LB5500 FAQs & Troubleshooting LB5500 Not your product? Sort by Updated Date Popularity 3 Results 1. 02/17/2023 How do I adjust the sensitivity of the operation keys? 2. 05/31/2021 Machine does not start to sew. 3. 07/21/2017 Touch panel is malfunctioning. General Problem FAQs & Troubleshooting