Dürkopp Adler 1767 Operating Instructions Manual page 107

Troubleshooting
Operating Instructions 1767 - 00.0 - 12/2016
Error Possible causes
Missing stitches Needle thread and hook
thread have not been
threaded correctly
Needle is blunt or bent
Needle is not inserted
correctly into the needle
bar
The needle thickness used
is unsuitable
The thread reel holder is
installed incorrectly
Thread tensions are too
tight
Throat plate, hook or
spread have been
damaged by the needle
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
Remedial action
Check threading path
Replace the needle
Insert the needle correctly
into the needle bar
Use recommended needle
thickness
Check the assembly of the
thread reel holder
Check thread tensions
Have parts reworked by
qualified specialists
Check thread tensions
Check threading path
Use recommended needle
thickness
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