DURKOPP ADLER 670 Operating Instructions Manual page 96

94
Error Possible cause
Skip stitch Needle is
• blunt
• bent
• not properly inserted
Needle thread and hook
thread have not been
threaded correctly
Thread tension is set too
firm
Sewing material is not held
correctly
Needle thickness is
incorrect
Throat plate or hook has
been damaged by the
needle
Hook is set incorrectly
Loose stitch Thread tension not
adjusted to
• Sewing material
• Sewing material
thickness
• Thread
Needle thread and hook
thread have not been
threaded correctly
Needle Needle thickness not
breakage suitable for
• Sewing material
• Sewing material
thickness
• Thread
Remedial action
Insert new needle  p. 18
Check threading path of
needle thread  p. 20
and hook thread  p. 24
Check thread tension
 p. 27
Check sewing foot
pressure  p. 34
Use recommended needle
thickness  p. 95
Have parts replaced
 Service Instructions
Check thread tension
 p. 26
Check threading path of
needle thread  p. 20
and hook thread  p. 24
Alter needle thickness
 p. 18
Operating Instructions 670/680 - 00.0 - 01/2017
Troubleshooting