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How old is your thread? Old thread will break fairly easy, also you want just enough drag to keep the thread from over feeding but not so tight it will brake thread
Make sure you are threaded correctly. Also be sure that your bobbin is sitting in the casing correctly. If the timing is right and the hook is catching, the thread may not be pulling through correctly. Clean your machine as well. Make sure your tension spring is clean and doesn't need to be tuned up.
try youtube for a video or ebay for a manual or sewvacdoctor.com a1sewingmachines.com sewusa.com you will have to call them or email them about a manual
Ok,...to see if the tension is functioning properly, thread the machine and be sure the presser foot in in the up/raised position. When the foot is up the thread should pull easily thru the eye of the needle, lower the foot and the thread should become harder to pull thru the needle (set the tensiondial on 4 or 5). If it as I described, the tenson is working.
looping indicates that the tension is not correct best thing to do is get some remnant fabric to hoop up while you work at adjusting your tensions, it sounds like your tension is too loose and sometimes it can take more than one needle change needles like anything can be defective
Here is an easy way to get your thread adjusted. Rethread the machine using four different colors. Then sew and for example the "yellow" thread is loose on the fabric, you know to adjust the tension with the yellow thread. Also a good starting place on your dials is 4-3-2-1 from left to right. Start with the tension set there and then adjust as needed.
It is the dial to the right of the take up arm on top. If you go all the way to 10 and nothing happens then you'll need to take it to your nearest technician or Bernina dealership. Also its possible you may have put your bobbin in the bobbincase the wrong way. After putting the bobbin in the case and pulling the thread the bobbin should turn clockwise.
Good luck.
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