Juki makes your Brother 1500s machine. I think it is a fantastic quilting machine. Perhaps you need to check whether you have threaded it correctly and make sure the needle is put in sideways and not front - on to you? If you do all of that and it still causes a problem perhaps a service is needed. It has an excellent stitch and I use mine far more than the computerised one. Give it an oil every now and again as well. Good luck with it.