Brother International SB3150 Operation Manual - Page 134

Troubleshooting Symptom Probable Cause Remedy Reference High-pitched sound while sewing Fabric does not feed through the machine. Dust or lint is caught in the feed dogs. Remove the dust or lint. A-2 Pieces of thread are caught in the race. Clean the race. A-2 Upper threading is incorrect. Check the steps for threading the machine and rethread the machine. B-21 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 are needle holes or friction scratches in the bobbin case. Replace the bobbin case, or consult your authorized Brother dealer. A-2 Feed dogs are set in the down position. Slide the feed dog position switch to the right B-2 . Stitches are too close together. Lengthen the stitch length setting. B-40 Wrong presser foot was used. Use the correct presser foot. B-32 Needle is turned, bent or the point is dull. Replace the needle. B-29 Thread is entangled. Cut the entangled thread and remove it from the race. A-8 Zigzag foot "J" is slanted on a thick seam at the beginning of stitching. Use the presser foot locking pin (black button on the left side) on zigzag foot "J" to keep the presser foot level while sewing. S-4 Presser foot pressure is set incorrectly for fabric. Adjust the presser foot pressure within the settings screen. B-44 The fabric feeds in the opposite direction. The feed mechanism is damaged. Contact your authorized Brother dealer or the nearest Brother authorized service center. - The needle contacts the needle plate. The needle clamp screw is loose. Needle is turned, bent or the point is dull. Firmly tighten the needle clamp screw. If the needle is bent or blunt, replace it with a new one. Replace the needle. B-29 B-29 Fabric being sewn with the machine cannot be removed. Thread is tangled below the needle plate. Lift up the fabric and cut the threads below it, and clean the race. A-8 A broken needle has fallen into the - machine. Turn off the machine, and then remove the needle plate. If the needle that fell into the machine can be seen, use tweezers to remove it. After removing the needle, return the needle plate to its original position and insert a new needle. Before turning on the machine, slowly turn the handwheel toward you to check that it turns A-8 smoothly and that the new needle enters through the center of the needle plate opening. If the handwheel does not turn smoothly or the needle that fell into the machine cannot be removed, contact your authorized Brother dealer or the nearest Brother authorized service center. The handwheel feels sluggish when it is turned. Thread is tangled in the bobbin case. Remove the tangled thread from the bobbin case. Re-install the bobbin case so it is correctly positioned. A-5, A-8 A-16