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Brother NV-10A Service Manual Page 194

Computerized sewing machine.
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Repair Manual
Problem
Primary factors and causes
13
• Seam
Seam unevenness.
unevenness
• Bad presser position
• Cloth presser is high and
• Scratches on inner rotary
• Scratches on outer rotary
• Scratches around needle
• Scratches around presser
• Burrs and scratches in
• Slippage from lower thread
• Tension loosened by thread
• Distortion of thread guide
• Scratches on needle plate
• Stops during
Stops during sewing.
sewing
• No gap for bobbin winder
• No gap for BH lever switch
• No play in S/S button,
14 Cannot sew BH
BH sewing impossible
• BH is blocked
• Bad BH connecting point
• BH cannot
switch
• BH lever detached
• BH switches
part way
• Connector disconnected
through
• Operation drags
• BH presser button
Becomes straight
Bad feed forward/reverse
line
adjustment (100 stitches forward
and reverse)
6 - 8
does not hold material
completely
hook
hook
plate needle hole
foot needle hole
thread guide path
tension spring
scraps and dirt adhering to
the thread guide plate
plate
switch
reverse button or vertical
stop button
attachment holder is pulled
out fully.
Repair method
Adjust presser bar height
(4-15)
Adjust presser bar height
(4-15)
Replace inner rotary hook
Replace outer rotary hook
(2-46) (3-65)
Replace needle plate A
(2-45) (3-66)
Replace presser
Replace parts with burrs and
scratches
Reset lower thread
Remove thread and dust on
stuck to thread guide plate
Replace thread guide plate
(2-14) (3-31)
Replace needle plate A
(2-45) (3-66)
Adjust BW switch assy. position
(4-19)
Adjust BH lever switch position
(4-20)
Reassemble SSVR PCB assy.
(2-7) (3-38)
Adjust BH switch
(4-20)
Replace BH switch assy.
(2-36) (3-53)
Plug connector in
Replace BH switch assy.
(2-36) (3-53)
Reset range for BH presser
button attachment (Move back
two marks from maximum
permissible range)
Adjust feed forward/reverse
(4-17)
Items for
Inspection method
Inspection
and standards
Actual sewing
Check that stitches are
(straight line /
not uneven during
zigzag)
actual sewing.
Actual sewing
Check that it does not
(straight line /
stop during actual
zigzag)
sewing.
Bar-tack
Check that there is no
Eyelet sewing
stitch skipping or
clogging with BH
pattern sewing.
With the BH presser
moved the extent of its
range by hand, confirm
that there is slack on
the BH side and the
other side.
(4-20)

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