MFC-820CW FAQs & Troubleshooting MFC-820CW Not your product? Sort by: Updated Date Popularity 3 Results 1. 11/22/2011 When I print, the pages are smudged with ink. What should I do? 2. 08/29/2006 Why are my sent faxes always received with a black vertical line down the page? 3. 03/14/2006 One or more of my colors are not printing (blank). What can I do? Fax FAQs & Troubleshooting