Brother International LK3-B431 MKII Instruction Manual - Page 69

Troubleshooting

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16. TROUBLESHOOTING Problem Cause Check 16. TROUBLESHOOTING Remedy Page Presser does not rise. Work clamp operation is sluggish. Presser lifter amount is too great. Too much friction between presser plate and presser arm lever support. Sliding part of the work clamp lubrication Distance between work clamp and top of needle plate Presser plate and presser arm lever support lubrication __- Grease the sliging part of the work 36 clamp. Adjust the height of the work clamp to within 17 mm. 36 - 37 Grease the presser plate and presser arm 36 lever support. Presser does not drop. Presser is contacting _ Thread wiper standby thread wiper. position _ Presser lifter link is not moving back. Link return spring is unhooked. Adjust the position of the thread wiper. 39 Hook the link return spring properly. z Presser lift amount is incorrect. *2 Work clamp does not close. Thread wiper does not operate correctly. Incorrect position of Distance between presser arm lever - work clamp and top plate. of needle plate Incorrect position of presser closing roller. Whether stop lever is engaged with stop position adjustment bar or not The thread wiper is obstructing the needle. dClearance beween thread wiper and needle tip Thread wiper position is incorrect. Thread wiper position Adjust the work clamp lift amount. 36 - 37 Adjust the position of presser closing roller. 38 Adjust the height of the thread wiper. 39 Adjust the operating distance of the thread 39 wiper. Lower thread winds to one side. Bobbin winder thread tension stud height is incorrect. Bobbin winder thread tension stud height Adjust the height of the thread tension stud. 24 Lower thread winding amount is incorrect. Bobbin presser position is incorrect. Thread winding amount Adjust the position of the bobbin presser. 24 Threads comes unthreaded. Stitches being skipped at the sewing start. Refer to "Skipped stitches occur" Refer to "Skipped stitches occer". Uneven upper thread length. Upper thread length Adjust the subtension. 26 Upper thread is too short. Thread take-up lever stroke Adjust the thread take-up lever stroke. 34 *1 Not applicable for the B432E Mark II. *2 B432E Mark II only. 1K3-B430E-, B431E-, B432E-, 8433E- Mark it 62

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16.
TROUBLESHOOTING
16.
TROUBLESHOOTING
Problem
Presser
does
not
rise.
Presser
does
not
drop.
Cause
Work
clamp
operation
is
sluggish.
Presser
lifter
amount
is
too
great.
Too
much
friction
between
presser
plate
and
presser
arm
lever
support.
Presser
is
contacting
thread
wiper.
_
Presser
lifter
link
is
not
moving
back.
Presser
lift
amount
is
incorrect.
*2
Work
clamp
does
not
close.
Thread
wiper
does
not
operate
correctly.
Lower
thread
winds
to
one
side.
Lower
thread
winding
amount
is
incorrect.
Threads
comes
unthreaded.
Incorrect
position
of
presser
arm
lever
plate.
Incorrect
position
of
presser
closing
roller.
The
thread
wiper
is
obstructing
the
needle.
Thread
wiper
position
is
incorrect.
Bobbin
winder
thread
tension
stud
height
is
incorrect.
Bobbin
presser
position
is
incorrect.
Stitches
being
skipped
at
the
sewing
start.
Uneven
upper
thread
length.
Upper
thread
is
too
short.
*1
Not
applicable
for
the
B432E
Mark
II.
*2
B432E
Mark
II
only.
Check
Sliding
part
of
the
work
clamp
lubrication
Distance
between
work
clamp
and
top
of
needle
plate
Presser
plate
and
presser
arm
lever
support
lubrication
Thread
wiper
standby
_
position
Link
return
spring
is
unhooked.
Distance
between
—
work
clamp
and
top
of
needle
plate
Whether
stop
lever
is
engaged
with
stop
position
adjustment
bar
or
not
d
Clearance
beween
thread
wiper
and
needle
tip
Thread
wiper
position
Bobbin
winder
thread
tension
stud
height
Thread
winding
amount
Refer
to
"Skipped
stitches
occur"
Upper
thread length
Thread
take-up
lever
stroke
Remedy
Page
Grease
the
sliging
part
of
the work
clamp.
36
Adjust
the
height
of
the work
clamp
to
36
-
37
within
17
mm.
Grease
the
presser
plate
and
presser
arm
lever
support.
36
Adjust
the
position
of
39
the
thread
wiper.
Hook
the
link
return
spring
properly.
z
Adjust
the work
clamp
lift
amount.
36
-
37
Adjust
the
position
of
presser
closing
roller.
38
Adjust
the
height
of
the
thread
wiper.
39
Adjust
the
operating
distance
of
the
thread
wiper.
39
Adjust
the
height
of
the
thread
tension
stud.
24
Adjust
the
position
of
the
bobbin
presser.
24
Refer
to
"Skipped
stitches
occer".
Adjust
the
sub
-
tension.
26
Adjust
the
thread
take-up
lever
stroke.
34
1K3-B430E-,
B431E-,
B432E-,
8433E-
Mark
it
62