Operation Manual

Troubleshooting
Operating Instructions 610-10/630-10 - 00.0 - 01/2016 133
Loose stitches • Thread tensions are not adjusted to
the sewing material, the sewing
material thickness or the thread
used
• Check thread tensions ( p. 31)
• The needle and looper threads are
no
t threaded correctly
• Check the thread path ( p. 19)
Needle
b
reakage
• Needle thickness is unsuitable for
the sewing material or the thread
• Use recommended needle
Seam begin-
ning not secure
• Residual tension is too tight for the
ne
edle thread
• Adjust residual tension
Meaning Possible causes Remedial action