Pfaff 1540 Owner's Manual - Page 80

Maintenance and tronb1e-shootin F Troub(e-shootng Problem: Remedy: The machine skips stitches The needle is not properly inserted. 1 Push needle fully upwards, flat side The wrong needle is inserted facing the back. Use a needle system 130/705 H. I Needle is bent or blunt. Machine is not properly threaded. Insert a new needle. Check how machine is threaded. F Needle is too small for thread. Use a larger needle, F Needle thread breaks See reasons above. See above. F Thread tension is too tight. Adjust thread tension. Thread is poor or has slubs in it, or has Only use good threads. F become dry after too-long storage. Thread is too thick. F Use needle with large eye (System 130 N). Needle breaks oft Needle is not pushed fully in. Needle is bent Insert new needle and push fully in. F Insert new needle. Needle is too thick or too thin See needle chart (page 64) F Needle is bent, and has hit the needle Let the machine feed the fabric. plate because you are pulling or Only guide the fabric lightly pushing the fabric. The bobbin case is not properly installed. When you insert the bobbin case, F push it fully into the stop. Seam is sewn unevenly The tension needs adjusting Thread is too thick, slubbed or hard The bobbin thread is unevenly wound. Thread bunching at top or bottom side of fabric F Check top and bottom tensions. Only use perfect threads F Do not wind thread free-hand, but run it on through the winding tension. Thread up correctly. Check needle and bobbin thread tensions Machine does not feed or feeds irregularly Sewing lint has collected between the feed dog teeth rows Remove needle plate, remove lint with brush. Feed dog is lowered, slide A (see page 27) Push slide B (see page 27) to left. at right. Machine is running with difficulty There are thread remnants in the hook race Remove the threads and apply one drop of oil to the hook. Important note: Before you replace sewing feet or needles, you must switch off the main switch. o not start the threaded machine without fabric in it. If you leave the machine, even for a short time, do not forget to switch off the main switch. This is important if children are nearby.