TroubleshootingA-18■ After sewingSymptom Probable Cause Remedy ReferenceThread tension isincorrect.Upper threading is incorrect. Check the steps for threading the machine andrethread the machine.B-18Bobbin is set incorrectly. Reset the bobbin. (If needle plate was removed,reinstall needle plate and tighten screws prior toinstalling bobbin case. Check to make sureneedle enter through the center of needle plateopening.)B-15, A-2Using improper needle or thread for theselected fabric.Check the “Fabric/Thread/NeedleCombinations” chart.B-25Presser foot holder is not attached correctly. Reattach the presser foot holder correctly. B-29Thread tension is set incorrectly. Adjust the thread tension. B-37, A-6Bobbin thread is incorrectly wound. Use a correctly wound bobbin. B-12Needle is turned, bent or the point is dull. Replace the needle. B-26A bobbin designed specifically for this machineis not used.Incorrect bobbins will not work properly. Onlyuse a bobbin designed specifically for thismachine.B-12Character ordecorative patternsare misaligned.Pattern adjustment settings were set incorrectly. Revise the pattern adjustment settings. D-7Pattern does notturn out.Wrong presser foot was used. Attach the correct presser foot. B-29Did not use a stabilizer material on thin fabricsor stretch fabrics.Attach a stabilizer material. S-4, D-3Thread tension is set incorrectly. Adjust the thread tension. B-37, A-6Fabric was pulled, pushed or fed at an anglewhile it was being sewn.Sew while guiding the fabric with your hands sothat the fabric is fed in a straight line.B-32The thread is tangled, for example, in thebobbin case.Remove the tangle thread. If the thread istangled in the bobbin case, clean the race.A-7
