MFC-J870DW FAQs & Troubleshooting MFC-J870DW Not your product? Sort by: Updated Date Popularity 3 Results 1. 05/06/2013 When I print, the pages are smudged with ink. 2. 03/06/2013 One or more of my colors are not printing (blank). 3. 22/11/2010 The faxes I send are always received with a vertical black line. Fax FAQs & Troubleshooting