MFC-7840W FAQs & Troubleshooting MFC-7840W Not your product? Sort by: Updated Date Popularity 3 Results 1. 10/09/2014 How do I clean white or black spots on printed documents? 2. 13/09/2010 How do I make my copied images look sharper and more vivid? (Copy Contrast) 3. 24/01/2008 How do I clear vertical lines or streaks that appear on my copies? More FAQs Copy FAQs & Troubleshooting