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Brother NV-10A Service Manual Page 188

Computerized sewing machine.
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Repair Manual
Problem
Primary factors and causes
1
Stitch skipping
Needle tip damaged while
Thread abrasion
sewing
Thread breakage
Needle catches and bends
Seam unevenness
before or after sewing
Needle breaks
2
Power supply does
Inlet connector disconnected
not enter
Bad power supply PCB assy.
Power supply PCB assy. and
main PCB assy. connector
disconnected
Bad main PCB assy.
Main PCB assy. and operation
PCB assy. connector
disconnected
Main PCB assy. and SSVR PCB
assy. connector disconnected
Power supply
Foot controller connector
enter, but safety
disconnected, or broken it
timer does not
Bad pin jack assy.
operate
Bad main PCB assy.
Sewing machine
Bad PCB unit LED lamp-R
lamp (LED lamp)
Broken lead wire of PCB unit
does not light
LED lamp-R
(machine operation
PCB unit LED lamp-R connector
normal)
disconnected
Bad main PCB assy.
Bad SSVR PCB assy.
3
Even when the
Bad presser switch attachment
presser is raised
position
with a straight line
Bad presser switch assy.
pattern, the sewing
machine will not
turn
4
Straight left base
Bad left-right needle drop
line stitch
adjustment
unevenness
Loose zigzag adjusting nut
(pitch)
6 - 2
Repair method
Needle replacement
Plug connector in
Replace power supply PCB
assy.
(2-17) (3-25)
Plug connector in
(3-26)
Replace main PCB assy.
(2-16) (3-26)
Plug connector in
(3-36)
Plug connector in
(3-36)
Plug connector in
Replace foot controller
Replace pin jack
(2-18) (3-24)
Replace main PCB assy
(2-16) (3-26)
Replace PCB unit LED lamp-R
(2-7) (3-38)
Plug connector in
(3-38)
Replace main PCB assy.
(2-16) (3-26)
Replace SSVR PCB assy.
(2-7) (3-38)
Adjust presser switch position
(2-40) (3-47)
Replace presser switch assy.
(2-40) (3-47)
Adjust 3 point needle drop
(4-8)
Adjust 3 point needle drop
(4-8)
Items for
Inspection method
Inspection
and standards
Needle curvature Remove the needle,
place on level block
(horizontal block) and
be sure there is no
curvature.
Tip damage to
Touch the needle tip
needle
with your finger, be
sure that it is not
damaged.
Sewing machine
When power is
runs when
switched ON
switched on
Confirm that there is a
beep, that the
indication lamps and
that the sewing
machine lamp turns on.
Presser switch
Lower presser with
function
straight line pattern,
and check that machine
operation normal
3 point needle
Check that the needle
drop
positions are uniform to
(divide left and
the left and right of the
right)
needle plate A needle
hole.
(4-8)
(4-2)
(4-2)

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