Brother International DA-9270 Instruction Manual - English - Page 26

10. TROUBLESHOOTING 10. TROUBLESHOOTING ¡ Please check the following points before calling for repairs or service. ¡ If the following suggestions do not solve the problem, turn off the machine power supply and contact your nearest Brother service center. CAUTION ¡ Turn off the power supply before adjusting the stitch length, otherwise the machine will operate if the treadle is pressed by mistake, which could result in injury. However, the motor will keep turning even after the power is switched off as a result of the motor's inertia. Wait until the motor stops fully before starting work. Problem Possible cause 1. Upper thread is not tight. ¡ Is the upper thread tension too weak, or is the lower thread tension too strong? Adjust the upper thread tension or lower thread tension. ¡ Is the position of the upper thread take-up thread guide incorrect? Adjust the upper thread take-up thread guide position correctly. 2. Skipped stitches occur while sewing ¡ Is the needle properly installed? If it is incorrect, install the needle correctly. ¡ Are the looper points dull? Replace loopers with good ones. ¡ Is the needle and looper timing incorrect? Adjust the needle and looper timing correctly. ¡ Is the clearance between needles and loopers incorrect? Adjust the clearance between needles and loopers correctly. ¡ Is the lower thread take-up timing incorrect? Adjust the lower thread take-up timing correctly. 3. Seam position is incorrect. (Machines with puller) ¡ Is the puller timing incorrect? Adjust the puller timing. ¡ Is the puller feed incorrect? Adjust the puller feed. ¡ Is the presser foot pressure incorrect? Adjust the presser foot pressure. ¡ Is the feed dog height incorrect? Adjust the feed dog height. 4. Machine does not feed work. ¡ Is the feed dog too low? Adjust the feed dog height. ¡ Is the presser foot pressure too small? Adjust the presser foot pressure. ¡ Is the feed dog worn out? Have serviceman check it. ¡ Presser foot floats and does not fully press work. Have serviceman check it. ¡ Feed dog and presser foot work on one side only. 5. Upper and lower threads are breaking. ¡ 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 thread release shaft position incorrect? Adjust the thread release shaft position 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. Page 11 19 8 16 16 17 19 20 12 11 18 18 11 - - - 8 8 9 11 19 8 16 21 DA-9270