PR680W / PR680WC FAQs & Troubleshooting PR680W / PR680WC Not your product? Sort by Updated Date Popularity 3 Results 1. 08/06/2024 Tutorial videos on how to use the machine [Video instructions] 2. 07/29/2016 Maintenance (Cleaning the thread paths of the upper threads) [ Video ] 3. 07/29/2016 Maintenance (Cleaning the bobbin case) [ Video ] Maintenance FAQs & Troubleshooting