RJ-4030 FAQs & Troubleshooting RJ-4030 Not your product? Sort by Updated Date Popularity 3 Results 1. 18/10/2023 Printing is not possible. (USB connection) 2. 22/10/2020 A communication error occurs when printing via serial cable (RS-232C). 3. 04/10/2019 I cannot print in Windows 10 using Bluetooth® even though my machine and computer are paired. Connecting to a Computer FAQs & Troubleshooting