Brother International BAS-342E Instruction Manual - English - Page 63

15. Troubleshooting Problem Cause Check Remedy Page Upper thread is not trimmed. Fixed knife is blunt. Fixed knife blade 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. Movalbe knife position is incorrect. Shuttle race thread guide position Needle bar lift amount Skipped stitches at sewing end Movable knife position Sub-tension is too weak Sub-tension Thread jamming. Thread take-up spring tension and height are incorrect. Incorrect needle and rotary hook timing. Shuttle race thread guide is not separating the threads. Thread take up spring tension and height Needle bar lift amount Shuttle race thread guide position Poor seam finish on reverse side of material. Shuttle race thread guide is not separating the therads. incorrect. Upper thread is not properly tight. Uneven upper thread length. Shuttle race thread guide position Upper thread tension Upper thread length ■ Sharpen or replace the fixed knife. Adjust the position of the shuttle race thread 33 guide. Adjust the needle bar lift amount. Refer to "Skipped stitches occur". 32 Iry Adjust the position of the movable knife. 34 Turn the sub-tension nut to adjust the tension. 13 Adjust the tension and height of the thread takeup spring. 13 Adjust the needle bar lift amount 32 Adjust the position of the shuttle race thread 33 guide. Adjust the position of the shuttle race thread 33 gudie. Adjust the upper thread tension. 13 Adjust the sub-tension. 12 Incorrect thread tightness. Upper thread tension is too weak. Lower thread tension is too weak. Thread take-up spring tension and height are incorrect. Upper thread tension Lower thread tension Thread take-up spring tension and height Adjust the upper thread tension. 13 Adjust the lower thread tension. 13 Adjust the tension and height of the thread 13 take-up spring. BAS-341E • 342E 56