Brother Innov-is NX600, Руководство по обслуживанию

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6 - 4
Repair Manual
11 Even if the drop
lever is returned to
the left, the feed
dog stays down
and does not return
(no material feed)
Drop knob damage Replace drop knob (3-61) Drop function With the needle bar in
the top position and the
drop lever to the right,
check that the feed dog
is down, and moving
the drop lever to the left
and turning the pulley
one turn by hand, that
the feed dog returns to
the original height.
Malfunction of vertical rod seat Readjust vertical rod seat
operation
(3-67)
Bad vertical drop shaft Replace vertical adjusting screw
(3-68)
Vertical drop shaft misalignment Readjust vertical adjusting
screw
(3-68)
12 Bad pattern shape
Blocked by satin
pattern
Fine BH stitches
Straight line feed
too small
Stitches uneven
Vertical rattle in feed dog
Loose feed dog attachment
screw Readjust feed dog attachment
screw
(4-26)
Back/front rattle
in feed dog With the feed dog up,
check that there is no
rattle when the feed
dog is lightly moved
back and forth.
(4-27)
Vertical rattle in feed bar Reattach the feed bar (3-69)
Damage to horizontal feed cam Replace lower shaft B assy. (3-
67)
Fork end spring slippage Assemble spring (3-67)
Rattle in feed adjuster assy. Reattach the feed adjuster
assy.
(3-62)
Horizontal rattle in feed dog
Loose feed dog attachment
screw Readjust feed dog attachment
screw
(4-26)
Left-right rattle in
feed dog With the feed dog up,
check that there is no
rattle when the feed
dog is lightly moved left
and right.
(4-27)
Horizontal rattle in feed bar Reattach the feed bar (3-73)
Bad feed dog height adjustment Adjust feed dog height (4-27) Feed dog height With the feed dog in the
highest position, check
that the feed dog
comes out 0.9 – 1.1
mm from the top of
needle plate A at the
center of the needle
plate A needle hole.
(4-
27)
Bad feed dog front-back position
adjustment Adjust feed dog front-back
position
(4-26)
Feed dog front-
back position Rotating the pulley by
hand in a 0 mm feed
position (test mode 3)
with the feed dog
aligned with needle
plate A, check that the
gap between the
middle tooth and the
needle plate is 3.3 – 3.9
mm.
(4-26)
Bad feed dog left-right position
adjustment Adjust feed dog left-right
position
(4-26)
Feed dog left-
right position Confirm that the feed
dog has a 0.5 – 0.7 mm
gap left and right
parallel to the needle
plate A needle hole.
(4-
26)
Lateral feed bar operation
incorrect. Reattach the feed bar.
Replace feed module. Left and right
feed dog position Select "side feed line"
from the patterns, and
check that the left and
right feed dog position
is uniform with respect
to the needle when the
pulley is turned by hand
and the feed dog
moved to the left and
right.
Problem Primary factors and causes Repair method Items for
Inspection
Inspection method
and standards