PT-1900 FAQs & Troubleshooting PT-1900 Not your product? Sort by Updated Date Popularity 4 Results 1. 12/23/2020 How do I print multiple lines and how many lines can I print? 2. 11/02/2020 How do I change the character size? 3. 11/15/2017 How do I adjust the tape margin? 4. 10/31/2014 How do I clear the display? Machine FAQs & Troubleshooting