124
Sewing machine will not sew
when start/stop button is
pressed.
Thread tension cannot be
properly regulated.
Thread breaks.
Stitch skips.
Seam puckering occurs.
Speed controller has been
plugged in.
Unplug speed controller.
Sewing machine is incorrectly
threaded.
Thread used has kinks or
knots.
Thread tension is not properly
adjusted.
Needle is bent or has blunt tip.
Needle is incorrectly attached.
Rotating hook bobbin case
holder is incorrectly threaded.
Bobbin fails to smoothly rotate
in rotating hook bobbin case
holder.
Needle does not match thick-
ness of thread used.
Thread take-up lever is not
threaded.
Check threading sequence
and re-thread machine head
correctly.
Remove kinks or knots from
thread.
Check relation between stitch
pattern selected and sewing
thread used. Then, properly
adjust thread tension.
Replace needle with a normal
one.
Correctly attach needle.
Check threading route of
bobbin thread.
Check how bobbin thread is
wound round bobbin.
Check relation between
sewing thread and needle.
Check threading route of
needle thread.
Thread detecting thread guide
is not threaded.
Sewing machine head is not
properly threaded.
Bobbin thread is not properly
routed.
Orientation of thread spool
cap does not match that of
thread spool.
Securely thread thread de-
tecting thread guide so that
thread passes deepest part of
guide.
Check how machine head is
threaded.
Check threading route of
bobbin thread.
Attach thread spool cap in
correct orientation with
respect to thread spool.
Stitch length is too large to
sew light-weight fabric.
Needle has blunt tip.
Decrease (shorten) stitch
length.
Replace needle with a normal
one.
9
11,12
_
22
27
27
120
_
27
11,12,
121
11,12,
121
11,12,
121
120
11,12
20
27
Sewing machine fails to auto-
matically wind a bobbin.
Main body of sewing machine
is not properly threaded.
Retaining plate is not properly
thread with (embroidery)
thread
Parts related to bobbin
winding is tangled with thread
waste or thread.
Check threading sequence of
machine head and re-thread it
properly.
Open thread retaining cover
to check that retaining plate is
properly threaded. Re-thread
retaining plate using bobbin
winder guide.
Remove thread waste or
thread using a pair of
tweezers.
13,14
66
_
Specification table
Standard sewing machine
Embroidery Unit
Item Specification
Item Specification
Dimensions
Dimensions when
attached with case
Weight
Rated
voltage/power con-
sumption
Power consump-
tion of lamp
479 (W) x 324 (H) x 215 (D) mm
495 (W) x 330 (H) x 235 (D) mm
12.4 kg (when attached with case: 13.7 kg)
120/0.9A 60 Hz
13.5V / 3W
Dimensions when
installed on sewing
machine
Weight
33.5 (W) x 13.0 (H) x 32.0 (D) cm
59.5 (W) x 32.4 (H) x 33.5 (D) cm
2.3 kg (when installed on sewing
machine: 13.0 kg)
Problem Cause (Reason) Action to be taken
Dimensions
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