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Try installing a brand new needle. Verify you are using the correct needle for your machine.
Remove the upper thread. Always raise the presser foot and rethread from the beginning. Make sure the threading path is correct.
Set the tension to the midway point between high & low numbers (this is usually the factory standard, although each machine may need a slight tweak and the type of fabric & thread may require a tension adjustment).
Check that the bobbin is inserted properly in the bobbin case and that the bobbin case is threaded correctly.
Retest your machine.
If it is still not picking up the bobbin thread, most likely there is a needle/hook timing issue. Take it for service.
Install a brand new needle (make sure it is installed correctly). Remove the thread. RAISE the presser foot and rethread from the beginning making sure the thread path is correct. Verify the bobbin has been inserted in the bobbin case correctly and the bobbin case has been threaded properly. Have at least 4-6" of thread tail on both threads. Retest.
If it is still not picking up the thread, then the needle/hook timing may be off and should be serviced by a technician.
You can take the slide plate off, that your needle goes through and watch to see if the arm grabs the bobbin thread, if you can get it to pick up, than slide scissors or something flat under your needle and manually pull both threads through, replace the plate.
Your bobbin thread could be wound to tight or spliced threads on it, and your tension needs to be adjusted. If your using a pedal, try setting to a slower speed.
I would try a different bobbin and thread it manually as in the step I mentioned, if you can't see the arm grabbing it, you will need to check to see if you have loose threading jammed in youir machine, if this isn't the case and adjusting the tension dosen't help...than you will need to replace the bobbin casing.
it sounds like no bobbin thread tension. there should be some resistance when you pull on the bobbin thread. if there is none or too little you may have some lint or thread caught behind the bobbin case tension spring.
very carefully try and push the tip of a thin pin into the bobbin case tension spring and pick any accumulated thread or lint out.
if the bobbin case spring is clean, try tightening the bobbin tension a little at a time until your zig zag looks ok.
of-course all this is done after checking needle threading and needle for damage.
Unusual for this machine. Check to be sure the needle is inserted with the flat side to the back of the machine. If it is, remove the needle plate, bobbin and bobbin case. Turn the hand wheel slowly toward you and see if the point of the hook is above or below the eye of the needle when the hook point is aligned behind the needle. If the eye is above the point of the hook the machine is out of time and best taken to qualified technician.
If re-threading, changing the brand of thread, etc. does not work, then it's likely your machine is out of time. Search for sewing machine timing or take it for service.
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