Troubleshooting - Brother KE-430B Instruction Manual

16. TROUBLESHOOTING

16. TROUBLESHOOTING
Problem
Presser does not rise.
Presser does not
drop.
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.
*1 Not applicable for the KE-432B.
*2 KE-432B only.
62
Cause
*1
Work clamp
operation is sluggish.
Presser lifter amount
is too great.
*1
Too much friction between
presser plate and presser
arm lever support.
Presser is contacting
thread wiper.
Presser lifter link is
not moving back.
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.
KE-430B, 431B, 432B, 433B
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
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
Grease the sliging
part of the work
clamp.
Adjust the height of
the work clamp to
within 17 mm.
Grease the presser
plate and presser arm
lever support.
Adjust the position of
the thread wiper.
Hook the link return
spring properly.
Adjust the work
clamp lift amount.
Adjust the position of
presser closing roller.
Adjust the height of
the thread wiper.
Adjust the operating
distance of the thread
wiper.
Adjust the height of
the thread tension
stud.
Adjust the position of
the bobbin presser.
Refer to "Skipped
stitches occer".
Adjust the sub-
tension.
Adjust the thread
take-up lever stroke.
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