HL-4070CDW FAQs & Troubleshooting HL-4070CDW Not your product? Sort by: Updated Date Popularity 3 Results 1. 30/01/2014 How do I install the Optional Tray Unit? 2. 09/01/2007 What kind of memory can I use? 3. 09/01/2007 How do I install additional memory? More FAQs Consumables / Paper / Accessories FAQs & Troubleshooting