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PR-650/650C > FAQs & Troubleshooting > Trouble Shooting > faqh000597_000
Maintenance (Cleaning the bobbin case)
Thread wax and dust easily collect around the hole in the tension-adjusting spring on the bobbin case, resulting in an incorrect thread tension. Therefore, it should be cleaned each time when the bobbin is changed. Use a piece of paper with the thickness of a business card.
Unplug the power supply cord before cleaning the machine, otherwise injuries or an electric shock may occur.
Use a corner of the paper to remove any dust from around the hole.
Do not bend the tension-adjusting spring.In addition, do not use anything other than thick paper or paper of the specified thickness to clean the bobbin case.
Be sure to close the hook cover before using the embroidery machine. Embroidery fabric may be caught and cause mechanical issues if the hook cover is left open.
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