Brother International KE-436C Instruction Manual - English - Page 70

15. TROUBLESHOOTING Problem Cause Check Remedy Upper thread breaks. Upper thread tension is too strong. Upper thread tension Adjust the upper thread tension. Needle is installed incorrectly. Needle direction Install the needle correctly. Thread is too thick for the needle. Thread and needle Use the correct thread for the needle. Thread take-up spring tension and height are incorrect. Damaged or burred rotary hook, needle hole plate or needle. Thread take-up spring tension and height Damage or burring Adjust the tension and height of the thread takeup spring. File smooth or replace the affected part. Thread melting (synthetic thread) Thread edge Use a thread cooling device (optional). Lower thread breaks. Lower thread tension is too strong. Lower thread tension Adjust the lower thread tension. Skipped stitches occur. Corners of needle hole plate or bobbin care are damaged. Clearance between needle and rotary hook tip is too great. Damage Needle clearance File smooth or replace the affected part. Adjust the needle clearance Incorrect needle rotary hook timing. and Needle bar lift amount Adjust the needle bar lift amount. Driver is contacting needle more than is necessary. Clearance between driver and needle Adjust the driver needle guard. Needle is bent. Bent needle Replace the needle. Page 32 29 29 33 66 32 40 39 40 Needle breaks. Needle is installed incorrectly. Needle direction Install the needle correctly. 29 Needle clearance Needle is touching the Adjust the needle clearance. 40 rotary hook. Needle bar lift amount. Adjust the needle bar lift amount. 39 Needle is bent. Bent needle Replace the needle. Needle is too thin. Needle and thread Use the correct needle for the material. KE-436C 64