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BM3850 > FAQs & Troubleshooting > One Point > faqh000095_006
Sewing performance will suffer if dust collects in the bobbin case.Therefore, it should be cleaned periodically.
Make sure you unplug the machine before you clean it, otherwise you risk getting an electric shock or being injured.
Mark on the handwheel
Use the oval screwdriver
Cleaning brush Race
Do not apply oil to the bobbin case.
Align the and marks.
Make sure that the indicated points are aligned before installing the bobbin case.
BB370, BM2800, BM3700, BM3850, SB170, SB530T, XB2500, XL2800, XL3700, XM3700, XR53
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