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Testimonial: "My snao-on mw 120 welder stopped feeding wire. i believe it to be the circuit board.need specs on board
Ive verified the power supply is good.board out put is .08 volts"
sometimes the whole wire feed is cheaper than a board,i had the same thing and found out it was made in italy and i had to go there i will try to find ref for it,sometimes the whole wire feed is cheaper than a board,i had the same thing and found out it was made in italy and i had to go there i will try to find ref for it,
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The wire speed knob does more than control the wire speed. As the wire speed is increased the welding power must also increase and the circuitry to do this and keep things in sync is fairly complex. The fault is probably within that circuitry and the repair will require no small amount of skill and test equipment or a replacement circuit board.
Complex electronics can be fairly sensitive to high temperatures and voltage spikes and surges and apart from the natural sort that arrive along the mains electricity supply mig welding is an electrically noisy process that can be quite stressful on those electronics. 20 years of trouble-free operation is quite a good record...
I assume you removed the broken wire and reloaded correctly. So if the power is now reduced I believe the power supply is not running on 220v. This can be from one leg of the breaker being tripped. Check your wiring starting at the main panel circuit breaker, then the receptacle, extension cord, welder circuit overload protector (on back of welder), and then inside at the main transformer. See if you see any burnt wires at the transformer or apparent heat damage on the windings.
The weld wiring burning doesn't meant the transformer is good, it only means you have shorted hot to ground and thats what happens when hot touches ground it heats and melts. I would start by looking for a schematic for you welder. Check and making sure your getting good power to the power supply, relay(s) first. Also you can ohm out the transformer and check for the proper resistance but without the schematic/wiring diagram I can't say what the specs are. Normally on these the power comes in to the switch and then to the relay(s) which send power to the fan, and then splits to the trigger which allows power to the transformer, wire feed motor etc. But without the diagram your just shooting in the dark.
Sounds like the circuit board is a good suspect.
Sometimes a resoldering of compoment leads will fix things.
You can also replace the circuit traces with individual wires
Sounds like you have already done a good trouble shoot, so I hope this info helps you get back in action
This usually happens when the main Power semiconductors fail. You need to check out the two main places, the Power Supply, make sure ALL voltages are correct, and the main Output semiconductors, check these to make sure they are Not open circuit or short circuit.
http://www.millerwelds.com/service/ownersmanuals.php
Above is your support link.
You need to contact Miller and obtain a service manual, before attempting to service this unit.
these need a good power supply , i looked and did not see the duty cycle on this welder
if you are doing heavy welding 100% power it will need 30- 40 minutes to cool of to weld again. it all depends on the units duty cycle, stated on the welder spec plate ..can you bypass the auto feed speed mode ? this might be the issue.. good luck ..use all the protection you can when welding these are like the sun and can and will burn exposed skin and eyes .. if'n i was any help throw me a bone and vote thanks jay
yes its fixable,check the main contactor for proper voltage first,power boards are high dollar,so check the price of new one then decide if you want to put that type of money in the unit.
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