JUKI HZL-F series Instruction Manual page 99

Case
● The needle threading lever
will not return to the original
position and the machine
can not turn properly.
(This is in case the hook of
needle threader remains in
the needles eye.)
● The machine will not start
even when start/stop button
is pressed.
● Thread breaks.
● Stitch is skipped.
● Thread tension is not good. ● The needle thread is threaded in
● Puckering occurs.
● sign is shown on the
LCD display.
Cause (Reason)
● Hand wheel is turned by mistake
while the needle threading lever
is in down position. (in the process
of threading to the needle.)
● The foot controller is plugged in.
● The machine is incorrectly threaded.
● There is knot or knurl on the
thread.
● The setting of manual thread
tension is incorrect.
● The needle is bent or the tip of
needle is broken.
● The needle is installed incorrectly.
● Threading of bobbin thread is not
correct.
● The bobbin can not turn smoothly
inside the hook holder.
● The needle size does not match
the thread.
● Thread take-up is not threaded.
correctly.
● The bobbin thread is threaded
incorrectly.
● The direction of spool cap doesn't
match the spool.
● The stitch length is too large on
light-weight fabrics.
● The needle tip is broken.
● Safety mechanism works when
machine stops due to motor lock.
Solution
● Turn hand wheel slightly away
from you. (to the opposite side
when sewing).
● Start/stop button can function
when foot controller is removed.
● Rethread the machine correctly.
● Remove knot or knurl from
thread.
● Adjust thread tension manually
according to fabrics and thread
to be used.
● Change needle.
● Install needle correctly.
● Check the correct way of setting
bobbin thread.
● Check the correct way of
winding bobbin thread.
● Check the combination of thread
and needle.
● Rethread the machine correctly.
● Rethread the machine correctly.
● Check the correct way of setting
bobbin thread.
● Attach the spool cap in a correct
direction.
● Make the stitch length smaller
(shorter).
● Change needle.
● The safety mechanism will be
reset in a short while (about 10
minute) and the machine will
return to normal. (At this time, the
start/stop button will not light up.)
Refer-
ence
page
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8
19
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25
23
23
17
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24
19
19
17
19
36
23
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96
97