System Housing0-15Upgrading to Two Redundant Power SupplyModulesFollow the instructions in this section when you want to upgrade totwo 420W redundant power supply modules.To reduce the risk of electric shock, makesure to disconnect all power supply cablesfrom the wall socket before opening thesystem housing.Removing the Existing Power Supply1. Unplug the AC power cable from the wall socket, then removethe plastic fan cover on the rear panel.2. Open and remove the lower front and left doors. See theOpening the Housing Panels section for more information.3. Remove the three screws that secure the right door.DO NOT open the RIGHT door at thismoment! Doing so will damage the powersharing board and cables attached to itsinner side.4. Unplug the connectors- from the power supply to the power sharing board- from the power sharing board to the system board- from the power sharing board to the disk drives- from the fans to the system boardRemember where you unplugged each connector. You will haveto reconnect them later.
