Migstar 250 1 yr old used little, the other day when pulling trigget no solenoid for gas or wire feed in continuoud and spot mode, only gas in stitch mode.

Upper left is spot welding timer. Upper right is for stitch welding. Here is a short video.MIG STAR 250 MONO

First, verify that the stitch length is set high enough that the feed dogs should be pulling the fabric to create a stitch.

If you have not recently oiled the machine, the feed dog mechanism may be stuck due to old oil that has solidified. Pick up some liquid Tri-Flow Synthetic Lube. While gently rocking the handwheel, apply a couple drops everywhere that metal rubs against metal. Do NOT oil rubber, leather, or synthetic parts!!! Don't forget to hit the spots under the sewing surface, ie the feed dogs, bobbin area, etc. Also, move the levers and selectors and hit those with a couple drops of oil. If things are still a bit sluggish, you can apply hot air from a handheld hairdryer at the interior of the machine. The heat will help loosen things.

P.S.--I picked up a frozen Pfaff 260 at the thrift store for $25. Used the above method to get things loose and now it sews beautifully!!!

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There is a solenoid on the bottom of the carb with a wire on it, when you turn the key on it sends current to the solenoid and it pulls a rubber plug away from the main jet feed and lets it get gas so it can run.When the key is turned off it plugs the gas feed so it doesn't backfire from gas hitting the red hot carbon on the piston. This caused a lot of broken rods. The solenoids are expensive and a lot of people cut off the tip so it doesn't plug the feed if it quits working .

With the ignition on, short across the starter solenoid and see if anything happens. If it tries to start (or fires up) then the problem lies with the feed to it so I would suggest re-instating a working push button and wires.

Although paper jams occur because of dirty pickup rollers I have found that jams occur frequently because of solenoids in the paper feed mechanism (the assembly that the paper trays fit into). There are two of them and over time the damping foam on the levers get sticky causing the lever to operate late which causes the jam. As a fix I remove the damping foam and put insulation tape on the lever making sure the solenoid works by using a 12v bench psu before reassembling. You will need service manual because Paper Feed mechanism removal is a little complex.

Paper feed problems in Canon Laser Jet Printers are caused by these solenoids mainly in Duplex mode. P3005dn's etc.
Hope this helps solve yr problem.

try to use bare .032 wire and co2 shielded gas, If the equipment does not have a gas solenoid you may have to wire a solenoid to the trigger mechanism to get the gas to flow while the wire is feeding. The bare wire usually copper coated burns much hotter than the flux core when there is a gas shield. Also a .032 bare wire with a gas shield burns a a lower amp range and will get better penetration.

You may have to experiment with the feed rate and gas flow to get the correct setting, but the bare wire has a lot less resistance to current flow than the flux core and will burn a lot hotter when you use a gas shield.

At 115 vac there is not a lot of amperage left to create an arc and run the feeder and the rest of the unit , and the flux core wire takes a lot of amperage to burn both the wire and the flux . .

check for circuit breaker by drive motor, it may be the pc board.

Hi:

If you see rust on the wire then you should stop and change the gun's liner, change the contact tip and clean the feed rolls. Rust can accumulate inside the gun and make the wire feeding a problem.

Lots of MIG/MAG units have a Stich and spot facility, these are indicated by Stitch -------- and spot by .......with a timer control numbered 1-10sec make sure that both are switch to off, anti clockwise, These switches are a bit fragile so be a little carefull with them.
Lets know how you get on,,
KEN

1. Wire jammed
2. Out of wire
3. Not enough tension
4. Wire liner worn
5. Wire disconnected internally
6. Contact tip clogged