Brother Innov-is NX600, Руководство по обслуживанию

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6 - 7
Repa
ir
Manual
Repair Manual
14 Needle thread
lever operation
catches part way
through.
Bad needle stop position
• NP sensor damage Replace NP PCB assy. (3-25)
• Grease or dirt adhering to
NP sensor
Remove grease and dirt
• Rotation shutter damage Replace upper shaft assy. (3-5)
• Bad needle thread block
rotational position
Adjust the needle thread block
(4-29)
Needle thread
lever knob out of
place Needle thread lever knob
attachment loose Replace needle thread lever
knob
(3-40)
15 Either upper thread
tension or lower
thread tension
Upper thread tension is high/low
(check the screw lock on the
tension disk tension adjustment
screw). Upper thread tension with
Schappe Spun Sewing Thread
#60 is 0.53 - 0.62 N (53 - 62 g)
Insert connector securely Upper thread
tension Check that the thread
tension is good during
actual sewing.
AT pulse motor connector
disconnection Plug connector securely in
Bad AT pulse motor Replace AT pulse motor
Bad main PCB Replace main PCB
Lower thread tension is too
strong / weak
(Check inner rotary hook screw
lock) Lower thread tension with
Schappe Spun Sewing Thread
#60 is 0.1 – 0.12 N (10 – 12 g)
(4-16)
Lower thread
tension
Upper thread or lower thread
unsuitable Replace upper thread or lower
thread
16 Actual sewing
• Needle
breakage
Needle breaks.
Actual sewing
(straight line /
zigzag) Check that the needle
does not break during
actual sewing.
Check that there are no
abnormal sounds
during actual sewing.
• Inner rotary hook slips
because the inner rotary
hook and inner rotary hook
bracket back/front overlap is
too small
Adjust inner rotary hook bracket
assy. position
(4-28)
• Inner rotary hook slips
because the inner rotary
hook and inner rotary hook
bracket vertical overlap is
too small
Adjust inner rotary hook bracket
assy. position
(4-28)
• Thread catches on thread
bobbin
(thread falls down to the
right because the spool
pressure is insufficient)
Rethread
• Thread catches on spool
presser
(scratches on spool presser)
Replace spool presser
Needle catches and bends
before or after sewing. Needle replacement
• Thread
breakage
stitch skipping
Thread breakage. Check that the thread
does not break during
actual sewing.
• Thread catches on thread
bobbin
(thread falls down to the
right because the spool
pressure is insufficient)
Rethread
• Thread catches on spool
presser (scratches)
Replace spool presser
• Outer rotary hook scratches Replace outer rotary hook assy.
(3-70)
• Wrong thread guide path Rethread
Problem Primary factors and causes Repair method Items for
Inspection
Inspection method
and standards