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try changing the needle rethread the machine top & bobbin make sure the bobbin is inserted correctly in the bobbin case make sure the top thread is not coming off the thread take up lever make sure the bobbin is wound correctly if these suggestions don't work, I suggest that you take the machine to a sewing machine shop to have it checked
I am not sure about this particular machine but in most machines there will be a nob on the front loose low numbers like 0 1 -2 work well on number 3. If the nob is not on the front check and see if it is on the side.
A sewing machine operator can often help themselves when their machine does not operate properly. Here are some simple instructions, which if properly used can save time and mechanics service calls. TROUBLE;UPPER THREAD KEEPS BREAKING; This could be trouble;================Do this; 1.Top tension to tight================loosen tension 1 turn 2.Machine improperly threaded=========check threading 3.Thread twisted on guide post========" 4.Thread twisted out of tension=======" 5.Take up spring bent or broken=======Check action of spring 6.Thread jumped off pull off finger===Check threading 7.Needle bent or burred===============new needle 8.Bad cone of thread==================try another cone TROUBLE;LOWER THREAD KEEPS BREAKING; 1.Bobbin tensionspring to tight=======Loosen tension slightly 2.Bobbin threaded wrong===============check threading 3.Bobbin wound to tight or uneven=====try new bobbin 4.lint or thread on bobbin case=======clean inside case 5.Lint or thread inside hook==========clean inside hook 6.Bobbin case nicked bent or burred===check/change case TROUBLE;MACHINE STARTED SKIPPING STITCHES; 1.Needle bent or burred===============change 2.Needle set in crooked===============Check 3.Thread jumped off take up spring====check threading 4.Thread jumped off pull off finger===check threading TROUBLE STITCHES SHOWING LOOPS; 1.Forming loops on top of cloth=======Tighten bobbin tension ======================================or loosen top tension. 2.forming loops on bottom of cloth====Tighten top tension 3.Bobbin placed in case incorrectly===remove and replace 4.Bobbin thread slipped from under====check threading of tension===============================bobbin case 5.Lint or thread in top tension=======clean between tension discs
It is the top threading that is giving you the problem not the bobbin thread. Try this, totally rethread, the machine. A new needle will not hurt either. Now with the presser foot up, pull on the top thread, it should feed smoothly, now lower the presser foot, pull the thread again, it should barely move. This usually will seat the thread in the tension discs. Good luck and Merry Christmas
I would say that the threading is wrong somewhere, watch your dvd and read the owners manual, also go to Singer.com FAQ for your machine, If the jamming is underneath, it is the top threading problem, on top, it is the bobbin thread either has lint or stray thread or thread not coming out the right direction for your bobbin, I am sure that it is just a simple solution, I also use metal SA 156 bobbins and have no problems,
It sounds like you don't have any tension on the thread when winding the bobbin. Make sure that you are running the thread through the tension disc on the top of the machine before going to the bobbin winder.