MFC-7450 FAQs & Troubleshooting MFC-7450 Not your product? Sort by: Updated Date Popularity 3 Results 1. 16.12.2014 How do I make my faxed documents lighter or darker? (Fax Contrast) 2. 15.05.2013 How do I clean white or black spots on printed documents? 3. 14.01.2008 Why are the faxes I send always received with a black vertical line down the page? Fax FAQs & Troubleshooting