Troubleshooting - Siruba C007K Instruction Book

TROUBLESHOOTING
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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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Problem
Exam and Adjustment
1.
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Needle thread too tight/ loose
The tension of the needle thread is too loose or
too tight?
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Adjust the needle thread tension.
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2.
The skipping stitch of needle thread
Choose the wrong needle?
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Select the needle and thread number match the
fabrics.
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Bad needle?
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Change a new needle.
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Incorrect threading.
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Follow the threading diagram.
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Incorrect needle installation.
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Reinstall the needle to make the long slot of
needle face the operator.
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The needle tip is broken or bent.
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Change a new needle.
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The looper tip is blunt.
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Polish by the oilstone or fine emerypaper. Or
replace with new looper.
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The looper tension is too loose or too tight.
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Adjust the thread tension properly.
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