Operation Manual

Operating Instructions 650-10 - 02.0 - 10/2015 145
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
threads are not threaded
correctly
• Check threading path
(
Operating Instruc-
tions, Operation)
Needle
breakage
• Needle thickness is
unsuitable for the sew
-
ing material or the thread
• Use recommended nee-
dle
Seam
beginning
not secure
• Residual tension is too
tight for the needle
thread
• Adjust residual tension
Meaning Possible causes Remedial action