LX3850 FAQs & Troubleshooting LX3850 Not your product? Upper Threading How-to information about upper threading. Bobbin (Winding/Installing) How-to information about winding or installing bobbin. Needle/Thread/Fabric How-to information about needle, thread and fabric. How to use (Video FAQs) Video instructions for preparation for sewing. FAQs & Troubleshooting
