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Problem
Lower thread tension is
too strong.
Upper thread is not
tight.
Poor thread tightening
Lower thread is not
tight.
Bobbin case threading
is incorrect.
Needle is incorrectly
installed.
Needle
hook
Needel breaks
incorrect.
Stitch
incorrect.
Upper thread scissors
position is too high.
Thread end remains at
Upper thread fastening
start of sewing
is incorrect.
Upper thread fastening
tension is too weak.
All manuals and user guides at all-guides.com
Cause
Lower thread tension
Upper thread tension
Lower thread tension
Bobbin case threading
Needle position
and
rotary
Needle
timing
is
hook timing
width
is
Needle swing
Height of scissors D
Upper thread fastening
cam position
Upper thread fastening
tension
HM-8180
9. TROUBLESHOOTING
9. FEHLERSUCHE
9. RESOLUTION DES PROBLEMES
9. LOCALIZACION DE AVERIAS
Check
Remedy
Adjust
appropriate tension.
Adjust
appropriate tension.
Adjust
appropriate tension.
Thread
correctly to match the
sewing.
Install
correctly.
Adjust the timing of the
and
rotary
needle
hook.
Adjust the stitch width
and
stitch
position.
Adjust the position of
the
upper
scissors.
Adjust the position of
the
upper
fastening cam.
Adjust
thread
tension.
Page
to
an
31
to
an
32
to
an
31
the
bobbin
30
the
needle
26
50,
and
rotary
51,
53
reference
67
thread
60
thread
75
the
upper
fastening
75
80
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