Brother International S-7200C Instruction Manual - English - Page 50
THREAD TENSION, 10-1. Adjusting the thread tension
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10. THREAD TENSION 10. THREAD TENSION 10-1. Adjusting the thread tension CAUTION Turn off the power switch before removing or inserting the bobbin case. The machine may operate if the treadle is depressed by mistake, which could result in injury. Good even stitches 0572M Upper thread Lower thread 0573M Upper thread tension too weak or lower thread tension too strong Increase the upper thread tension. Decrease the lower thread tension. 0574M Upper thread tension too strong or lower thread tension too weak Decrease the upper thread tension. Increase the lower thread tension. Adjust by turning the adjustment screw (1) until the bobbin case drops gently by its own weight while the thread end coming out of the bobbin case is held. Becomes weaker Becomes stronger 2177M After the lower thread tension has been adjusted, adjust the upper thread tension so that a good, even stitch is obtained. 1. Lower the presser foot. 2. Adjust by turning the tension nut (2). Becomes weaker Becomes stronger 4229M 43 S-7200C