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TROUBLESHOOTING
.~----~--~~----.w----~--------------------~-~------------------
...
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5!~CAUTION
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Before processing the troubleshooting, please turn off the power switch and unplug
the electronic cord. Otherwise, if touching the start switch incautiously, the sewing
machine
will function and will probably cause injuries happened
on
operators.
No.
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I
~~&~~
Problem
Exam
and Adjustment
1.
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t~~:t.J~t§~:j:;:§JG~/j\?
Needle thread too
tight/
loose
The tension
of
the needle thread is too loose or
too tight?
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o
Adjust the needle thread tension.
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?
2.
The skipping stitch
of
needle thread
Choose the wrong
needle?
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o
Select the needle and thread number match the
fabrics.
2
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Bad needle?
©~WTM~t
o
Change a new needle.
3.giD5i\1'IEfii o
Incorrect threading.
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Follow the threading diagram.
4.M~t~~1'IEfii
o
Incorrect needle installation.
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o
I
Reinstall the needle to make the long
slot
of
needle face the operator.
5.M~t~t~lltJT9JGIUB
o
The needle
tip
is broken
or
bent.
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o
Change a new needle.
6.~~t~t~W~
o
The looper
tip
is blunt.
©~ffl~E9JG~WM•e
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o
Polish
by
the oilstone or fine emerypaper. Or
replace
with new looper.
7.~~H~5N:t.J:t:7::9JG:t:'J'
o
The looper tension is too loose or too tight.
©il'i'~~-~SN:i.Jo
Adjust the thread tension properly.
-36-
From the library of: Superior Sewing Machine & Supply LLC
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