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My brother 770 keeps saying safety device has been activated, I have taken the bobbin case and everything off and cleaned it, have also changed the needles, etc. it will sew for a few minutes then messes up again and the thread is all tangled on the backside and the bobbin case is in correctly??? Not sure what could be wrong??

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  • Sewing Machines Master
  • 7,365 Answers

Check to see if the top thread has come off the thread take up lever
trying turning the bobbin over the opposite direction
also possible that there is a timing problem with the machine and
it needs to be checked by a repair technican

Posted on Dec 04, 2012

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Posted on Jan 02, 2017

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  • 255 Answers

SOURCE: I have a Brother CS-770.

Hi. It's very likely that the needle is inserted wrong. Take the needle out and make sure that the flat shank of the needle is facing away from you (to the rear of the machine).

Try this and let me know if it helps, ok?

Robbie

Posted on Aug 13, 2010

  • 89 Answers

SOURCE: I have a Bernina Deco

First make sure you have the presser foot lever up when threading the machine.
It you have been doing that then I would check the bobbin area for burs of any kind on the bobbin basket (sometimes you can sand the off). That's about all you can do with the covers on.
Hope this helps

Posted on Mar 24, 2011

  • 1788 Answers

SOURCE: (THIS IS A PREVIOUS POST

Are you saying that you changed the needle? You cannot tell if your needle has a burr on it or not. Because if you did, you may have messed up your timing and need service because it will take special tools and know how to fix it. . Try another needle one more time (make sure that the flat side faces away from you) and different thread. Rethread with your presser foot up, then pull the top thread, it should move smoothly, now lower the presser foot and pull the thread, it should barely move. This should seat the thread in the tension discs. Also, check that you aren't using the wrong size needle for the task at hand.

Posted on Apr 17, 2011

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(THIS IS A PREVIOUS POST BUT I AM HAVING THIS SAME PROBLEM. BUT THE TROUBLE SHOOTING THE NEEDLE HASN'T SOLVED THE ISSUE. ANY OTHER ADVICE?) I have a Brother CS-770. My fabric got pulled down into my...


Are you saying that you changed the needle? You cannot tell if your needle has a burr on it or not. Because if you did, you may have messed up your timing and need service because it will take special tools and know how to fix it. . Try another needle one more time (make sure that the flat side faces away from you) and different thread. Rethread with your presser foot up, then pull the top thread, it should move smoothly, now lower the presser foot and pull the thread, it should barely move. This should seat the thread in the tension discs. Also, check that you aren't using the wrong size needle for the task at hand.

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