Brother International BM-917B Instruction Manual - English - Page 35

14. TROUBLESHOOTING Problem 18. Button does not drop at the stop position. 19. Machine makes abnormally loud sound when stopping. 20. Machine stops before the stop position. Button clamp lift stroke is too small. Thread is not cut. Possible cause • Does the outer diameter of the button match the opening amount for the button clamp? Set a button in place and adjust the size adjust plate. • Is the button opener adjusted correctly? Adjust the transverse position and vertical position of the button opener. • Is the sewing machine operating speed too fast? Use a machine pulley that matches the frequency. • Is the braking force too weak? Adjust the brake. • Is the sewing machine operating speed too slow? Use a machine pulley that matches the frequency. • Is the braking force too strong? Adjust the brake. Page ・ 12 ・ ・ 21 ・ 3 ・ 20 ・ 3 ・ 20 29 BM-917B, 917C