MFC-7820N FAQs & Troubleshooting MFC-7820N Not your product? Sort by: Updated Date Popularity 4 Results 1. 10/09/2014 How do I clean white or black spots on printed documents? 2. 18/06/2014 How can I improve poor print quality ? 3. 07/05/2009 How do I clear vertical lines or streaks that appear in the copies I make? 4. 21/11/2005 How can I improve the copy quality? More FAQs Copy FAQs & Troubleshooting