Bobbin jaming up - Bernina Sewing Machines

Clean the bobbin area.

Thread the machine with the presser foot up - always,

Make sure the bobbin thread is feeding clockwise and through the guides on the bobbin case.

Lower the threaded needle down and back up while holding onto the thread end. This will pull the bobbin thread up. Hold onto both threads and pull under the presser foot and to the back of the sewing machine.

Hold on to the thread ends and lower the needle into the fabric, then press the foot pedal.

You may want to use a leader - a folded scrap of fabric that you sew to the edge of and then **** against the fabric you want to sew. Sew off the leader and onto the fabric and this will keep the thread from going down into the machine. You can have a few stitches between the two to make it easy to cut the leader away.

When you stop to adjust the fabric make sure the needle is down to anchor the fabric (turning corners, sewing a curve. etc).

The slightest movement of the fabric when the needle is up will sometimes cause a thread jam.