MFC-8870DW FAQs & Troubleshooting MFC-8870DW Not your product? Sort by: Updated Date Popularity 3 Results 1. 11/15/2011 How do I install the Optional Tray Unit? 2. 10/05/2011 How do I install additional memory? 3. 03/10/2006 What kind of memory can I use? Consumables / Paper / Accessories FAQs & Troubleshooting