Brother International SE425 Operation Manual - Page 158
Adjust the tension of the upper
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APPENDIX Symptom Probable Cause Remedy The lower thread is tangled or breaks. 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. The thread is tangled on the wrong side of the fabric. The upper thread was not threaded correctly. Correct the upper threading. The upper thread was not threaded correctly. Correct the upper threading. Make sure that the thread is hanged on the thread guide spring which is on the left side of the thread guide cover. The bobbin thread is incorrectly installed. Correctly install the bobbin thread. The thread tension is incorrect. The combination of fabric, thread and needle is not correct. The presser foot holder is incorrectly installed. Select a thread and needle that are appropriate for the type of fabric being sewn. Correctly install the presser foot holder. The thread tension is incorrect. Adjust the tension of the upper thread. 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. The upper thread is The bobbin thread is incorrectly too tight. installed. Correctly install the bobbin thread. The upper thread was not threaded correctly, or the bobbin is incorrectly installed. Correctly thread the upper thread and correctly install the bobbin thread. The spool is incorrectly installed. Correctly install the spool. 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. The needle is bent or blunt. Replace the needle. If thin fabrics are being sewn, the Shorten the stitch length or sew with stitch is too coarse. stabilizer material under the fabric. The thread tension is incorrect. Adjust the tension of the upper thread. The upper thread was not threaded correctly. Correct the upper threading. Stitches are skipped. 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. The needle is bent or blunt. Replace the needle. Reference page 22 page 32 page 32, page 33 page 27 page 39 page 45 page 59 page 22 page 27 page 22, page 31 page 31 page 39 page 41 page 59, page 66 page 59 page 32 page 39 page 41 156