Troubleshooting
Operating Instructions M-TYPE DELTA - 01.0 - 08/2019 193
10.3 Errors in sewing process
Error Possible causes Remedial action
Unthreading
at seam
beginning
Needle thread pretension
is too firm
Check needle thread
pretension ( p. 40).
Thread
breaking
Needle thread and hook
thread have not been
threaded correctly
Check threading path
( p. 25).
Needle is bent or
sharp-edged
Replace the needle
( p. 22).
Needle is not inserted
correctly into the needle
bar
Insert the needle correctly
into the needle bar
( p. 22).
The thread used is
unsuitable
Use recommended thread
( p. 195).
Thread tensions are too
tight for the thread used
Check thread tensions
( p. 40).
Thread-guiding parts,
such as thread guides,
are sharp-edged
Check threading path
( p. 25).
Throat plate or hook have
been damaged by the
needle
Have parts reworked by
qualified specialists
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