My machine suddenly stopped sewing. It is not picking up bobbin thread. There are no loops under the material. I have re-threaded it 3 times and have cleaned the bobbin area and rechecked the bobbin. I have also changed needle and thread. No luck.
Try this. Turn your bobbincase on it's side. There should be a small screw. This will adjust the tension. When you put your bobbin in the bobbin case hang onto the thread and your bobbincase should slowly go downward (like a yo-yo). If it does not move you tightened the screw too much. Hope this helps.