Brother International HS-2500 Users Manual - English - Page 87
Incorrect thread tension
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Incorrect thread tension ■ Symptoms • Symptom 1: The lower thread is visible from the upper side of the fabric. • Symptom 2: The upper thread appears as a straight line on the upper side of the fabric. • Symptom 3: The upper thread is visible from the lower side of the fabric. • Symptom 4: The lower thread appears as a straight line on the lower side of the fabric. • Symptom 5: The stitching on the lower side of the fabric is loose or has slack. Symptom 1 Symptom 3 a Lower side of fabric b Lower thread visible from upper side of fabric c Upper thread d Upper side of fabric e Lower thread f Upper thread visible from lower side of fabric ■ Cause/remedy/check details Cause 1 The machine is not correctly threaded. The lower threading is incorrect. Return the upper tension-control dial to "4", and then refer to "Upper thread tightened up" (page 81) to correct the threading. The upper threading is incorrect. Return the upper tension-control dial to "4", and then refer to "Tangled thread on wrong side of fabric" (page 82) to correct the upper threading. Cause 2 A needle and thread appropriate for the 4 fabric are not being used. The sewing 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 "Needle types and their uses" (page 28) to check that a needle and thread appropriate for the fabric are being used. Cause 3 An appropriate setting on the upper tension-control dial is not selected. Turn the upper tension-control dial to select an appropriate thread tension. The appropriate thread tension differs according to 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 lower threading are incorrect, the thread tension cannot be adjusted correctly, even by turning the upper tension-control dial. Check the upper threading and lower threading first, and then adjust the thread tension. • When the lower thread is visible from the upper side of the fabric. Turn the upper tension-control dial to a lower number (toward the left). (Loosen the thread tension.) • When the upper thread is visible from the lower side of the fabric. Turn the upper tension-control dial to a higher number (toward the right). (Tighten the thread tension.) 54 3 54 3 85