Brother International SB3150 Operation Manual - Page 133
Symptom, Probable Cause, Remedy, Reference
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Troubleshooting Symptom Probable Cause Remedy Reference The thread is tangled on the wrong side of the fabric. Upper threading is incorrect. Using improper needle or thread for the selected fabric. Check the steps for threading the machine and rethread the machine. Be sure that the presser foot is in the raised position when threading the machine so that the upper thread sets properly in the upper tension. B-21, A-5 Check the "Fabric/Thread/Needle Combinations" chart. B-28 The upper thread is too tight. The bobbin thread is incorrectly installed. Correctly install the bobbin thread. B-18, A-4 Bobbin thread breaks. Fabric puckers. Skipped stitches No stitching Bobbin is set incorrectly. Reset the bobbin correctly. B-18 Bobbin thread is incorrectly wound. Use a correctly wound bobbin. B-15 There are scratches on the bobbin or it doesn't rotate properly. Replace the bobbin. B-18 Thread is tangled. Use scissors, etc. to cut the tangled thread and remove it from the race, etc. A-8 A bobbin designed specifically for this machine is not used. Incorrect bobbins will not work properly. Only use a bobbin designed specifically for this machine. B-15 There is a mistake in the upper or bobbin threading. Check the steps for threading the machine and rethread it correctly. B-21 Spool cap is set incorrectly. Check the method for attaching the spool cap, then reattach the spool cap. B-21 Using improper needle or thread for the selected fabric. Check the "Fabric/Thread/Needle Combinations" chart. B-28 Needle is turned, bent or the point is dull. Replace the needle. B-29 Stitches are too long when sewing thin fabrics. Shorten the stitch length. B-40 Thread tension is set incorrectly. Adjust the thread tension. B-41 Wrong presser foot. Use the correct presser foot. B-32 Machine is threaded incorrectly. Check the steps for threading the machine and rethread it correctly. B-21 Using improper needle or thread for the selected fabric. Check the "Fabric/Thread/Needle Combinations" chart. B-28 Needle is turned, bent or the point is dull. Replace the needle. B-29 Needle is installed incorrectly. Reinstall the needle correctly. B-29 The needle is worn/damaged. Replace the needle. B-29 Dust or lint has collected under the needle plate. Remove the dust or lint with the brush. A-2 Thin or stretch fabrics are being sewn. Sew with one sheet of thin paper under the fabric. S-4, D-3 Needle is turned, bent or the point is dull. Replace the needle. B-29 Bobbin is set incorrectly. Reset the bobbin thread correctly. B-18 Upper threading is incorrect. Check the steps for threading the machine and rethread the machine. B-21 MAINTENANCE AND TROUBLESHOOTING A Appendix A-15