Brother International HE-800A Instruction Manual - English - Page 107

Upper thread run out - service manual

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16. TROUBLESHOOTING Upper thread run out 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 adjustment ࡮Upper thread trimmer cutting depth adjustment Page Service manual Upper thread trimmer assembly holding force 4005Q Adjust so that the thread does not come out when you cut it with scissors and hold the end of the thread between your fingers and gently swing the assembly. ࡮Bend the scissors U or replace them so that the correct force is applied. ࡮Repair any damage from striking the needle. Cotton yarn #60 - Holding force approx. 2N Opening cam position 4006Q Adjust the position so that the scissors do not touch the opening cam when the work clamp is lowered. 76 0.5 mm 4007Q Tension timing release End of tension release at Use parameter number 63 to retard the tension the beginning of sewing release timing. 44 Opening amount of zigzag tension discs and bar tack 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. - Zigzag tension Tack tension 0.5 - 1 mm 4008Q 99 HE-800A

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HE-800A
16. TROUBLESHOOTING
99
１６
-
１３
. Upper thread run out
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
adjustment
Upper thread trimmer cutting depth adjustment
Service
manual
Upper
thread
trimmer
assembly holding force
Adjust so that the thread does not come out when
you cut it with scissors and hold the end of the
thread between your fingers and gently swing the
assembly.
Bend the scissors U or replace them so that the
correct force is applied.
Repair any damage from striking the needle.
-
Upper thread trimmer
assembly
Opening cam position
Adjust the position so that the scissors do not touch
the opening cam when the work clamp is lowered.
76
End of tension release at
the beginning of sewing
Use parameter number 63 to retard the tension
release timing.
44
Tension
release
timing
Opening
amount
of
zigzag tension discs and
bar tack 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.
-
4006Q
4005Q
4007Q
0.5 mm
Cotton yarn #60
Holding force approx. 2N
4008Q
Tack tension
0.5 - 1 mm
Zigzag tension