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Brother NV-10A Service Manual Page 190

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Repair Manual
Problem
Primary factors and causes
8
Even if the drop
Drop knob damage
knob is returned to
Operation trouble of virtical lever Adjust vertical lever operation
the left, the feed
dog stays down
Bad vertical adjuster screw assy. Replace vertical adjuster screw
and does not return
(no material feed)
Vertical rod misalignment
Vertical feed cam surface out of
grease
9
Bad pattern shape
Vertical rattle in feed dog
Blocked by satin
Loose feed dog attachment
pattern
screw
Fine BH stitches
Vertical rattle in feed bar
Straight line feed
too small
Damage to horizontal feed cam
Stitches uneven
Rattle in feed adjuster assy.
Horizontal rattle in feed dog
Loose feed dog attachment
screw
Horizontal rattle in feed bar
Bad feed dog height adjustment
Bad feed dog front-back position
adjustment
Bad feed dog left-right position
adjustment
Bad feed adjustment
6 - 4
Repair method
Replace drop knob
(2-49) (3-61)
(2-49) (3-61)
assy.
(2-48) (3-61)
Adjust vertical adjuster screw
assy.
(2-48) (3-61)
Apply grease
(3-61)
Adjust feed dog attachment
screw
(4-21)
Reattach feed bar
(2-48) (3-62)
Replace lower shaft assy.
(2-52) (3-57)
Reattach feed adjuster assy.
(2-53) (3-55)
Adjust feed dog attachment
screw
(4-21)
Reattach feed bar
(2-48) (3-62)
Adjust feed dog height
(4-22)
Adjust feed dog front-back
position
(4-21)
Adjust feed dog left-right
position
(4-21)
Adjust feed
(4-17)
Items for
Inspection method
Inspection
and standards
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.
Back/front rattle
With the feed dog up,
in feed dog
check that there is no
rattle when the feed
dog is lightly moved
back and forth.
Left-right rattle in
With the feed dog up,
feed dog
check that there is no
rattle when the feed
dog is lightly moved left
and right.
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.
(4-22)
Feed dog front-
Rotating the pulley by
back position
hand in a 0 mm feed
position (test mode 8)
with the feed dog
aligned with needle
plate A, check that the
gap between the
middle tooth and the
needle plate is 3.2 – 3.8
mm.
(4-21)
Feed dog left-
Confirm that the feed
right position
dog has a 0.3 – 0.7 mm
gap left and right
parallel to the needle
plate A needle hole.
(4-21)
Feed
Check that the
difference in forward
and reverse feed is
within 5 mm in the feed
forward/reverse
adjustment.
(4-17)

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