MFC-7840W FAQs & Troubleshooting MFC-7840W Not your product? Sort by: Updated Date Popularity 3 Results 1. 12/16/2014 How do I make my copied images look sharper and more vivid? (Copy Contrast) 2. 05/15/2013 How do I clean white or black spots on printed documents? 3. 05/09/2013 How do I clear vertical lines or streaks that appear in the copies I made? Copy FAQs & Troubleshooting