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Here is your owner's manual. http://www.brother-usa.com/accessories/accessories.aspx?ASKU=193385012#.UJbJpIa8iuk
Make sure you have fresh serger thread and at it is best when you first start to use as many different colors as there are spool holders. This way you will learn which thread is doing what on the finished seam. Sergers can be frustrating...so take your time to really understand how they work.
One final note. EVERY new material needs a new tension adjustment. Always test sew on scrap and adjust tension to balance stitches before you try sewing your project.
here are some suggestions
Is machine threaded correctly, check each thread guide, all tension dics
Are needles inserted correctly
Are the needles bent or damaged
Is tension adjusted to tightly
Is tension adjusted to accommodate thickness of thread being used
Are you using good quality thread
Is thread feeding off cone/spool freely
Is the needle size correct for the type of fabric being used
Are the needles being used the correct ones for the machine
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