MFC-J450DW FAQs & Troubleshooting MFC-J450DW Not your product? Sort by: Updated Date Popularity 4 Results 1. 06/17/2014 How do I make my faxed documents lighter or darker? (Fax Contrast) 2. 06/05/2013 When I print, the pages are smudged with ink. 3. 04/26/2012 One or more of my colors are not printing (blank). 4. 11/22/2010 The faxes I send are always received with a vertical black line. Fax FAQs & Troubleshooting