Troubleshooting
Operating Instructions 650-10 - 03.0 - 08/2016 157
Loose stitches • Thread tensions are not
adjusted to the sewing
material, the sewing
material thickness or
the thread used
• Check thread tensions
• The needle and hook
thread
s are not threaded
correctly
• Check threading path
( Operating Instruc-
tions, Operation)
Needle
br
eakage
• Needle thickness is
unsuitable for the sewing
material or the thread
• Use recommended
ne
edle
Seam
be
ginning
not secure
• Residual tension is too
tight for the needle
thread
• Adjust residual tension
Meaning Possible causes Remedial action
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