Brother International SB3150 Operation Manual - Page 125
Maintenance And Troubleshooting
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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" in the "Basic operations" section to check that a needle and thread appropriate for the fabric are being used. Cause 3 An appropriate upper tension is not selected. The setting selected for the upper thread tension is not appropriate. Refer to "Setting the thread tension" in the "Basic operations" section to select an appropriate thread tension. 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 Using thread tension key (For models equipped with thread tension key. Refer to page B-8) Press "-" to decrease the tension of the upper thread. Troubleshooting • If the upper thread is visible from the wrong side of the fabric Using thread tension key (For models equipped with thread tension key. Refer to page B-8) Press "+" to increase the tension of the upper thread. Using thread tension dial (For models equipped with thread tension dial. Refer to page B-8) Turn the thread tension dial to the right to increase the tension of the upper thread. A MAINTENANCE AND TROUBLESHOOTING Using thread tension dial (For models equipped with thread tension dial. Refer to page B-8) Turn the thread tension dial to the left to decrease the tension of the upper thread. Appendix A-7