rear of the printer rear of the printer The components located at the rear of the printer are: 1. Tray 1 - Must be removed to install the optional multipurpose tray. 2. EIO slots - Install an HP JetDirect print server in this slot (HP JetDirect comes by default with the hp business inkjet printers 3000n and 3000dtn). 3. DIMM cover - Install extra memory here. 4. USB port - Connect the USB cable to this port. 5. Parallel port - Connect the parallel cable to this port. 6. Power input - Attach the power cord. tour the product hp restricted 1-17