Can not do by yourself. Mine did the same thing after just having it 3 weeks and I had to take in to authorized Singer Dealer to repair. Now without machine for several weeks and probaly out alot of money for repair.
Should have got a Brother!! Hope you have better luck than me.
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Make sure the need is in correctly. if it is backwards or turned to one side too much it wont pick up the bobbin thread. If the needle is in right and it still wont pick up the thread then the machine is out of time.
Install a brand new needle. Make sure it is installed correctly.
Remove the bobbin/bobbin case from the machine. Check that the bobbin is turning the correct direction and the bobbin tension is threaded correctly. Reinstall the bobbin case and confirm that it is latched into place.
Retest your machine. Slowly turn the handwheel and watch the needle descend and see if it picks up the bobbin thread. If not, then there is probably a sewing machine timing issue. Take it for service.
check for problems in the bobbin winding, ( in the wrong way so that the thread is not coming out correctly)
top thread tension too tight or too loose
vary the thread tension to see when it improves on a waste test sew
First thing to always try: Install a brand new needle. A dull, worn, or bent needle will cause great frustration. It is also the least expensive resolution to most problems.
Second: Remove all the threads. RAISE the presser foot. Rethread from the beginning making sure it is threaded correctly.
Pull up the bobbin thread before beginning to stitch and hold the thread tails in the left hand while slowly taking the first few stitches:
not picking up the bobbin thread is an indication of needle / hook timing
thread tension problems appear as a mess of stitches under the cloth
the timing can be checked by having the needle full down and the hook of the bobbin case should be at the needle just above the eye of the needle
if it is too early or late then it is not in position to get the thread
I'm assuming you have a front loading bobbin. Look at your bobbin. Hold it so the thread is falling down from the top to the right side. Slip it straight in to your bobbin case, and pull up through the slit, until it snaps in through the side clip.
Generally, if you are missing stitches, the hook isn't picking up the thread from the needle, and you will need to take it in for service at a Bernina dealer.
Is your needle in backwards, always the flat shank to the back, make sure it is in all the way up in its housing too. Is it a new needle, not blunt, bent or hooked on the tip, sometimes we don't notice butthe needle is very important and should be changed every 4-6 hours sewing time. The shuttle hook goes around and catches the upper thread during stitch-formation, timing of these two parts is crucial so if this is a machine that has been damaged or do you suspect the timing is out perhaps. If so, technician time.