Brother International LK3-B430 Service Manual - Page 43

• Trouble • C• ause Check' • . 11\091 , A rnie is blunt. r Thread trimming leser spring pressure is too small for mosable knife to run all way. Fixed knife edge Thread trimming leser spring pressure Remedy • Pap Sharpen fixed knife or replace it. Replace thread trimming, leser spring with a new onc.I ' t pper thread is not cut. --I Shuttle thread guide position _.. Mosable knite does not Ii scoop up upper thread. I- Needle bar storke L \losable knife does not - scoop tipper thread due to Iotal stitch skipping. Final stitch skipping. Adjust shuttle thread guide! /1 position. Ii I I Adjust needle bar stroke. 23 42 Refer to instructions for stitch skipping, and take steps to present it. Mosable knife position is wrong. Movable knife position 32 Adjust mosable knife position. Thread gets caught. ! Sub-tension tightening I timing is wrong. ' L. Sub-tension tension is too I small. Thread take-up spring tension and height are incorrect. h U Shuttle thread guide does not properly guide thread. Sub-tension tightening timing Sub-tension tension Thread take-up spring tension and height Shuttle thread guide position. Adjust sub-tension. 33 Turn tension nut to adjust sub-tension. Adiust thread take-up spring tension and height. 4 i Adjust shuttle thread guide position. Stitches on wrong side of work are not good. (.....1 Thread take-up leser stroke is incorrect. LI Needle read length' is uneven. Thread take-up lever stroke Needle thread length Adjust thread take-up Incr. 33 Adjust sub-tension. 33 I Upper thread tension is too small. Upper thread tension Adjust upper thread tension. Thread tension poor 7 lower thread tension is too small. Lower thread tension 2 Adjust lower thread tension. Thread take-up spring I-, tension and height are incorrect. Thread take-up spring tension and height - 43 - !Adjust thread take-up 11 spring tension and height. 1 I _1