MFC-6890CDW FAQs & Troubleshooting MFC-6890CDW Not your product? Sort by: Updated Date Popularity 3 Results 1. 15.12.2014 One or more of my colors are not printing (blank). What can I do? 2. 24.05.2011 Why are the faxes I send always received with a black vertical line down the page? 3. 24.04.2009 When I print, the pages are smudged with ink. What should I do? Fax FAQs & Troubleshooting