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Brother NV-10A Service Manual Page 189

Computerized sewing machine.
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Repair Manual
Problem
Primary factors and causes
5
Stitch skipping,
Bad needle interference
thread abrasion
adjustment
Thread breakage
Loose needle interference
adjustment screw
Bad front-back needle drop
adjustment
Bad needle plate A attachment
position
Bad needle bar rise adjustment
Loose timing adjustment screws Adjust needle interference
Bad needle bar height
adjustment
Loose timing adjustment screws Adjust needle bar height
6
Does not turn
Bad main motor
(Electronic sounds
and operating
Main motor connector
display lamps
disconnection
normal at startup)
Bad power supply PCB assy.
Bad SSVR PCB assy.
SSVR PCB assy. and operation
PCB assy. connector
disconnected
Does not turn
Bad main PCB assy.
(No electronic
sounds / operating
Bad main PCB assy. attachment
display lamps
position
normal at startup)
Bad pin jack assy.
7
Irregular rotation
Grease or dust adhering to timing
(rotation slow / fast
shutter of upper shaft assy.
/ unstable)
Grease or dust adhering to
speed sensor of main PCB assy.
Bad main PCB assy.
Interference between timing
shutter and speed sensor
• Damage to timing shutter
• Damage to speed sensor
Repair method
Adjust needle interference
(4-10)
Adjust needle interference
(4-10)
Adjust needle interference
(4-10)
Adjust left-right needle
interference
(4-13)
Reattach needle plate A
(2-45) (3-66)
Adjust needle bar rise
(4-11)
(4-10)
Adjust needle bar height
(4-12)
(4-12)
Replace main motor
(2-18) (3-23)
Plug connector in
(3-26)
Replace power supply PCB
assy.
(2-17) (3-25)
Replace SSVR PCB assy.
(2-7) (3-38)
Plug connector in
(3-36)
Replace main PCB assy.
(2-16) (3-26)
Reassemble main PCB assy.
(2-16) (3-26))
Replace pin jack assy.
(2-18) (3-24)
Remove grease or dust
Remove grease or dust
Replace main PCB assy.
(2-16) (3-26)
Eliminate cause of interference
• Replace upper shaft assy.
(2-30) (3-9)
• Replace main PCB assy.
(2-16) (3-26)
Items for
Inspection method
Inspection
and standards
Needle and tip
Lightly press the lower
gap
part (cover part) of the
SS button while running
on the right base line,
and check for the faint
sound of the needle
and tip hitting.
Back-front needle
Turn the pulley by
drop position
hand, and confirm that
there is a gap with the
needle before and after
the needle plate A
needle hole.
(4-9)
Needle bar rise
With a 2.9 – 3.3 mm
rise from the lowest
Needle
point for the needle,
interference
confirm that the tip of
the rotary hook comes
to the left side of the
needle.
(4-10)
Needle bar
When the needle and
height
outside of the bobbin
tip meet when turning
the pulley on the left
base line, confirm that
the distance from the
top of the needle hole
to the bottom of the
rotary hook tip is 1.0 –
1.4 mm.
(4-12)
Sewing machine
Check that the sewing
runs when S/S
machine starts and
button is pushed
stops when the S/S
button is pushed when
green.
Machine
Check that it switches
operation while
to fast, middle and slow
rotating
speed when the speed
control lever is
operated and that at
high speed there is no
rotational variation.
(4-10)
6 - 3

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