Brother International LK3-B430 Instruction Manual - Page 41

Trouble, Cause, Check, point, Remedy

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Trouble Thread not trimmed Thread ensnared Thread tension poor Preeser does not rise Clutch does not engage, and bar tacking cycle is repeated Cause Check point Remedy Page Fixed blade is blunt. Edge of fixed blade. Sharpen or replace fixed 24 blade. Thread trimmer lever spring tension weak and therefore moving blade does not move completely to end. Tension of thread trimmer lever spring. Replace thread trimmer lever spring. Moving blade does not Position of shuttle race scoop up upper thread. - thread guide. Install guide in straight line with shuttle race body. 27 Because final stitch is skipped, moving blade does not scoop up upper thread. Skipping of final stitch. See paragraph "Skipped stitches" for prevention of 36 same. Position of moving blade faulty. Position of moving blade. Adjust position of moving blade. 32 Thread take-up spring too Tension of thread take-up weak. spring. Adjust tension and height of thread take-up spring. 22 Poor contact between needle and shuttle hook. Needle bar stroke. - Adjust stroke of needle bar. 25 Shuttle race thread guide Position of shuttle race does not separate thread. thread guide. Install guide in straight line with shuttle race body. 27 Upper thread tension too weak. Upper thread tension. Adjust to appropriate tension. 22 Thread take-up lever stroke Stroke of thread take-up too large. lever. Adjust stroke of thread take-up lever. 29 Lower thread tension too weak. Lower thread tension. Adjust to appropriate ten- 21 sion. Presser lifter torque insufficient. Tension of low speed belt. Adjust tension of low speed belt. 8 Brake tension spring ten- Tension of brake tension Adjust tension of brake 27 sion too great. spring. tension spring. Motor is in reverse. Rotational direction of motor. Set motor in normal rotation. 9 Insufficient oil on ,ball presser plate. Ball presser plate oil. Lubricate ball presser plate. 12 Clutch lever spring tension Tension of clutch lever too weak. spring. Move clutch lever spring to second position. - 37 -

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Trouble
Thread
not
trimmed
Cause
Fixed
blade
is
blunt.
Thread
trimmer
lever
spring
tension
weak
and
therefore
moving
blade
does
not
move
completely
to
end.
Thread
ensnared
Moving
blade
does
not
scoop
up
upper
thread.
Check
point
Edge
of
fixed
blade.
Tension
of
thread
trimmer
lever
spring.
Position
of
shuttle
race
—
thread
guide.
Because
final
stitch
is
skipped,
moving
blade
does
not
scoop
up
upper
thread.
Position
of
moving
blade
faulty.
Thread
take-up
spring
too
weak.
Thread
tension
poor
Poor
contact
between
needle
and
shuttle
hook.
Shuttle
race
thread
guide
does
not
separate
thread.
Upper
thread
tension
too
weak.
Preeser
does
not
rise
Thread
take-up
lever
stroke
too
large.
Lower
thread
tension
too
weak.
Clutch
does
not
engage,
and
bar
tacking
cycle
is
repeated
Presser
lifter
torque
insuf-
ficient.
Brake
tension
spring
ten-
sion
too
great.
Motor
is
in
reverse.
Insufficient
oil
on
,ball
presser
plate.
Clutch
lever
spring
tension
too
weak.
Skipping
of
final
stitch.
Position
of
moving
blade.
Tension
of
thread
take-up
spring.
Needle
bar
stroke.
Position
of
shuttle
race
thread
guide.
Remedy
Page
Sharpen
or
replace
fixed
24
blade.
Replace
thread
trimmer
lever
spring.
Install
guide
in
straight
line
with
shuttle
race
body.
27
See
paragraph
"Skipped
stitches"
for
prevention
of
same.
36
Adjust
position
of
moving
blade.
32
Adjust
tension
and
height
of
thread
take-up
spring.
22
—
Adjust
stroke
of
needle
bar.
25
Upper
thread
tension.
Stroke
of
thread
take-up
lever.
Lower
thread
tension.
Tension
of
low
speed
belt.
Tension
of
brake
tension
spring.
Rotational
direction
of
motor.
Ball
presser
plate
oil.
Tension
of
clutch
lever
spring.
Install
guide
in
straight
line
with
shuttle
race
body.
27
Adjust
to
appropriate
ten-
sion.
22
Adjust
stroke
of
thread
take-up
lever.
29
Adjust
to
appropriate
ten-
sion.
21
Adjust
tension
of
low
speed
belt.
8
Adjust
tension
of
brake
27
tension
spring.
Set
motor
in
normal
rota-
tion.
9
Lubricate
ball
presser
plate.
12
Move
clutch
lever
spring
to
second
position.
-
37
-