Question about Brother CS-8150 Computerized Sewing Machine

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Lower thread tangles and machine then locks up

I recently took my machine in for repair for this problem and when I got it back, it worked fine. As soon as I had to change the thread (both upper and bobbin) the same problem started all over again. I start sewing and then it makes a "clunking" type sound and when I take the fabric out from under the presser foot, its all tangled up. I have read the manual over and over again, pulled the shuttle out and made sure that area is clean. I don't know what else to do. Please help.

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Re: lower thread tangles and machine then locks up

I have the same problem. When I take it to my shop, they keep telling me there is a special order for reinstalling the shuttle case and plates on top but I get home and can't duplicate what they've told me. If you figure this one out, please let me know.

Posted on Oct 03, 2007

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The top thread is tangling underneath. I have tried everything in the manual to fix this problem and now I have no idea what to do. I have only used this machine about 2 times, then my sister used i

Most likely, you're starting seams incorrectly.
Pull out about 3" of bobbin and top thread.
Raise the needle to full travel height.
Put the fabric under the needle and lower the needle, turning the handwheel in the direction that causes the fabric to feed from the front to the back of the machine.
Drop the presser foot.
Hold the bobbin and top thread ends behind the presser foot while you take the first couple of stitches.
Drop the thread ends and sew normally.

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Make sure there are no bits of thread in the lower bobbin area, under and around the feed dogs (remove needle plate), etc.

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First the top tension started being loose, so I changed the tension different ways and tried to fix the thread is getting all tangled up under the fabric and is locking up. Also giving me the E6...

Do you mean the stitching on the top of the work was loose? If so, you should check the bobbin tension. Make sure you have the thread pulled under the tension plate or spring on the bobbin case. Tension should be just enough that you can suspend the bobbin in the case by the thread (think yo-yo). Upper tension should be tighter than lower. Make sure you put the presser foot down.

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I place the fabric on the machine, lower the foot and apply pressure to the foot peddle, when the machine begins to sew fabric is pulled down and the lower thread tangles, the machine make a crunching...

This is easily solved. Before you start sewing make sure your upper and lower threads are long enough for you to hold before lowering the presser foot. If these threads are too short they both get carried down into the bobbin along with the fabric and cause a big tangled mess. Always hold your threads at the back of your work with your left hand then lower your pressure foot and don't release the threads untill you have taken several stitches. Keep holding these threads during backstitching at the beggining of a seam too. Works like magic.

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Thread is tangling on the lower bobbin

check the needle first.Bent or spurred needles will result in this action.

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Check to see if the lower thread be tangled. Also, the bobbin could be threaded improperly in the shuttle hook. Rethread the bobbin in the shuttle hook.
How to detangle a thread---

  • When a machine stops operation due to tangled thread, do not turn the pulley by force.
    If the pulley is turned by force then, lower thread might not be picked up correctly and stitches might not be formed correctly.

  • If threads get tangled, remove a needle plate and cut the tangled threads by scissors or cutter.
  • Do rate the solution if you find it helpful & useful.


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