Brother International SE625 Operation Manual - Page 81

Troubleshooting Upper thread tightened up ■ Symptom • The upper thread appears as a single continuous line. • The bobbin thread is visible from the right side of the fabric. (Refer to the illustration below.) • The upper thread has tightened up, and comes out when pulled. • The upper thread has tightened up, and wrinkles appear in the fabric. • The upper thread tension is tight, and the results do not change even after the thread tension is adjusted. c a b d e 1 Wrong side of fabric 2 Bobbin thread visible from right side of fabric 3 Upper thread 4 Right side of fabric 5 Bobbin thread ■ Cause Incorrect bobbin threading If the bobbin thread is incorrectly threaded, instead of the appropriate tension being applied to the bobbin thread, it is pulled through the fabric when the upper thread is pulled up. For this reason, the thread is visible from the right side of the fabric. ■ Remedy/check details Correctly install the bobbin thread. (page 16) Tangled thread on wrong side of fabric ■ Symptom • The thread becomes tangled on the wrong side of the fabric. ■ Cause Incorrect upper threading If the upper thread is incorrectly threaded, the upper thread passed through the fabric cannot be firmly pulled up and the upper thread becomes tangled in the bobbin case, causing a rattling noise. ■ Remedy/check details Remove the tangled thread, and then correct the upper threading. Remove the tangled thread. If it cannot be removed, a cut the thread with scissors. • For details, refer to "Cleaning the race" on page 77. Remove the upper thread from the machine. b Correct the upper threading by following the c instructions in "Threading the upper thread" on page 17. • If the bobbin was removed from the bobbin case, refer to "Installing the bobbin" on page 16 to correctly install the bobbin. Incorrect thread tension ■ Symptoms • Symptom 1: The bobbin thread is visible from the right side of the fabric. (Refer to illustration below) • Symptom 2: The upper thread appears as a straight line on the right side of the fabric. • Symptom 3: The upper thread is visible from the wrong side of the fabric. (Refer to illustration below) • Symptom 4: The bobbin thread appears as a straight line on the wrong side of the fabric. • Symptom 5: The stitching on the wrong side of the fabric is loose or has slack. … Symptom 1 … Symptom 3 a b c d a f c d APPENDIX 5 • After starting sewing, a rattling noise is made and sewing cannot continue. • Looking under the fabric, there is tangled thread in the bobbin case. e e 1 Wrong side of fabric 2 Bobbin thread visible from right side of fabric 3 Upper thread 4 Right side of fabric 5 Bobbin thread 6 Upper thread visible from wrong side of fabric ■ Cause/remedy/check details … Cause 1 The machine is not correctly threaded. The bobbin threading is incorrect. Return the thread tension dial to "4", and then refer to "Upper thread tightened up" on page 79 to correct the threading. 79