Brother International BAS-341F Instruction Manual - English - Page 63

Problem Cause Check 15. TROUBLESHOOTING Remedy Page Upper thread is not trimmed. Fixed knife is blunt. Fixed knife blade Movable knife does not pick up the thread. Shuttle race thread guide position Needle bar lift amount The movable knife does not pick up the thread because of skipped stitches at the sewing end. Movable knife position is incorrect. Skipped stitches at sewing end Movable knife position Sub-tension is too weak. Sub-tension Sharpen or replace the fixed knife. Adjust the position of the shuttle race thread gudie. 33 Adjust the needle bar lift amount. 32 Refer to "Skipped stitches occur". Adjust the position of the movable knife. 34 Turn the sub-tension nut to adjust the tension. 13 Thread jamming. Thread take-up spring tension and height are incorrect. Thread take up spring tension and height Adjust the tension and height of the thread takeup spring. 13 Incorrect needle and shuttle hook timing. Needle bar lift amount Adjust the needle bar lift amount. 32 Shuttle race thread guide is not separating the threads. Shuttle race thread guide position Adjust the position of the shuttle race thread guide. 33 Poor seam finish on reverse side of material. Shuttle race thread guide is not separating the threads. Upper thread is not properly tight. Uneven upper thread length. Shuttle race thread guide position Upper thread tension Upper thread length Adjust the position of the shuttle race thread guide. 33 Adjust the upper thread tension. 13 Adjust the sub-tension. 13 Incorrect thread tightness. Upper thread tension is Upper thread tension too weak. Adjust the upper thread tension. 13 Lower thread tension is Lower thread tension too weak. Adjust the lower thread tension. 13 Thread take-up spring tension and height are incorrect. Thread take-up spring tension and height Adjust the tension and height of the thread takeup spring. 13 BAS-341F, 342F 56