Brother Innov-is NX600, Руководство по обслуживанию

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6 - 3
Repa
ir
Manual
Repair Manual
8 Stitch skipping,
thread abrasion
Thread breakage Bad needle interference
adjustment Adjust needle interference (4-12) Needle and tip
gap Lightly press the lower
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.
(4-12)
Loose needle interference
adjustment screw Adjust needle interference (4-12)
Bad front-back needle drop
adjustment Adjust needle interference (4-12)
Adjust left-right needle
interference
Back-front needle
drop position Turn the pulley by
hand, and confirm that
there is a gap with the
needle before and after
the needle plate A
needle hole.
Bad needle plate attachment
position Reattach the needle plate
Bad needle bar rise adjustment Adjust needle bar rise (4-8) Needle bar rise With a 2.9 – 3.3 mm
rise from the lowest
point for the needle,
confirm that the tip of
the rotary hook comes
to the left side of the
needle.
(4-8) (make
reference mark on
needle bar supporter
assy. )
Loose timing adjustment screws Adjust needle interference (4-12) Needle
interference
Stitch skipping,
thread abrasion
Thread breakage Bad needle bar height
adjustment Adjust needle bar height (4-9) Needle bar
height When the needle and
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.
(4-9)
Loose timing adjustment screws Adjust needle bar height (4-9)
9 Does not turn
(Electronic sounds
and operating
display lamps
normal at startup) Bad main motor Replace main motor (3-27) Sewing machine
runs when S/S
button is pushed Check that the sewing
machine starts and
stops when the S/S
button is pushed when
green.
Main motor connector
disconnection Plug connector in
Bad power supply unit F Replace power supply unit F (3-
29)
Bad SS-VR F PCB assy. Replace SS-VR F PCB assy. (3-
35)
SS-VR F PCB assy. and
operation F3 PCB assy.
connector disconnected Plug connector in
Does not turn
(No electronic
sounds / operating
display lamps
normal at startup) Bad NP PCB assy. Replace NP PCB assy. (3-25)
NP PCB assy. and main PCB
assy. connector disconnected Plug connector in
Bad pin jack assy. Replace pin jack assy. (2-10)
10 Irregular rotation
(rotation slow / fast
/ unstable)
Grease or dust adhering to
speed sensor Remove grease or dust Machine
operation while
rotating Check that it switches
to fast, middle and slow
speed when the speed
control lever is
operated and that at
high speed there is no
rotational variation.
Grease or dust adhering to NP
PCB assy. Remove grease or dust
Bad NP PCB assy. Replace NP PCB assy. (3-25)
Interference between speed
sensor and NP PCB assy. Eliminate cause of interference
• Damage to speed sensor • Replace upper shaft
assy. (3-5)
• NP PCB assy. damage • Replace NP PCB assy. (3-
25)
Bad main PCB assy. Replace main PCB assy. (3-25)
Problem Primary factors and causes Repair method Items for
Inspection
Inspection method
and standards