Brother International LK3-B430 Instruction Manual - Page 40

Trouble, shooting

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Trouble shooting Trouble Thread slips out of needle at first stitch Therad breaks Skipped stitches Needle breaks Cause Check point Remedy Page Thread take-up lever stroke Stroke of thread take-up - Adjust stroke of thread take-up lever to suit fabric 29 too small. lever. being sewn. Upper thread tension too Upper thread tension. great. Needle incorrectly installed. Direction of needle. Adjust to appropriate tension. 22 Install needle with long groove facing front. 18 Thread too thick for needle. Needle and thread. See "Selecting a needle and thread". 19 Lower thread tension too great. Lower thread tension. Adjust to appropriate ten- 21 sion. Clearance between needle and tip of shuttle hook too large. Clearance between needle and shuttle hook. Adjust clearance between needle and shuttle hook. 26 Poor contact between needle and shuttle hook. Needle bar stroke. Adjust stroke of needle bar. 25 Needle received too deeply Clearance between shuttle into shuttle driver. driver and needle. Adjust shuttle driver and needle contact. 26 Needle is bent. Bent needle. See "Selecting a needle and thread" and replace needle. 19 Needle incorrectly installed. Direction of needle Install needle with long groove facing front. 18 Needle contacting tip of Clearance between needle shuttle hook. and shuttle hook. Adjust clearance between needle and shuttle hook. 26 Needle is bent. Wayward stitching. Bent needle. dNeedle and feed timing. See "Selecting a needle and 19 thread" and replace needle. Adjust needle and feed timing. 28 - 36 -

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Trouble
shooting
Trouble
Cause
Check
point
Remedy
Page
Thread
slips
out
of
needle
Thread
take-up
lever
stroke
too
small.
Stroke
of
thread
take-up
lever.
—
Adjust
stroke
of
thread
take-up
lever
to
suit
fabric
being
sewn.
29
at
first
stitch
Upper
thread
tension
too
great.
Upper
thread
tension.
Adjust
to
appropriate
ten-
sion.
22
Needle
incorrectly
installed.
Direction
of
needle.
Install
needle
with
long
groove
facing
front.
18
Therad
breaks
Thread
too
thick
for
needle.
Needle
and
thread.
See
"Selecting
a
needle
and
thread".
19
Lower
thread
tension
too
great.
Lower
thread
tension.
Adjust
to
appropriate
ten-
sion.
21
Clearance
between
needle
and
tip
of
shuttle
hook
too
large.
Clearance
between
needle
and
shuttle
hook.
Adjust
clearance
between
needle
and
shuttle
hook.
26
Poor
contact
between
needle
and
shuttle
hook.
Needle
bar
stroke.
Adjust
stroke
of
needle
bar.
25
Skipped
stitches
Needle
received
too
deeply
into
shuttle
driver.
Clearance
between
shuttle
driver
and
needle.
Adjust
shuttle
driver
and
needle
contact.
26
Needle
is
bent.
Bent
needle.
See
"Selecting
a
needle
and
thread"
and
replace
needle.
19
Needle
incorrectly
installed.
Direction
of
needle
Install
needle
with
long
groove
facing
front.
18
Needle
contacting
tip
of
Clearance
between
needle
and
shuttle
hook.
Adjust
clearance
between
needle
and
shuttle
hook.
26
shuttle
hook.
Needle
breaks
Needle
is
bent.
Bent
needle.
See
"Selecting
a
needle
and
thread"
and
replace
needle.
19
d
Needle
and
feed
timing.
Adjust
needle
and
feed
timing.
28
Wayward
stitching.
-
36
-