Pfaff 90 Owner's Manual - Page 28
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' 7 Y 6 11e 4 $ 1h1 ,c1 tt 1. Machine Skips Stitches Cause: Needle incorrectly inserted. Wrong needle. Needle bent. Machine threaded improperly. Needle too fine or too thick for the thread. Remedy: Push needle up as far as it will go and be sure that the long groove faces toward you, and flat side of shank away from you. Choose the correct needle from chart on page 12. (For ordinary sewing, use System 130 R needles.) Insert new needle. Check and correct threading as instructed on pages 14 and 15. Use correct needle and thread (see chart on page 12). 2. Needle Thread Breaks Cause: Remedy: The above mentioned may cause thread breakage. See remedies listed under 1. above. Thread tension too tight. Adjust tensions as instructed. Poor or knotty thread used. Use good quality threads only. [ Hook raceway is jammed with thread or Clean and oil hook raceway. needs Oiling. Burrs or sharp edges on needle plate slot. Polish needle plate slot with fine emery cloth. 25 L