knows the value of the diode or part number?

answer; no but if you live in Ireland or the UK go to a maplin electronics shop they sell assorted bags of diodes for a couple of quid just use a similar sized one or bigger. smaller ones are likely to burn out.if its stronger it wont effect it.you can also order these online on the maplin website