Brother NX600 Service Manual page 208

Repair Manual
Problem Primary factors and causes
13 • Needle Noise of contact between needle
contact noise and outer rotary hook
• Bad needle interference
• Loose needle interference
• Release Needle bar hook stand coming
sound off
• Needle bar hook stand
• Release lever bent
14 Threading not Thread pushed out at the hook
possible. end.
• Vertical slippage in needle
Hook extends right of the needle
hole
• Wide gab between right side
• Needle curvature
• Needle slant (hole slant with
• Threader hook assy.
• Vertical slippage in needle
Does not go into needle hole
because of hook tip curvature.
Threading impossible even
though hook goes into needle
hole.
• Thread lost from hook guard
• Because of bad hook spring
• Hook spring operation is
• Thread lost from threader
When the threader Threader shaft tangling
lever returns, it
stops part way
Bad thread guide shape
through.
Hook guide and hook release
plate touch
Bad needle thread lever shaft
shape
Needle thread shaft and top gap
too small
6 - 6
adjustment
adjustment screw
damaged
thread block
of needle and hook guide
slanted attachment of
needle block)
slippage
thread block
B
shape, the thread is pushed
out at the hook tip
tight, so the thread cannot
be held and the thread is
pulled from the needle hole
again.
disk
Repair method
Adjust needle interference(4-12)
Adjust needle interference(4-12)
Replace needle bar hook stand
Replace release lever
Readjust the needle thread
block(4-29)
Replace hook assy. (3-49)
Needle replacement
Replace needle bar (3-54)
Replace hook assy. (3-49)
Readjust the needle thread
block(4-29)
Replace hook assy. (3-49)
Replace hook assy. (3-49)
Replace hook assy. (3-49)
Replace hook assy. (3-49)
Replace needle bar supporter
assy. (3-51)
Replace needle bar supporter
assy. (3-51)
Replace hook assy. (3-49)
Replace hook assy. (3-49)
Replace lever guide shaft (3-51)
Replace needle bar supporter
assy. (3-51)
Items for Inspection method
Inspection and standards
Threading Confirm that when
function threading is carried out
with Schappe Spun
Sewing Thread #60 /
#11 needle and
Schappe Spun Sewing
Thread #30 / #16
needle, that the
threading lever moves
smoothly and that
threading through the
needle hole is possible.