Brother International BAS-300G Instruction Manual - English - Page 82
the thread, Incorrect tightening
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12. TROUBLESHOOTING Problem Cause Upper thread is not trimmed. Movable knife is not cutting cleanly. Remedy Replace with a new one. Reference P. 61 Fixed knife is not cutting cleanly. Sharpen the fixed knife or replace it with a new one. Movable knife is not picking up the upper thread. Adjust the position of the movable knife. Adjust the needle bar lift amount. P. 61 P. 59 P. 57 Movable knife is not picking up the upper thread because the last stitch is Refer to "Skipped stitches occur". being skipped. Movable knife position is incorrect. Adjust the position of the movable knife. Sub-tension is too weak. Poor stitch finish on underside of material. Incorrect tightening of the upper thread Turn the sub-tension nut to adjust the tension. Adjust the upper thread tension. P. 72 P. 59 P. 24 P. 24 Upper thread trailing length is uneven. Adjust the sub-tension. Incorrect tightening of the thread Upper thread tension is too weak. Adjust the upper thread tension. P. 24 P. 24 Lower thread tension is too weak. Adjust the lower thread tension. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Upper thread trailing length is irregular. Position of arm thread guide R is Adjust the position of arm thread guide incorrect. R. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Sub-tension is too weak. Turn the sub-tension nut to adjust the tension. Fixed knife is not cutting cleanly. Sewing machine does not operate when the power is turned on and the foot switch is depressed. Machine head switch does not work. Sharpen the fixed knife or replace it with a new one. Check if the machine head switch cord is disconnected. Adjust the position of the machine head switch. If the machine head switch is malfunctioning, replace it with a new one. P. 24 P. 56 P. 56 P. 56 P. 24 P. 61 P. 12 P. 9 73 BAS-300G, BAS-311G, BAS-326G