Brother International HE-800B Instruction Manual - English - Page 96
Unraveling of thread trimmed by upper thread trimmer assembly
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11. TROUBLESHOOTING 11-14. Unraveling of thread trimmed by upper thread trimmer assembly Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Upper thread trimmer assembly Installation position of upper thread trimmer assembly Adjust the installation position of upper thread trimmer assembly by moving the setting plate assembly. ・ Upper thread trimmer longitudinal position adjustment ・ Upper thread trimmer cutting depth adjustment Page * 4005Q Burr on tips of upper thread Polish with buff or replace the part. trimmer M and upper thread trimmer U. Check burr on upper side here Check burr here * Tension release timing Opening amount of zigzag tension discs and bar tack tension discs (particularly zigzag tension discs) 4009Q ・ Adjust the zigzag tension discs by moving the tension stud bracket in and out. ・ Adjust the bar tack tension discs opening amount to 0.5 - 1.0 mm by removing the top cover and moving the tension release cam. * Zigzag tension Tack tension 0.5 - 1 mm 4008Q 87 HE-800B