Operation Manual

Troubleshooting
Operating Instructions 610-10/630-10 - 00.0 - 01/2016132
11.3 Errors in sewing process
Meaning Possible causes Remedial action
Thread
b
reakage
• The needle and looper threads are
not threaded correctly
• Check the thread path ( p. 19)
• Needle is bent or sharp-edged
• Needle is not inserted correctly into
the
needle bar
• Replace the needle
• Insert the needle into the needle
bar
• The thread used is unsuitable • Use recommended thread
• Thread tensions are too tight for the
thr
ead used
• Check thread tensions ( p. 31)
• Thread-guiding parts such as
thr
ead tube, thread guide or thread-
takeup disk are sharp-edged
• Check the thread path
• Throat plate, looper or spread have
be
en damaged by the needle
• Have parts reworked by qualified
specialists
Missing stitches • The needle and looper threads are
no
t threaded correctly
• Check the thread path ( p. 19)
• Needle is blunt or bent
• Needle is not inserted correctly into
the
needle bar
• Replace the needle
• Insert the needle into the needle
bar
• The needle thickness used is
un
suitable
• Use recommended needle thick-
ness (
 p. 135)
• The thread reel holder is installed
incor
rectly
• Check thread reel holder ( p. 98)
• Thread tensions are too tight • Check thread tensions ( p. 31)
• Sewing material is not held
cor
rectly
• Check clamping pressure
• The loop stroke was not corrected
w
hen changing the zigzag stitch
width
• Set the loop stroke
• Incorrect parts used for the desired
sewing equipment
• Check the parts based on the
equipment sheet
• Throat plate, looper or spread have
be
en damaged by the needle
• Have parts reworked by qualified
specialists