MFC-7420 FAQs & Troubleshooting MFC-7420 Not your product? Sort by: Updated Date Popularity 4 Results 1. 27/01/2014 "Paper Jam Inside" error appears on the LCD. What should I do? 2. 27/01/2014 "Paper Jam Rear" error appears on the LCD. What should I do? 3. 27/01/2014 "Paper Jam Tray" error appears on the LCD. What should I do? 4. 17/11/2008 "Document Jam" error appears on the LCD. What should I do? Paper Feed / Paper Jam FAQs & Troubleshooting