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Brother NV-10A Service Manual Page 193

Computerized sewing machine.
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Repair Manual
Problem
Primary factors and causes
13 Actual sewing
• Needle
Needle breaks.
breakage
• Inner rotary hook slips
because the inner rotary
hook and inner rotary hook
bracket back/front overlap is
too small
• Inner rotary hook slips
because the inner rotary
hook and inner rotary hook
bracket vertical overlap is
too small
• Thread catches on thread
bobbin
(thread falls down to the
right of thread bobbin
because the spool pressure
is insufficient)
• Thread catches on spool
presser
(scratches on spool presser)
Needle catches and bends
before or after sewing.
• Thread
Thread breakage.
breakage
• Thread catches on thread
stitch skipping
bobbin
(thread falls down to the
right of thread bobbin
because the spool pressure
is insufficient)
• Thread catches on spool
presser (scratches on spool
presser)
• Scratches on outer rotary
hook
• Wrong thread guide path
Repair method
Adjust inner rotary hook bracket
assy. position
(4-23)
Confirm the presence of washer
and spacer under outer rotary
hook
(2-46) (3-65)
Rethread
Replace spool presser
Replace needle
Rethread
Replace spool presser
Replace outer rotary hook assy.
(2-46) (3-65)
Rethread
Items for
Inspection method
Inspection
and standards
Actual sewing
Check that the needle
(straight line /
does not break during
zigzag)
actual sewing.
Check that there are no
abnormal sounds
during actual sewing.
Actual sewing
Check that the thread
(straight line /
does not break during
zigzag)
actual sewing.
6 - 7

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