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Upper Thread Miss-trimming - Brother HE-800B Service Manual

Electronic direct drive lockstitch button holer.
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11. TROUBLESHOOTING

11-15. Upper thread miss-trimming

Items with a "*" in the "Page" column should only be handled by a qualified technician.
Cause
Upper thread trimmer
assembly
Trimmer driving arm
159
Check
Installation
position
upper
thread
trimmer
assembly
Upper
thread
trimmer
assembly holding force
Upper
thread
trimmer
cutting depth
of
Adjust the installation position of upper thread trimmer
assembly by moving the setting plate assembly.
・ Upper
thread
adjustment
・Upper thread trimmer cutting depth adjustment
Adjust so that the thread does not come out when you
cut it with trimmer and hold the end of the thread
between your fingers and gently swing the assembly.
・Bend the trimmer U or replace them so that the
correct force is applied.
・Repair any damage from striking the needle.
Adjust the position of the trimmer driving arm roller.
HE-800B
Remedy
trimmer
longitudinal
Cotton yarn #60
Holding force approx. 2N
Page
position
98, 99
4005Q
4006Q
99

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Troubleshooting

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