Instruction manual

Table Of Contents
KE-430B, 431B, 432B, 433B
62
16. TROUBLESHOOTING
16. TROUBLESHOOTING
Problem Cause Check Remedy Page
Presser does not rise.
Presser does not
drop.
Presser lift amount is
incorrect.
Work clamp
operation is sluggish.
Sliding part of the
work clamp
lubrication
Grease the sliging
part of the work
clamp.
36
Presser lifter amount
is too great.
Distance between
work clamp and top
of needle plate
Adjust the height of
the work clamp to
within 17 mm.
36
37
Too much friction between
presser plate and presser
arm lever support.
Presser plate and
presser arm lever
support lubrication
Grease the presser
plate and presser arm
lever support.
36
Presser is contacting
thread wiper.
Thread wiper standby
position
Adjust the position of
the thread wiper.
39
Presser lifter link is
not moving back.
Link return spring is
unhooked.
Hook the link return
spring properly.
Incorrect position of
presser arm lever
plate.
Distance between
work clamp and top
of needle plate
Adjust the work
clamp lift amount.
36
37
Thread wiper does
not operate correctly.
The thread wiper is
obstructing the
needle.
Clearance beween
thread wiper and
needle tip
Adjust the height of
the thread wiper.
39
Thread wiper
position is incorrect.
Thread wiper
position
Adjust the operating
distance of the thread
wiper.
39
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
Stitches being
skipped at the sewing
start.
Refer to Skipped
stitches occur
Refer to Skipped
stitches occer.
Threads comes
unthreaded.
Uneven upper thread
length.
Upper thread length
Adjust the sub-
tension.
26
Upper thread is too
short.
Thread take-up lever
stroke
Adjust the thread
take-up lever stroke.
34
Work clamp does not
close.
Incorrect position of
presser closing roller.
Adjust the position of
presser closing roller.
38
*1
*2
*1
Whether stop lever is
engaged with stop position
adjustment bar or not
*1 Not applicable for the KE-432B.
*2 KE-432B only.