DURKOPP ADLER 581 Operating Instructions Manual page 187

Troubleshooting
Operating Instructions 581 - 02.0 - 05/2019
Meaning Possible causes
Loose stitches • Thread tensions are not
adjusted to the sewing
material, the sewing
material thickness or the
thread used
• Needle thread and hook
thread have not been
threaded correctly
Needle • Needle thickness is
breakage unsuitable for the sewing
material or the thread
Seam • Residual tension is too
beginning not tight for the needle
secure thread
Buttonhole • Cutting pressure is
is not clean insufficient
• Switch-on time of the
cutting block is too short
• Cutting edge of knife is
blunt or chipped
• A cutting block that does
not correspond to the
knife is used
Remedial action
• Check thread tensions
• Check threading path
• Use recommended
needle
• Adjust residual tension
• Increase the cutting
pressure ( Service
Instructions)
• Increase switch-on time
 p. 93
• Replace and set the knife
( Service Instructions)
• Replace cutting block
and set ( Service
Instructions)
185