Troubleshooting
Operating Instructions 581 - 01.0 - 05/2016 173
Loose
stitches
• Thread tensions are not
adjusted to the sewing
material, the sewing material
thickness or the thread used
• Check thread tensions
• The needle and looper
th
reads are not threaded
correctly
• Check threading path
Needle
br
eakage
• Needle thickness is
unsuitable for the sewing
material or the thread
• Use recommended
needle
Seam
be
ginning
not secure
• Residual tension is too tight
for the needle thread
• Adjust residual tension
Buttonhole
is not clean
• Cutting pressure is
insuf
ficient
• Increase the cutting
pressure ( Service
Instr
uctions)
• Switch-on time of the cutting
blo
ck is too short
• Increase switch-on time
( Service Instructions)
• Cutting edge of blade is blunt
or
chipped
• Replace and set blade
( Service Instructions)
• A cutting block that does not
co
rrespond to the blade is
used
• Replace cutting block and
set (
Service
Instructions)
Meaning Possible causes Remedial action
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