Brother International T-8752C Instruction Manual - English - Page 85

14. TROUBLESHOOTING Problem Possible cause 3 Skipped stitches occur y Is the needle tip bent? Is the needle tip blunt? while sewing If the needle tip is bent or broken, replace the needle. y Is the needle properly installed? If it is incorrect, install the needle correctly. y Is the machine properly threaded? If it is incorrect, thread the thread correctly. y Is the presser foot pressure too weak? Adjust the presser foot pressure. y Is the needle too thin? Replace the needle with a needle that is one rank thicker. y Is the presser foot too high? Adjust the height of the presser foot. y Is the thread take-up spring too weak? Adjust the tension of the thread take-up spring. y Is the thread take-up amount too large? 2945M Adjust the thread take-up amount. 4 Skipped stitches at sewing y Is the thread take-up spring tension too strong? start Reduce the tension of the thread take-up spring. Thread unravelling at y Is the thread take-up spring operating range too large? sewing start Raise the position of the stopper. y Are the trailing lengths of the upper threads too short after thread trimming? Adjust the pretension. y Are the threads not being trimmed cleanly? Sharpen the fixed knives, or replace the fixed and movable knives if necessary. y Is the needle too wide? Try using a needle with a count that is one lower than the current needle. y Is the sewing speed too fast at the sewing start? Use the slow start feature. y Is the needle up stop position too high? Adjust the needle up stop position. y Is the lower thread pressed by the plate spring (1) after thread trimming? If the lower thread is not pressed by the plate spring (1), adjust the installation position of the movable knife (2). Page 18 20-24 52 68* 66* 54 66* 65* 53 * 34 35 * Lower thread 2947M y If sewing light or medium-weight materials, is a presser foot with slots on the underside or grooved feed dog being used? Use a presser foot without slots. Use a feed dog without grooves. Grooves Slot 2946M T-8421C, 8422C, 8452C, 8722C, 8752C 2944M 76