Upper Thread Run Out - Brother HE-800A User Manual

16. TROUBLESHOOTING
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. Upper thread run out

Cause
Upper thread Installation
trimmer assembly upper
assembly
Upper
assembly holding force
Opening cam position
Tension release End of tension release at
timing the beginning of sewing
Opening
zigzag tension discs and
bar tack tension discs
99
Check
position of Adjust the installation position of upper thread
thread trimmer trimmer assembly by moving the setting plate
assembly.
Upper
adjustment
Upper thread trimmer cutting depth adjustment
thread trimmer 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.
Adjust the position so that the scissors do not touch
the opening cam when the work clamp is lowered.
Use parameter number 63 to retard the tension
release timing.
amount of
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.
HE-800A
Remedy
thread trimmer longitudinal
Cotton yarn #60
Holding force approx. 2N
0.5 mm
Zigzag tension Tack tension
0.5 - 1 mm
Page
position
Service
manual
4005Q
-
4006Q
76
4107M
44
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4008Q