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My 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

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Without knowing what welder we can only give you this

Posted on Apr 04, 2015

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"



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A snap on mm250sl that i cant control the wire speed feed, from 4-10 on the dial it runs full speed, from 4 down it does nothing. ive had this welder for 20 plus yrs with no problems till now

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...

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What should i replace?

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.

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My daughter plugged welder into 220 volt outlet. Nothing works: trigger. wire feed motor, cooling fan, gas valve. Bypassed the push button overload-no difference. If I manually depress the magnetic switch...

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.

Jun 21, 2011 | Hobart Handler 140 Mig Welder

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Hi,I have a 225 amp wire feed by powermate, model #117-042. The wire feed motor won't turn over. I took it out and applied 24v, and it works fine. I pull the trigger and can here a clicking sound, like a...

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

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Miller mig welder #175 stopped welding, fan comes on and wire does feed, just no weld.

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.
Above is your support link.
You need to contact Miller and obtain a service manual, before attempting to service this unit.

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1 Answer

My miller matic 35 welds and stops after about 2 inches let cool for about 30 to 40 sec and it welds again. fan runs

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

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I have access to a century mig model 117-3-, 90 amp, 120 volt. the wire feed works and it welds, but it isn't getting 12 volt power to the feed. it might be the circuit board. i know the feed works...

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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Millermatic 200 will not weld

1 - Check the ground connection to the work, including the actual cable to clamp connection.

2 - Make sure that the wire feed rollers are nice and clean. The wire needs to be clean too.

3 - Check that the polarity changing wire connections are nice and tight, clean, etc.

4 - change and or service the contact tip at the end of the gun.

as always, gently clean out the loose junk inside the case. A clean welder is a happy welder. :-)

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I have a miller 180 autoset that does not feed the wire

If your welder is less than 3 years old your local Miller authorized service center will repair it for FREE. They can also check the serial number of your welder over the phone to see if it is still in warranty. For goodness sake DON'T tell them you've been mucking around inside the welder or they won't be able to help you.
That said, if the welder spins the feed wheels without any wire between them it probably isn't the board. There is the switch in the gun, the board, and the motor and brake assembly all needed to feed the wire.

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