DURKOPP ADLER 669 CLASSIC, Operating Instructions Manual

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Troubleshooting
110 Operating Instructions 669 - 00.0 - 08/2019
9.2 Errors in sewing process
Error Possible causes Remedial action
Unthreading
at seam
beginning Needle thread tension is
too firm Check needle thread
tension
Thread
breaking Needle thread and hook
thread have not been
threaded correctly Check threading path
Needle is bent or
sharp-edged Replace the needle
Needle is not inserted
correctly into the needle
bar Insert the needle correctly
into the needle bar
The thread used is
unsuitable Use recommended thread
Thread tensions are too
tight for the thread used Check thread tensions
Thread-guiding parts, such
as thread tube, thread
guide or thread take-up
disk, are sharp-edged Check threading path
Throat plate, hook or
spread have been
damaged by the needle Have parts reworked by
qualified specialists