Try unplugging power from outlet and removing from machine also. Let it go without power for a few minutes then try another outlet. Hopefully it has not had a power surge. It is best to keep unplugged when not in use..
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Try removing thread #3 from the tension altogether. If this doesn't work, then try using a different spool of thread. Some break easier than others. If this doesn't work, try rethreading your serger from the the beginning. Upper looper first, then lower looper, then needle. Test on scraps.
Check to see what pattern is selected. Be sure it isn't the buttonhole.Select straight stitch.Move the stitch length setting to 4.Turn the handwheel and see if the feed dogs move forward. Press the reverse lever and see if they move backwards. Select straight stretch stitch and turn the wheel to see if the feed dogs move forward and backward.Check the presser foot release on top of the machine and make sure there is pressure on the foot. Sometimes the reverse assembly on this machine stops working because it has the wrong type of grease on it and it turns into a hard gummy mess that won't let it work. sewman7
As long as this is a sewing machine and not a serger, I don't know about them. I only tinker on my own. Remove the bottom. There is a rod running along the length of the machine. it needs to be turned 180 degrees. You may need to retime the machine.