Pfaff 132 Owner's Manual - Page 12

material - remove the needle plate and thoroughly clean the feed dog. 7. The bobbin case has developed a rough edge, causing the thread to break - remove the case and consult a sewing machine specialist. The under thread breaks 1. Inferior quality, knotty sewing thread breaks easily - use a better quality. 2. The bobbin thread tension is too severe - loosen the tension screw (see page 12: "Regulating the Thread Tensions"). 3. The bobbin thread tension is too weak - tighten the screw with a screwdriver (see page 12: "Regulating the Thread Tensions"). Stitches are missed 1. The needle has not been set high enough - change the needle, (see page 6: "Inserting the Needle">. 2. The needle is bent or blunt - change the needle. 3. The needle selected is too fine or too thick for the 20 thread used - change the needle or the thread to give the correct relation between the two; (see page 5: "Relative Needle and Thread Sizes"). 4. The thread curls, because it is unsuitable for machine sewing - use a different thread. 5. The needle used is not of the correct system - obtain correct needles from the suppliers of your machine. The needle breaks 1. The needle is wrongly inserted - reset the needle. The needle isbentorblunt change the needle (see p.6: "Inserting the Needle"). 2. The needle used is too fine for the thread or material - use a thicker needle; (see page 5: "Relative Needle and Thread Sizes"). 3. The upper thread tension is too severe - loosen the setting flange on tensioner; (see page 12: "Regulating the Thread Tensions"). Faulty feeding 1. Thread ends or dirt are interfering with the free move ment of the feed dog, resulting in bad feeding of the 21