Broken Welder HELP!!

[mossyboy6]

My snapon mw120 is broken.

It was working fine, but then it just stopped working.
The fan turns on, it makes all of the usual noises, feeds, but there is no current.
When the trigger is held down for more than about 5 seconds, it trips the breaker in my garage.

I pulled it open and tested the capacitor and there is no current to the capacitor either.

Anybody have any ideas?

 

[gibbon_guy]

Is there a fuse?

 

[mossyboy6]

not one that I could find.

 

[Rentawrench]

Is your shop "moist" ? My Tig had Air gap points ,I had to regap.

Double check all the contactors,for being stuck or corroded

 

[mossyboy6]

My shop is dry as the desert.

 

[LIVELY]

there should be some kind of fuse[inline maybe]
or are you getting full current to the machine [cracked plug in wire to wall]

 

[rickairmedic]

Well its a Snap on just warranty it .


Rick

 

[mossyboy6]

there should be some kind of fuse[inline maybe]
or are you getting full current to the machine [cracked plug in wire to wall]

Yeah, it actually trips the breaker when i hold down the trigger for more than about 5 seconds.

 

[MGMatt]

Call the tech support number. I think it is 800-abc-weld. It should be on the side of the machine. They have always been helpful when I've had a problem.

 

[gibbon_guy]

Short to ground or it's drawing too many amps. What is the circuit rated for? Try a different outlet?

 

[mossyboy6]

The outlet isnt a problem as the welder is producing no spark.

But I did try it on another plug, no change.

 

[35mastr]

That board is likley your culprit. My co worker has that welder and had the same issue that you are having. The board was toast.

 

[mossyboy6]

oh boy, time to pull out the ol multimeter and go to town i guess

 

[Vicegrip]

Check to see if there is some welding wire wrapped in the feeder or other short. Have you had a bird-nest recently? The entire wire including the spool is energized during welding. If any energized part grounds to the case it will not weld and depending on the machine, kick the breaker or just not start in the first place. Worth checking at least.

 

[Wanna Ride]

I was always told that if the fan comes on, it's not the board.