Brother International SB3129 Operation Manual - Page 145
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Symptom Probable Cause Remedy Reference The upper thread was not threaded correctly, or the bobbin is incorrectly installed. Correctly thread the upper thread and correctly install the bobbin thread. page 22, 24 The spool is incorrectly installed. Correctly install the spool. page 24 The fabric is wrinkled. The combination of fabric, thread and needle is not correct. Select a thread and needle that are appropriate for the type of fabric being sewn. page 33 The needle is bent or blunt. Replace the needle. page 34 If thin fabrics are being sewn, the stitch is too coarse. Shorten the stitch length or sew with stabilizer material under the fabric. page 56 The thread tension is incorrect. Adjust the tension of the upper thread. page 54 The upper thread was not threaded correctly. Correct the upper threading. page 24 Stitches are The combination of fabric, thread and needle is not correct. Select a thread and needle that are appropriate for the type of fabric being sewn. page 33 skipped. The needle is bent or blunt. Replace the needle. page 34 The needle is incorrectly installed. Correctly install the needle. page 35 4 Dust has accumulated under the needle plate or in the shuttle. Remove the needle plate cover and clean the shuttle. page 135 Dust has accumulated in the feed dogs or in the shuttle. Clean the shuttle. page 135 A high-pitched noise is made while sewing. The upper thread was not threaded correctly. The shuttle is scratched, or has a burr on it. Correct the upper threading. Replace the shuttle. Contact your retailer or the nearest authorized service center. page 24 - 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. page 18 The needle The needle was not raised. threader cannot be used. The needle is incorrectly installed. Press the needle position button to raise the needle. Correctly install the needle. page 27 page 35 The presser foot that is used is not Attach the presser foot that is appropriate for the type of stitch that appropriate for the type of stitch that you wish to sew. you wish to sew. page 128 The stitch is not sewn correctly. The thread tension is incorrect. Adjust the tension of the upper thread. page 54 The thread is tangled, for example, in the shuttle. Remove the tangle thread. If the thread is tangled in the shuttle, clean the shuttle. page 135 The feed dogs are lowered. Slide the drop feed lever to the left. page 97 The fabric does not feed. ▼ The stitch is too fine. The presser foot that is used is not appropriate for the type of stitch that you wish to sew. Lengthen the stitch length. Attach the presser foot that is appropriate for the type of stitch that you wish to sew. page 56 page 128 Troubleshooting 139