TJ-4420TN FAQs & Troubleshooting TJ-4420TN Not your product? Sort by Updated Date Popularity 3 Results 1. 10/18/2023 How to open the Devices and Printers window 2. 10/18/2023 How to identify your Operating System (OS) for Windows or Mac 3. 04/18/2022 My printed documents are incomplete or a blue screen appears when printing after a Windows 10 update (March 2021) Operating System FAQs & Troubleshooting