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9. TROUBLESHOOTING
9. FEHLERSUCHE
9. RESOLUTION DES PROBLEMES
9. LOCALIZACION DE AVERIAS
9. TROUBLESHOOTING
Turn off the power switch and disconnect the power cord before carrying out troubleshooting,
otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury.
* The motor will keep turning even after the power is switched off as a result of the motor's inertia.
Wait until the motor stops fully before starting work.
Problem
Upper thread breaks
Lower thread breaks
Skipped stitches
79
All manuals and user guides at all-guides.com
CAUTION
Cause
Needle bent or blunt.
Needle
Needle is incorrectly
Needle position
installed.
Threading is incorrect.
Threading
Upper thread tension is
Main
too strong.
tension
Needle
and
rotary
Needle
hook
timing
is
hook timing
incorrect.
Lower thread tension is
Lower thread tension
too strong.
Oil
and
lint
stick
around
the
bobbin
Bobbin case
case.
Needle bent or blunt.
Needle
Needle is incorrectly
Needle position
installed.
Threading is incorrect.
Threading
Needle
and
rotary
Needle
hook
timing
is
hook timing
incorrect.
HM-8180
Check
Remedy
Replace the needle.
Install
correctly.
Thread
thread correctly.
and
auxiliary
Adjust
appropriate tension.
Adjust the timing of the
and
rotary
needle
hook.
Adjust
appropriate tension.
Remove lint and wipe
off oil.
Replace the needle.
Install
correctly.
Thread
thread correctly.
Adjust the timing of the
and
rotary
needle
hook.
Page
the
needle
26
the
upper
27
to
an
32
50,
and
rotary
51,
53
to
an
31
43
the
needle
26
the
upper
27
50,
and
rotary
51,
53
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