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17. TROUBLESHOOTING
170 KE-430F, BE-438F
Problem Cause Remedy Ref.
Movable knife is blunt. Replace the movable knife.
P. 111
Fixed knife is blunt. Sharpen or replace the fixed knife.
P. 111
Adjust the position of the shuttle race
thread guide.
P. 108
Movable knife does not pick up the
thread.
Adjust the needle bar lift amount. P. 107
The movable knife does not pick up the
thread because of skipped stitches at
the sewing end.
Refer to “Skipped stitches occur”. P. 169
Movable knife position is incorrect.
Adjust the position of the movable
knife.
P. 110
Upper thread is not
trimmed.
Sub-tension is too weak.
Turn the sub-tension nut to adjust the
tension.
CD
Instruction
manual
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 105
Incorrect needle and rotary hook timing. Adjust the needle bar lift amount. P. 107
Thread jamming.
Shuttle race thread guide is not
separating the threads.
Adjust the position of the shuttle race
thread guide.
P. 108
Shuttle race thread guide is separating
the threads insufficiently.
Adjust the position of the shuttle race
thread guide.
P. 108
Upper thread is not properly tight. Adjust the upper thread tension.
CD
Instruction
manual
Uneven needle thread. Adjust the sub-tension.
CD
Instruction
manual
Needle thread is too long.
Adjust the sub-tension.
<When using the thread nipper
device>
Turn the tension nut to adjust the upper
thread trailing length to 35 – 38 mm.
CD
Instruction
manual
Poor seam finish on
reverse side of
material.
Needle is striking the button. (BE-438F)
Refer to “5-5. Checking the sewing
pattern (BE-438F)” in the CD instruction
manual.
CD
Instruction
manual
Upper thread tension is too weak. Adjust the upper thread tension.
CD
Instruction
manual
Lower thread tension is too weak. Adjust the lower thread tension.
CD
Instruction
manual
Incorrect thread
tightness.
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 105
Check if the machine head switch cord
is disconnected.
CD
Instruction
manual
Adjust the position of the switching
plate.
P. 127
Machine does not
operate when power is
turned on and foot
switch is depressed.
Machine head switch does not work.
Replace the machine head switch if it is
broken.