Pfaff Tiptronic 1071 Owner's Manual - Page 48
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Fault finding Cause: Neadi a nt nsert ad cur r.ctl Wrong needle used. Needle bent or blunt Machine threaded ':cutiocti. Needle too th n for thread used 2. Needle thread breaks For any of the above reasons. Threaa tension too strong. Poor-quality or knotty thread used, or thread that has become too dry by excessive storage. 3. Needle breaks Needle not pushed up as far as it will go. Needle bent. Needle too thin or too thick. Needle bent and strikes needle plate because work is pushed or pulled. Bobbin case improperly inserted. 4. Seam is not uniform Tension out of adjustment. Thread too thick, knotty or hard. Bobbin thread wound unevenly. Kinks appear on top and bottom of material Remed. Pusn naeuie up as fa u- .. I go. its flat shank aide facing toward thu hack Insert system 130/705 H needle. lnst'ur 'r,'j n'pdlp Check threading. Select needle according :o Needle and Thread Chart. See par. 1 above. Regulate thread tensions. Used only good-quality thread. Insert new needle and push it up as far as it will go. Insert new needle. See Needle and Thread Chart. Allow machine feed the work alone. Only guide the material lightly. When inserting the bobbin case, push it in as for as it will go. Check upper and lower tensions. Use first-class thread only. During bobbin winding, do not hold thread in hand, but pass it through the bobbin tenSiOn stud. Thread machine properly and check both tensions. 56