50
Trouble shooting guide
Problem Cause Solution Page
The machine does
not sew:
• Looper or cloth plate cover is open.
• The main switch is not on.
• The machine is not plugged in.
• Close the looper or the cloth plate cover.
• Switch machine on. (Main switch to “I”)
• Insert plug into main socket.
13
13
11
Fabric does not
feed evenly
• Differential feed is wrongly adjusted.
• Presser foot pressure is too low.
• Check the differential feed setting.
• Adjust the presser foot pressure.
24
28
Thread breaks • Thread tension is too tight for the thread being
used.
• The machine is not threaded correctly.
• Needles are incorrectly inserted.
• Wrong needles.
• Reduce thread tension.
• Check the threading.
• Insert needles fully into needle clamp with
at side to the back.
• Use needle system 130/705H or JLx2.
39
32
18
18
Needles break • Needles are bent or blunt, points are damaged.
• Needles are not inserted correctly.
• Fabric was pulled while sewing.
• Replace needles.
• Insert needles fully into needle clamp with
at side to the back.
• Guide fabric gently with both hands.
19
18
--
Skipped stitches • Needles are bent or blunt.
• Wrong needles used.
• Presser foot pressure is too low.
• Replace the needles.
• Use needle system 130/705H or JLx2.
• Increase presser foot pressure.
18
18
28
Poor stitch forma-
tion
• Threads are not correctly between the tension
dials.
• Thread has got caught.
• Machine is incorrectly threaded.
• Check if thread is lying between tension
discs.
• Raise the presser foot and pull the thread.
• Check threading path of each thread.
• Check threading path of each thread.
29
29
32
32
Seams ute or
wave, especially
when sewing knits
• Fabric was pulled while sewing.
• Presser foot pressure is too tight.
• Differential feed is set incorrectly.
• Guide fabric gently.
• Reduce presser foot pressure.
• Adjust differential feed to N - 2.
--
28
24, 25
Seams pucker • Needle thread tension is too tight.
• Differential feed is set incorrectly.
• Reduce the needle thread tension.
• Adjust differential feed to 0.7 - N.
39
24, 25
Fabric edges curl • Too much fabric is in the stitch.
• Thread tension is too tight.
• Stitch selection lever is on roll hem.
• Reduce cutting width.
• Reduce thread tension.
• Set selection lever to overlock.
23
39
27
Thread loops are
too loose
• Too little fabric in the stitch. • Increase the cutting width. 23
Motor failure • Noise is heard.
• Motor does not turn at all.
• Sparks are abnormally large.
• Replace the carbon brush with a new one.
(Note) Contact your distributor to ask for the
replacement of the carbon brush.
--
Needle eyelet can-
not be threaded
• The “
” marking on the side of the front cover is
not aligned with the “
” marking on the hand-
wheel.
• Turn the handwheel to align the “
” mark-
ing on it with the “
” marking on the side
of the front cover.
34, 35
Upper and lower
loopers cannot be
threaded
• When the handwheel is not xed.
• When the thread is not inserted into the bottom of
the threading hole.
• When the thread is not slacked before the thread-
ing hole.
• When the thread is caught somewhere in the
thread path.
• When the pipe is clogged with lint.
• Raise the threading changeover lever and
turn the handwheel to x it.
• Insert the thread into the threading hole by 1
to 2 cm.
• Slack the thread before the threading hole.
• Remove the thread from the location where
it has been caught.
• Thread the loopers by means of the looper
threader supplied in the accessory bag to
remove the lint in the pipe.
32, 33
32, 33
32, 33
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36
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