Could be you have an earth but no live.
The earth of every welder I have had anything to do with has been connected directly to the transformer, though perhaps there might be a case-mounted stud terminal which might suggest the lead doesn't go direct to the transformer.
The "live" output on the other hand, is controlled by either the mechanical contactor or the large thyristers if the welder is of that type.
You need to remove the cover and use a voltmeter to check the output from the transformer and then trace it through the various chokes, junctions and cables.
The welding rod lead has to go into the +ve while the current return which looks like a big alligator clip goes into -ve and is clipped to the metal object you wish to weld.
if you are using mig then check the little black switch under the left zero has been switched to mig.
there is a orange power switch thing on the back of the welder that needs to be checked also .
SOURCE: wont spark or weld
lets go over the basics 1 do you have it set up ,the wire feader turned up at least to see if it sparks 2 do you have itset up at least to see if the amps are on enough to get a spark? try thoughs and see where you are,then turn those up enough to weld with . (make sure your wearing a good helmut .please you only get one pair of eyes!!!!!!!!! )hope this helps jojogunn.
SOURCE: Jasic 250F Mig, OC light on, now no power, only fan going.
Check the internal fuse. If that is okay, check all connections and check for continuity across the heavy windings. Transformer may have burned open at a power tap. Or the heavy contactor burned out.
If you do not have a manual, They do not have any douwnloadable at their website http://www.fsh-welding.com If you do need to contact them, I hope your French is up to snuff-
http://www.fsh-welding.com/contact.htm
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