Brother International DA-9280 Instruction Manual - English - Page 29

12. TROUBLESHOOTING Problem 6. Upper and lower threads are breaking. 7. Broken needles Possible cause ¡ Is the needle bent or is the needle tip broken? Replace the needle if it is bent or broken. ¡ Is the needle properly installed? If it is incorrect, install the needle correctly. ¡ Is the needle properly threaded? If it is incorrect thread the needle correctly. ¡ Is the upper or lower thread tension too weak or too strong? Adjust the upper thread or lower thread tension. ¡ Is the tension plate clearance of the upper thread nipper incorrect? Adjust the tension plate clearance of the upper thread nipper correctly. ¡ Are the needle eyes too small for threads? Refer to the section on "Needles and threads". ¡ Are the loopers damaged? Replace loopers with good ones. ¡ Is the material being pushed or pulled with excessive force during sewing? ¡ Is the needle properly installed? If it is incorrect, install the needle correctly. ¡ Is the needle bent, is the needle tip broken, or is the needle hole blocked? If the loopers are damaged, smooth it with an oiled grindstone or replace it. ¡ Does the needles hit the loopers? Adjust timing of loopers running clear of needles. ¡ Does the needles hit the needle guard? Adjust the needle guard. ¡ Are the needle eyes too small for threads? Refer to the section on "Needles and threads". Caution ¡ It is extremely dangerous to leave any pieces of broken needle sticking in the material. If the needle breaks, search for all pieces until the whole of the needle is found again. ¡ Furthermore, we recommend that through steps be taken to account for such needles to comply with product liability regulations. Page 8 8 9 11 19 8 16 - 8 8 17 17 8 24 DA-9280