MFC-790CW FAQs & Troubleshooting MFC-790CW Not your product? Sort by: Updated Date Popularity 3 Results 1. 16/09/2014 Why are the faxes I send always received with a black vertical line down the page? 2. 30/01/2014 One or more of my colours are not printing (blank). What can I do? 3. 02/06/2009 When I print, the pages are smudged with ink. More FAQs Fax FAQs & Troubleshooting