PRS100 FAQs & Troubleshooting PRS100 Not your product? Sort by Updated Date Popularity 4 Results 1. 08/07/2015 Maintenance (Cleaning the thread paths of the upper threads) 2. 08/07/2015 Maintenance (Cleaning the bobbin case) 3. 08/07/2015 Maintenance (Cleaning around the needle plate) 4. 08/07/2015 Maintenance (Clean the hook) Maintenance FAQs & Troubleshooting