Brother HM-8180 Instruction Manual page 99

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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