Troubleshooting
Operating Instructions 581 - 01.0 - 05/2016 171
10.3 Errors in sewing process
Meaning Possible causes Remedial action
Thread
br
eakage
• The needle and looper
threads are not threaded
correctly
• Check threading path
• Needle is bent or sharp-
ed
ged
• Needle is not inserted
cor
rectly into the needle bar
• Replace the needle
• Insert the needle into the
ne
edle bar
• The thread used is
unsuit
able
• Use the recommended
thread ( Service
Instr
uctions)
• Thread tensions are too tight
f
or the thread used
• Check thread tensions
• Thread-guiding parts such as
th
read tubes, thread guide or
thread take-up disk are
sharp-edged
• Check the thread path
• Throat plate, looper or
sp
reader have been
damaged by the needle
• Have parts reworked by
qualified specialists
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