Troubleshooting - Brother KE-430F Service Manual

17. TROUBLESHOOTING

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.
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
Work clamp does not
rise. (KE-430F)
Button clamp does not
rise. (BE-438F)
Work clamp lift amount
is incorrect. (KE-430F)
Button clamp lift
amount is incorrect.
(BE-438F)
Thread wiper does not
operate correctly.
Lower thread winds to
one side.
Lower thread winding
amount is incorrect.
Thread comes
unthreaded.
168
Cause
Work clamp operation is sluggish.
Too much friction between work clamp
lifter plate and work clamp arm lever
plate.
Work clamp is contacting thread wiper.
Work clamp is contacting thread wiper.
Incorrect position of work clamp arm
lever plate
Incorrect position of button clamp holder
hook.
The thread wiper is obstructing the
needle.
Thread wiper position is incorrect.
Height of bobbin winder
assembly is incorrect.
Bobbin presser position is incorrect.
Stitches being skipped at the sewing
start.
Uneven needle thread.
Needle thread is too short.
KE-430F, BE-438F
CAUTION
Grease the sliding part of the work
clamp.
Grease the work clamp lifter plate and
work clamp arm lever plate.
Adjust the position of the thread wiper.
Adjust the position of the thread wiper.
Adjust the work clamp lift amount.
Adjust the button clamp lift amount.
Adjust the height of the thread wiper.
Adjust the operating distance of the
thread wiper.
Adjust the operating distance of the
thread wiper.
tension Adjust the height of the bobbin winder
tension assembly.
Adjust the position of the bobbin
presser.
Refer to "Skipped stitches occur"
Adjust the sub-tension.
Use a thread nipper device.
Remedy Ref.
P. 112
P. 112
P. 114
P. 114
P. 112
P. 112
P. 114
P. 114
P. 114
CD
Instruction
manual
CD
Instruction
manual
P. 169
CD
Instruction
manual
CD
Instruction
manual