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Problem
Poor thread tightening
Needel breaks
Thread end remains at
start of sewing
Cause
Lower thread tension is
too strong.
Upper thread is not
tight.
Lower thread is not
tight.
Bobbin case threading
is incorrect.
Needle is incorrectly
installed.
Needle
and
rotary
hook
timing
is
incorrect.
Stitch
width
is
incorrect.
Upper thread scissors
position is too high.
Upper thread fastening
is incorrect.
Upper thread fastening
tension is too weak.
9. TROUBLESHOOTING
9. FEHLERSUCHE
9. RESOLUTION DES PROBLEMES
9. LOCALIZACION DE AVERIAS
Check
Lower thread tension
Upper thread tension
Lower thread tension
Bobbin case threading
Needle position
Needle
and
rotary
hook timing
Needle swing
Height of scissors D
Upper thread fastening
cam position
Upper thread fastening
tension
HM-8180
Remedy
Adjust
to
an
appropriate tension.
Adjust
to
an
appropriate tension.
Adjust
to
an
appropriate tension.
Thread
the
bobbin
correctly to match the
sewing.
Install
the
needle
correctly.
Adjust the timing of the
needle
and
rotary
hook.
Adjust the stitch width
and
stitch
reference
position.
Adjust the position of
the
upper
thread
scissors.
Adjust the position of
the
upper
thread
fastening cam.
Adjust
the
upper
thread
fastening
tension.
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