Are using embroider table?
Suspect uneven feed of top thread from spool. Check that top thread spool is correct orientation and spool cap is larger than spool.
See page B-25.https://download.brother.com/welcome/doch100190/888g00_g02_g04_g05_g06_om03en.pdf
With presser foot up and needle up, select tension 4 and rethread top thread. Then make a long slow steady pull of top thread. It should advance smoothly through needle eye with even tension (no snagging). Now lower foot and again make long slow steady pull of top thread. It should advance smoothly through needle eye. Note difference in no tension (foot up) and tension select 4 (foot down).
Testimonial: "Thank you! Guess the spool cap was too small!"
SOURCE: The serger is not sewing
The machine was threaded incorrectly at first, but after changing the needle I was threading it correctly. The problem ended up being the needle depth. When I inserted the new needle, I did not have pushed up into it's slot quite far enough. I pushed it up all the way and retightened the screw. Now it is serging like a dream!
SOURCE: NEEDLE KEEPS COMING UNTHREADED WILL NOT CATCH IN FABRIC
Most machines need to have the thread extend to the back of the machine in order not to come unthreaded.
SOURCE: NEEDLE KEEPS COMING UNTHREADED WILL NOT CATCH IN FABRIC
Make sure you are threading the machine correctly and it has the proper tension. Also check the bobbin the thread has to go thru the little lash
SOURCE: needle wont stay threaded when sewing
have thread tails of 4 to 6 inches long & pull the thread back behind the needle before you start sewing
SOURCE: after automatic thread cut the needle comes unthreaded
you need long thread tails, of 3 to 6 inches for the top & bobbin thread so the needle doesn't come unthreaded,
also pull the thread behind the needle before you start to sew
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