Brother HS-3000, Руководство по обслуживанию

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6 - 7
Repa
ir
Manual
Repair Manual
12 Utility sewing Utility sewing
(straight line /
zigzag) Check that the needle
does not break during
actual sewing and that
there are no abnormal
sounds during actual
sewing.
• Needle
breakage
Needle contacts outer rotary
hook Adjust clearance between
needle and rotary hook point.
(4-11)
Inner rotary hook release
• Inner rotary hook and inner
rotary hook bracket assy.
horizontal overlap is small
Adjust inner rotary hook bracket
assy. position
(4-20)
• Inner rotary hook and inner
rotary hook bracket assy.
vertical overlap is small
Check the presence or absence
of washer and spacer under the
outer rotary hook shaft
(2-24) (3-34)
Thread catches on spool presser
(scratches on spool presser) Replace spool presser
Needle bends or needle tip
breaks Replace needle
• Thread
breakage
stitch skipping
Bad needle bar rising adjustment Adjust needle bar rising (4-9) Utility sewing
(straight line /
zigzag) Check that the thread
does not break during
actual sewing.
Bad needle bar height
adjustment Adjust needle bar height (4-10)
Thread catches on spool presser
(scratches on spool presser) Replace spool presser
Scratches on outer rotary hook Replace outer rotary hook assy.
(2-24) (3-34)
Miss thread guide pathway Rethread
• Seam
unevenness
Presser foot inclines Adjust presser bar height and
parallelism
(4-13)
Utility sewing
(straight line /
zigzag) Check that stitches are
not uneven during
actual sewing.
Presser foot position is high
(does not hold material
completely) Adjust presser bar height and
parallelism
(4-13)
Scratches on inner rotary hook Replace inner rotary hook
Scratches on outer rotary hook Replace outer rotary hook
(2-24) (3-34)
Scratches around needle plate A
needle hole Replace needle plate A
(2-23) (3-36)
Scratches on needle plate A
surface
Scratches around presser foot
needle hole Replace presser foot
Burrs and scratches in thread
guide pathway Replace parts with burrs and
scratches
Lower thread slippage from
thread tension spring of inner
rotary hook Reset lower thread
• Stops during
sewing
No gap for BH switch lever Adjust BH lever switch position
(4-16)
Utility sewing
(straight line /
zigzag) Check that it does not
stop during actual
sewing.
No play in SS-button, reverse
stitch button or needle position
button Reassemble SSVR PCB assy.
(2-9) (3-18)
Problem Primary factors and causes Repair method Items for
Inspection
Inspection method
and standards