MFC-9840CDW FAQs & Troubleshooting MFC-9840CDW Not your product? Sort by: Updated Date Popularity 3 Results 1. 27/02/2009 What kind of memory can I use? 2. 27/02/2009 How do I install additional memory? 3. 30/03/2007 How do I install the Optional Tray Unit? Consumables / Paper / Accessories FAQs & Troubleshooting