JUKI ACF-172-1790 Instruction Manual page 39

Troubles
7. Stitch skipping 1. Button hole is small in terms of the size of
2. Material flops because of light-weight.
3. Attaching needle is wrong.
4. Needle is bent.
5. There is a burr or scratch on the blade point
8. Thread frays. 1. Number of stitches of tie stitching is too
2. Width of tie stitching is too wide.
9. L e n g t h o f n e e d l e 1. Width of tie stitching is too narrow.
thread remaining at the
end of sewing is too
long. 2. Tension of tie stitching is too low.
10. Needle thread breaks 1. Tension at the start of sewing is too low.
at the start of sewing,
or the wrong side of
seam is dirty.
11. K n i f e d r o p s e v e n 1. Thread breakage detection plate is
when needle thread is
cut.
12. Needle breaks. 1. Needle is bent.
2. Needle comes in contact with the blade point
3. Needle thread trimmer comes in contact with
4. Needle does not come to the center of the
5. Needle stop position is low and the needle
13. Knife drops plural 1. Cloth cutting knife is not set to the plural
times.
14. Air blows from preset. 1. Blower motor is rotating in the reverse
15. Preset does not move 1. Cloth is not detected since it is coarse.
even when start switch
is pressed.
16. Cloth is folded when 1. Air blow is excessively high or low.
cloth is delivered from
preset to carriage.
17. Cloth slips when cloth 1. Vacuum force is excessively low.
is delivered from preset
to carriage.
2. Clamp force is excessively low.
Causes
presser.
of hook.
small.
improperly adjusted.
of hook.
needle when it opens.
needle hole of throat plate.
comes in contact with the needle thread
trimmer when it closes.
times motion setting.
direction.
Corrective measures
Replace the presser with a smaller
one.
Delay the hook-to-needle timing.
(Lower the needle bar by 0.5 mm.)
Adjust again the direction, height, etc.
Replace the needle.
Buff the blade top of hook. Or, replace
the hook.
Increase the number of stitches of tie
stitching at the end of sewing.(Sewing
data )
Narrow the width of tie stitching at the
end of sewing.(Sewing data
Widen the width of tie stitching at the
end of sewing.(Sewing data
Increase tension at the end of
sewing.(Memory switch data
)
Increase tension at the start of
sewing.(Memory switch data
)
Adjust the detector plate.
(Refer to the Engineer's Manual.)
Replace the needle.
Adjust the needle-to-hook timing.
Adjust the installing position of needle
thread trimmer.
Re-adjust the installing position of
throat plate base.
Release the plural time setting.
Change the direction of rotation of the
motor.
Release the cloth detection.(Memory
switch data
Adjust the air blow.
Clean the air filter.
Adjust the cloth suction force of the
vacuum.
Adjust the clamp.
36
Page
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MACHINE
OPERATION
6-1
MACHINE
OPERATION
4-2(1)
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PANEL
OPERATION
2-7
PANEL
) OPERATION
2-7
PANEL
)
OPERATION
2-7
PANEL
OPERATION
2-17
PANEL
OPERATION
2-17
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MACHINE
OPERATION
4-2(1)
MACHINE
OPERATION
6-1
MACHINE
OPERATION
6-2
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MACHINE
OPERATION
2-16
MACHINE
OPERATION
3-3
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)
MACHINE
OPERATION
4-1(7)
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MACHINE
OPERATION
4-1(8)
MACHINE
OPERATION
4-4