43967002TH Rev.1 85 /Oki Data CONFIDENTIAL 3. Installation3.4.5 Duplex unit installation and removalThe duplex unit that enables the both-sided print is installed in the MC860 by default.Note! • For duplex print, addition of add-on memory is recommended. Fordetails, refer to Chapter 3 Installing the add-on memory.• The duplex unit that enables the both-sided print is installed in theMC860dn by default.1. Turn OFF the power of the main unit, and remove the powercord and printer cable.Turn OFF the power in accordance with the item 3.5.2 Turn OFF the power.Note! If the duplex unit is installed with the MFP power ON, the MFP maybe damaged.O IDuplex unitClaw2. Install the duplex unitInsert the duplex unit securely into thedeep end in the bottom on the back of theMFP.Confirm that the claws at both ends of theduplex unit are inserted into the printerholes securely.3. Connect the AC power cord and printer cable to the MFP. TurnON the power.Perform the menu map print according to the procedure of item 3.6.Confirm that “Duplex print: Installed” is displayed in the header.Note! If the “Duplex unit uninstalled” is displayed, re-install the duplex unit.O I4. Perform the menu map print to confirm that the duplex unit isnormally installed.