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17. TROUBLESHOOTING
168 KE-430F, BE-438F
17. TROUBLESHOOTING
• Please check the following points before calling for repairs or service.
• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the
machine may operate if the foot switch is depressed by mistake, which may result in injury.
Problem Cause Remedy Ref.
Work clamp operation is sluggish.
Grease the sliding part of the work
clamp.
P. 112
Too much friction between work clamp
lifter plate and work clamp arm lever
plate.
Grease the work clamp lifter plate and
work clamp arm lever plate.
P. 112
Work clamp does not
rise. (KE-430F)
Work clamp is contacting thread wiper. Adjust the position of the thread wiper. P. 114
Button clamp does not
rise. (BE-438F)
Work clamp is contacting thread wiper. Adjust the position of the thread wiper. P. 114
Work clamp lift amount
is incorrect. (KE-430F)
Incorrect position of work clamp arm
lever plate
Adjust the work clamp lift amount. P. 112
Button clamp lift
amount is incorrect.
(BE-438F)
Incorrect position of button clamp holder
hook.
Adjust the button clamp lift amount. P. 112
Adjust the height of the thread wiper. P. 114
The thread wiper is obstructing the
needle.
Adjust the operating distance of the
thread wiper.
P. 114
Thread wiper does not
operate correctly.
Thread wiper position is incorrect.
Adjust the operating distance of the
thread wiper.
P. 114
Lower thread winds to
one side.
Height of bobbin winder tension
assembly is incorrect.
Adjust the height of the bobbin winder
tension assembly.
CD
Instruction
manual
Lower thread winding
amount is incorrect.
Bobbin presser position is incorrect.
Adjust the position of the bobbin
presser.
CD
Instruction
manual
Stitches being skipped at the sewing
start.
Refer to “Skipped stitches occur” P. 169
Uneven needle thread. Adjust the sub-tension.
CD
Instruction
manual
Thread comes
unthreaded.
Needle thread is too short. Use a thread nipper device.
CD
Instruction
manual