Brother International LK3-B438E MKII Instruction Manual - English - Page 60
CHECKING THE, Turn the sub-tension
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Problem Cause Check 16. TROUBLESHOOTING Remedy Page Upper thread is not trimmed. Thread jamming. Poor seam finish on reverse side of material. Incorrect thread tightness. Button breaks. Fixed knife is blunt. Movable knife does not pick up the thread. The movable knife does not pick up the thread because of skipped stitches at the sewing end. Movable knife position is incorrect. Sub-tension is too weak. Thread take-up spring tension and height are incorrect. Incorrect needle and rotary hook timing. Shuttle race thread guide is not separating the threads. Shuttle race thread guide is not separating the threads. Upper thread is not properly tight. Fixed knife blade Shuttle race thread guide position Needle bar lift amount Skipped stitches at sewing end Movable knife position Sub-tension Thread take-up spring tension and height Needle bar lift amount Shuttle race thread guide position Shuttle race thread guide position Upper thread tension. Sharpen or replace the fixed knife. Adjust the position of the shuttle race 31 thread guide. Adjust the needle bar lift amount. 30 Refer to "Skipped stitches occur". Adjust the position of the movable knife. 32 Turn the sub-tension nut to adjust the 23 tension. Adjust the tension and height of the 24 thread take-up spring. Adjust the needle bar lift amount. 30 Adjust the position of the shuttle race 31 thread guide. Adjust the position of the shuttle race 31 thread guide. Adjust the upper thread tension. 23 Uneven upper thread length. Upper thread length Adjust the subtension. 23 Upper thread is too long. Thread take-up lever stroke Adjust the thread take-up lever stroke. 32 Needle is striking the button. Needle down setting Refer to "6 CHECKING THE SEWING PATTERN". 20 Upper thread tension is too weak. Upper thread tension Adjust the upper thread tension. 23 Lower thread tension is too weak. Thread take-up spring tension and height are incorrect. Lower thread tension Thread take-up spring tension and height Needle is striking the button. Needle down setting LK3-B438E Mark II Adjust the lower thread tension. 23 Adjust the tension and height of the 24 thread take-up spring. Refer to "6 CHECKING THE 20 SEWING PATTERN". 54