Brother International LK3-B432E MKII Instruction Manual - English - Page 69

16. TROUBLESHOOTING Problem Cause Check Remedy Page Upper thread breaks. Upper thread tension is too strong. Upper thread tension Needle is installed incorrectly. Needle direction Thread is too thick for the needle. Thread take-up spring tension and height are incorrect. Damaged or burred rotary hook, needle hole plate or needle. Thread melting (synthetic thread) Thread and needle Thread take-up spring tension and height Damage or burring Thread edge Adjust the upper thread tension. 26 Install the needle so that the groove is 23 facing forward. Use the correct thread for the needle. 23 Adjust the tension and height of the 27 thread take-up spring. File smooth or replace the afffected part. Use a thread cooling device (optional). 65 Lower thread tension is too strong. Lower thread tension Adjust the lower thread tension. 26 Lower thread breaks. Corners of needle hole plate or bobbin care are damaged. Damage File smooth or replace the affected part. Skipped stitches occur. Clearance between needle and rotary hook tip is too great. Incorrect needle and rotary hook timing. Driver is contacting needle more than is necessary. Needle clearance Needle bar lift amount Clearance between driver and needle Adjust the needle clearance. 33 Adjust the needle bar lift amount. 32 Adjust the driver needle guard. 33 Needle is bent. Bent needle Replace the needle. Needle is installed incorrectly. Needle direction Install the needle so that the groove is 23 facing forward. Needle breaks. Needle is touching the rotary hook. Needle is bent. Needle is too thin. Needle clearance Needle bar lift amount. Bent needle Needle and thread Adjust the needle clearance. 33 Adjust the needle bar lift amount. 32 Replace the needle. Use the correct needle for the material. 63 LK3-B430E-, B431E-, B432E-, B433E- Mark II