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Click the link on the right-hand side of the page below the text box, which reads "Customer Service: Click Here." This will direct you to a contact page.
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Assuming that (a) you have tried installing new needles, (b) the new needles are the correct system for the serger and the right size (typically size 14 for medium-weight fabrics, size 11 for lighter-weight fabrics), (c) the needles are installed correctly (inserted all the way up into the needle bar and facing the proper direction), then your machine is likely out of time and / or has a defective part such as an upper / lower looper. That will require professional attention to correct.
Always thread the lower looper first. Then the upper looper. Finish by threading the needles. By the way, the lower looper is the one which is always below the needle plate and the upper one is the one which travels above the needle plate. sewman7