Brother International LK3-B430 Service Manual - Page 42

• • tv:;71-;-aiTroublei1, - .73 • Upper thread breaks. rLower thread breaks. Lower thread snaps. Stitches skip. 1 Needle breaks. Upper thread tension is too - great. Needle is installed in wrong way. Upper thread tension Needle direction I H . Adios' upper thread tension 1 Lt Install needle so its I.ong grolise laces front. Thread is too thick for needle. Thread take-up spring - tension and height are incorrect. Shuttle hook, needle hole plate or needle has flaws or burrs. Thread and needle Thread take-up spring tension and height Flaws. burrs Heat -. Thread end Select thread suitable to needle. Adjust thread take-up spring tension and height. 2 1 A Polish or replace delectise parts. t tse liquid cooler. ,..1 Linker thread tension is too great. Lower thread tens:17 2 .1Adjust kisser thread tension. Needle hole plate or bobbin case edge has flaws. Thread retainer position is wrung. d Thread retainer has Haws. Clearance between needle and shuttle hook point is too n great. dNeedle and shuttle timing is wrong. Driser recent:s needle more than mei:silty Needle is bent. Haws Thread retainer position Flaws Needle and shuttle hook clearance Polish or replace delectise parts. Adjust minable knife I 32 position. Polish thread path. or replace thread retainer. 24 Adjust needle and shuttle hook clearance. Needle bar stroke Adjust needle bar stroke. 23 Clearance between driser H and needle Needle bend Adjust driser and needle contact. Replace needle. 23 J A Needle is installed wrong Needle direction .-. Needle hits shuttle hook. HNeedle and shuttle hook clearance Needle bar stroke Install needle w its long gruose faces front. 23 Adjust needle and shuttle hook clearance. Adjust needle bar stroke. 1 • Needle is bent. Needle runs oil- course. Needle bend Needle and teed timing - 42 - Replace needle A L T 1 Adjust needle and teed T timing.