Pfaff coverlock 4872 Owner's Manual - Page 75
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Prob'em Machine will not operate although master switch is on. Cause Power supply interrupted Souton Close looper cover (see page 8) Fabric not neatly trimmed Waste thread between upper and lower blade Upper blade is blunt. Clean blades. Replace upper blade (see page 66). Puckered seams Thread tension too tight. Incorrect setting of differential feed. Thread has caLight due to incorrect threading. Reduce thread tension Re-adjust differential feed (see pages 38, 39) Thread correctly (see pages 14- 23). Fabric not fed through evenly Stitches too short Sewing foot pressure too (ow for heavy fabrics. Sewing foot pressure too high for lightweight fabrics. Increase stitch length see page 35) Increase sewing foot pressure (see page 291. Reduce sewing foot pressure (see page 29). 71
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