Brother Innov-is NX600, Руководство по обслуживанию

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6 - 8
Repair Manual
16 • Seam
unevenness
Seam unevenness. Check that stitches are
not uneven during
actual sewing.
• Bad presser position Readjustment of presser bar
height
(4-13)
• Cloth presser is high and
does not hold material
completely
Readjustment of presser bar
height
(4-13)
• Inner rotary hook scratches Replace inner rotary hook
• Outer rotary hook scratches Replace outer rotary hook (3-70)
• Scratches around needle
plate needle hole
Replace needle plate A (3-73)
• Scratches around presser
foot needle hole
Replace presser
• Burrs and scratches in
thread guide path
Replace parts with burrs and
scratches
• Slippage from lower thread
tension spring
Reset lower thread
• Tension loosened by thread
scraps and dirt adhering to
the thread guide plate
Remove thread and dust on
stuck to thread guide plate
• Bad thread guide plate
shape (bent)
Replace thread guide plate (3-
20)
• Needle plate scratches Replace needle plate A (3-73)
Bad presser dial position Replace needle-presser module
(3-4)
Operation of
presser bar Check that presser bar
pressure is effective
when presser dial is set
to 1 and lower presser
foot lifter slowly. (Check
that there's some
resistance when lower
feed dog and insert a
paper between needle
plate and presser foot,
and then pull the paper
out of them.)
(4-13)
• Stops during
sewing
Stops during sewing. Check that it does not
stop during actual
sewing.
• No gap for bobbin winder
switch
Readjust BW switch assy.
position
(3-14)
• No gap for BH lever switch Adjust BH lever switch position
(4-19)
• No play in S/S button,
reverse button or vertical
stop button
Reassemble SS-VR F PCB
assy.
(3-35)
17 BH lever LED
lights.
BH lever LED lights, and it
cannot start. BH lever switch
position function With the BH pattern
selected and the BH
lever switch down, and
when straight line is
selected and the BH
lever switch is up,
confirm that the S/S
button shines green.
• Because of BH lever switch
deformation, the switch is
usually on
Replace BH switch assy. (3-59)
• BH lever switch lead
insulation is torn, and it is
shorting with metal parts
Replace BH switch assy. (3-59)
When started, BH lever LED
lights.
• BH connector disconnected Plug connector in
• BH lever switch bent Replace BH switch assy. (3-59)
• BH lever switch guide
broken / switch displaced
Replace BH switch assy. (3-59)
Problem Primary factors and causes Repair method Items for
Inspection
Inspection method
and standards