... no really. It's a bit over 20 years since i played with these and i think i've got a dead one. Been trying to get a friends welder working again, it suffering from "always on" syndrome, the moment the power is turned on (without pulling the trigger) two relays close (one for the gas valve, one for wire feed).
When i take the triac out of the circuit, it stops, the relays stay open, etc. So using this in depth diagnosis i'm guessing the unit has gone dead short and needs replacing, but what do i need to get?
Can anybody work out what type/rating this triac/rectifier/mosfet unit is?
https://www.dropbox.com/s/0oxima1e6bwtlua/_20140609_182445.JPG
Thanks.
When i take the triac out of the circuit, it stops, the relays stay open, etc. So using this in depth diagnosis i'm guessing the unit has gone dead short and needs replacing, but what do i need to get?
Can anybody work out what type/rating this triac/rectifier/mosfet unit is?
https://www.dropbox.com/s/0oxima1e6bwtlua/_20140609_182445.JPG
Thanks.
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