Brother International KE-436C Instruction Manual - English - Page 71

15. TROUBLESHOOTING Problem Cause Check Remedy Upper thread is not trimmed. Movable knife is bent. Movable knife blade Replace the movable knife. Fixed knife is blunt. Fixed knife blade Sharpen or replace the fixed knife. Movable knife dose not pick up the thread. Shuttle race thread guide position Needle bar lift amount Adjust the position of the shuttle race thread guide. Adjust the needle bar lift amount. The movable knife does not pick up the thread because of skipped stitches at the sewing end. Skipped stitches at sewing end Refer to "Skipped stitches occur". Movable knife position is incorrect. Movable knife position Adjust the position of the movable knife. Sub-tension is too weak. Sub-tension Turn the sub-tension nut to adjust the tension. Thread jamming. Thread take-up spring tension and height are incorrect. Thread take-up tension and height spring Adjust the tension and height of the thread takeup spring. Incorrect needle rotary hook timing. and Needle bar lift amount Adjust the needle bar lift amount. Poor seam finish on reverse side of material. Shuttle race thread guide is not separating the threads. Shuttle race thread guide is separating the threads insufficiently. Upper thread is not properly tight. Shuttle race thread guide position Shuttle race thread guide position Upper thread tension Adjust the position of the shuttle race thread guide. Adjust the position of the shuttle race thread guide. Adjust the upper thread tension. Uneven length. upper thread Upper thread length Adjust the sub-tension. Upper thread is too long. Thread stroke take-up lever Adjust the thread take-up lever stroke. Incorrect thread tightness. Upper thread tension is too weak. Upper thread tension Adjust the upper thread tension. Lower thread tension is too weak. Lower thread tension Adjust the lower thread tension. Thread take-up spring tension and height are incorrect. Thread take-up tension and height spring Adjust the tension and height of the thread takeup spring. Machine does not operate when power is turned on and foot switch is depressed. Head position does not work. Head position switch cord Check if the cord is connection disconnected. switch Switching plate position Adjust the position of the switching plate. Head position switch is Replace the head posi- broken. tion switch. Page 43 43 40 39 64 42 32 33 39 40 40 32 32 41 32 32 33 9, 10 6 65 KE-436C