Errors In Sewing Process - Duerkopp Adler 669 Premium Operating Instruction

Troubleshooting
Operating Instructions 669 PREMIUM - 00.0 - 11/2016

10.3 Errors in sewing process

Error Possible causes
Unthreading Needle thread pretension
at seam is too firm
beginning
Thread Needle thread and hook
breaking thread have not been
threaded correctly
Needle is bent or sharp-
edged
Needle is not inserted
correctly into the needle
bar
The thread used is
unsuitable
Thread tensions are too
tight for the thread used
Thread-guiding parts, such
as thread guides, are
sharp-edged
Throat plate or hook have
been damaged by the
needle
Remedial action
Check needle thread
pretension ( p. 33).
Check threading path
( p. 24).
Replace the needle
( p. 22).
Insert the needle correctly
into the needle bar
( p. 22).
Use recommended thread
( p. 143).
Check thread tensions
( p. 32).
Check threading path
( p. 24).
Have parts reworked by
qualified specialists
141