Pfaff 339 Owner's Manual - Page 68

- - - - - The bobbin thread breaks: The machine skips stitches: 1. Knotty, inferior thread is being used - use a better quality, 2. The bobbin thread tDnsion is too strong - loosen it (see page 25). 3. The bobbin case teison is too weak - tighten it (see page 25). 4. The needle is bent - replace it by a new one (see page 10). 5. The bobbin thread is wound unevenly - wind evenly and not too tight. 1. The needle is not inserted all the way up in the needle clamp - correct this (see page 10). 2. The needle is bent or blunt the needle (see page 10). replace 3. Thread tensions are incorrectly set - adjust them (see pages 24 and 25i. 4. The needle is too fine or too thick for the thread - replace the needle or the thread so they will suit each other and the material (see pages 10, 11 and 12). 6. The bobbin case has a rough spot - take out the bobbin case and consult your dealer, 70 5. The thread curs up because it is un suitable for machine sewing - use suitable thread.