Brother International HE-800B Instruction Manual - English - Page 89
Uneven seams (1) …… At the sewing start, Bobbin holder spring
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11. TROUBLESHOOTING 11-3. Uneven seams (1) ...... At the sewing start Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Upper thread trimmer Installation height Adjust the upper thread trimmer installation height. Upper thread trimmer Adjust to an appropriate opening timing. opening timing Upper thread trimmer Apply grease to the inclined face of the opening cam. operation Upper thread feeding Thread take-up amount Loosen the screw to decrease thread take-up amount so that upper thread does not pull out of trimmer assembly at the sewing start. Page 68* 69* 69* Screw Decrease Increase * Lower thread (bobbin Lower thread tension slip) Bobbin holder spring 4000Q Adjust the lower thread tension appropriately. 26 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 Lower thread position 4001Q retainer Adjust the lower thread retainer position. * Adjust lower thread retainer so that a 35 - 40 mm thread leader is left after trimming. * 35 - 40mm Bobbin presser position Bobbin insertion Adjust the bobbin presser position. Insert the bobbin correctly. 4002Q 70* 25 HE-800B 80