Brother International HE-800A Instruction Manual - English - Page 109

Unraveling of thread trimmed by upper thread trimmer assembly - 2 service manual

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16. TROUBLESHOOTING Unraveling of thread trimmed by upper thread trimmer assembly Cause Upper thread trimmer assembly Check Installation position of upper thread trimmer assembly Remedy Adjust the installation position of upper thread trimmer assembly by moving the setting plate assembly. ࡮Upper thread trimmer longitudinal position adjust- ment ࡮Upper thread trimmer cutting depth adjustment Page Service manual 4005Q Burr on tips of upper thread trimmer M and upper thread trimmer U. Polish with buff or replace the part. Check burr on upper side here Check burr here - Tension timing release 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. - Work clamp Zigzag tension Tack tension 0.5 - 1 mm 4008Q Work clamp lifting speed Use memory switch No. 02 to retard the work clamp lifting speed. 79 101 HE-800A

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HE-800A
16. TROUBLESHOOTING
101
１６
-
１４
. Unraveling of thread trimmed by upper thread trimmer assembly
Cause
Check
Remedy
Page
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 adjust-
ment
Upper thread trimmer cutting depth adjustment
Service
manual
Upper thread trimmer
assembly
Burr on tips of upper
thread trimmer M and
upper thread trimmer U.
Polish with buff or replace the part.
-
Tension
release
timing
Opening
amount
of
zigzag tension discs and
bar tack tension discs
(particularly
zigzag
tension discs)
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.
-
Work clamp
Work clamp lifting speed
Use memory switch No. 02 to retard the work clamp
lifting speed.
79
4009Q
4005Q
Check burr on upper
side here
Check burr here
4008Q
Tack tension
0.5 - 1 mm
Zigzag tension