Troubleshooting
Operating Instructions 650-10 - 03.0 - 08/2016 155
11.3 Errors in sewing process
Meaning Possible causes Remedial action
Thread
br
eakage
• The needle and hook
threads are not threaded
correctly
• Check threading path
( Operating Instruc-
tions, Operation)
• Needle is bent or sharp-
edged
• Needle is not inserted
cor
rectly into the needle
bar
• Replace the needle
• Insert the needle into the
ne
edle bar
• The needle used is
unsuit
able
• Use recommended
thread ( Operating
Instr
uctions)
• Thread tensions are too
tigh
t for the thread used
• Check thread tensions
( Operating Instruc-
tions, Operation)
• Thread-guiding parts
such as thr
ead tube,
thread guide or thread-
takeup disk are sharp-
edged
• Check the thread path
• Throat plate, hook or
spr
ead have been dama-
ged by the needle
• Have parts reworked by
qualified specialists