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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.
20
20
18
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.
31
35
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.
48
41
25
25
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.
26
25
--
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.
25
25
35
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.
36
36
41
41
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.
--
35
31, 32
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.
48
31, 32
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.
30
48
34
Thread loops are
too loose
Too little fabric in the stitch. Increase the cutting width. 30
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.
43, 44
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.
41, 42
41, 42
41, 42
--
44
60


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