MFC-3100C FAQs & Troubleshooting MFC-3100C Not your product? Sort by: Updated Date Popularity 2 Results 1. 05/15/2013 How can I remove horizontal white lines and other flaws from documents printed on my Fax/MFC? 2. 08/24/2006 Why are my sent faxes always received with a black vertical line down the page? Fax FAQs & Troubleshooting