MFC-J4420DW FAQs & Troubleshooting MFC-J4420DW Not your product? Sort by: Updated Date Popularity 2 Results 1. 06/23/2014 One or more of my colors are not printing (blank). 2. 11/22/2010 The faxes I send are always received with a vertical black line. Fax FAQs & Troubleshooting