Start with brand new needles. Make sure you use sharp needles for woven and ball point for knits.
Remove all threads from machine. Open all covers,, including top cover (under thread tension). Remove all lint. Oil moving parts. Replace covers.
Thread your machine from right to left. In other words, start with the lower looper, upper looper, right needle, then left needle. That should solve your problem. Thread must be threaded in specific order and through every loop in order to work. One miss threaded loop will cause the machine not to sew properly.
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