HL-2700CN FAQs & Troubleshooting HL-2700CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 01/27/2014 How do I install the optional Duplex Unit? 2. 01/27/2014 How do I install the Optional Lower Tray Unit? 3. 01/27/2014 How do I install additional memory? Product Setup FAQs & Troubleshooting