Pfaff dorina 75 Owner's Manual - Page 48

Faults and how to remedy them: Cause: Needle thread breaks Remedy: Needle not properly threaded Thread tension too tight Something is wrong with the needle Thread is too heavy for needle Thread check spring is broken Needle not properly inserted Needle plate, shuttle or sewing foot damaged Thread properly Loosen tension Replace needle Change Have a new spring fitted Insert needle properly Replace Bobbin thread breaks Bobbin thread entangled because of incorrectly wound bobbin Bobbin thread not under tension spring on bobbin case Wind bobbin correctly Thread bobbin correctly Stitches are left out Needle not properly fitted on needle bar Needle bent or blunt Needle worn Fit needle properly Replace Replace Needle breaks Needle bent Needle not properly fitted Fabric too heavy or too hard You are pulling on the fabric Replace Fit needle properly Use needle of correct size Do not pull 47