Brother International HE-800A Instruction Manual - English - Page 103

16. TROUBLESHOOTING Cause Check Lower thread (bobbin Lower thread tension slip) Bobbin holder spring Remedy Adjust the lower thread tension appropriately. Add tension to the bobbin holder spring. . Add tension to the spring by the same amount that the bobbin tab is projecting Make a gap Page 61 - Lower thread position retainer 4001Q Adjust the lower thread retainer position. * Adjust lower thread retainer so that a 35 - 40 mm thread leader is left after trimming. - 35 - 40mm 4002Q Bobbin presser position Adjust the bobbin presser position. 77 Bobbin insertion Insert the bobbin correctly. 60 Work clamp lifting speed Reduce the setting for memory switch No. 02. 79 １６-４. Uneven seams (2) ...... Lower thread is lifted up at the sewing start The end of the lower thread protrudes above the seam at the sewing start Cause Check Remedy Lower thread retainer Lower thread retaining Adjust the lower thread retaining amount. amount Page - 4003Q Lower thread clamp Lower thread clamp Adjust so that the lower thread clamp plate opens opening timing when the feed mechanism moves 6 - 7 mm. 77 Lower thread clamping ࡮If the lower thread clamp and lower thread presser force are bent, replace them. ࡮Check that the screws are tightened. Screw - Lower thread clamp 3999Q 95 HE-800A