HL-4050CDN FAQs & Troubleshooting HL-4050CDN Not your product? Sort by: Updated Date Popularity 3 Results 1. 27.01.2014 How do I install the Optional Tray Unit? 2. 09.05.2013 How do I install additional memory? 3. 22.07.2009 What kind of memory can I use? Consumables / Paper / Accessories FAQs & Troubleshooting