Brother International SE725 Operation Manual - Page 88
Incorrect thread tension
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Troubleshooting 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 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 "Installing the bobbin" on page 22 to correct the threading. The upper threading is incorrect. Return the thread tension dial to "4", and then refer to "Threading the upper thread" on page 23 to correct the upper threading. Cause 2 A needle and thread appropriate for the fabric are not being used. The machine needle that should be used depends on the type of fabric sewn and the thread thickness. If a needle and thread appropriate for the fabric are not being used, the thread tension will not be adjusted correctly, causing wrinkles in the fabric or skipped stitches. • Refer to "Fabric/Thread/Needle Combinations" on page 27 to check that a needle and thread appropriate for the fabric are being used. Cause 3 An appropriate upper tension is not selected. Select an appropriate thread tension. Refer to "Adjusting the Thread Tension" on page 36. The appropriate thread tension differs depending on the type of fabric and thread being used. * Adjust the thread tension while test sewing on a piece of scrap fabric that is the same as that used in your project. Note • If the upper threading and bobbin threading are incorrect, the thread tension cannot be adjusted correctly. Check the upper threading and bobbin threading first, and then adjust the thread tension. • If the bobbin thread is visible from the right side of the fabric Turn the thread tension dial counterclockwise to loosen the upper thread tension. • If the upper thread is visible from the wrong side of the fabric Turn the thread tension dial clockwise to tighten the upper thread tension. 86
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