1. Installing Internal Optional DevicesExpress5800/R120g-2E User's Guide138Chapter 2 Preparations1.26.3 Replacing a failed power supply unitReplace only when the power supply unit fails.CAUTIONBe sure to observe the following precautions to use the server safely. Failure toobserve the precautions may cause burns, injury, and property damage. Fordetails, see Safety Precautions and Regulatory Notices.• Pay attention to electric hazard.Important Do not remove a power supply unit operating normally.1. Locate the failed power supply unit by the AC POWER LED on the power supply unit. The LED of thefailed power supply unit is lit amber or blinking amber.2. Power off the server.Tips In the redundant power configuration (with two power supply units) and if either one ofpower supply units fails, the failing power supply unit can be replaced with the systempower on.3. Disconnect the AC power cord from the failing power supply unit.4. Push the lever of the failed power supply unit toward inside, and pull the power supply unit while holdingthe handle.5. If operating the server with a single power supply unit without installing a new one, install the blank coverremoved in Step 2.Important To keep the cooling effect in the server, be sure to install the blank cover in thevacant slot.6. Install the new power supply unit taking steps 3 to 6 of "Installation", and confirm that the power supplyunit is installed normally.12
