1. Installing Internal Optional DevicesExpress5800/R120e-1E User’s Guide 123Chapter 2 Preparations1.19.3 Replacing a Failing Power Supply UnitReplace only when the power supply unit fails. To remove a power supply unit, reverse the installationprocedure above.CAUTIONBe sure to observe the following precautions to use the server safely. Failure toobserve the precautions may cause burns, injury, and property damage. Fordetails, refer to Safety precautions in Precautions for Use.• Pay attention to electric hazard.Important Do not remove a power supply unit operating normally.1. Locate the failing power supply unit by the AC POWER LED on the rear of each power supply unit. (TheLED of the failing power supply unit is lit amber or blinking amber.)2. Shutdown the system, and press the POWER switch on the server to turn off the power.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 failed power supply unit.4. Push the lever of the failing power supply unit toward inside, and pull the power supply unit while holdingthe handle. Remove the power supply unit from the chassis.5. If operating the server with a single power supply unit without installing a new one, install the blank coveryou removed in step 2 of installation procedure.Important To maintain the cooling effect in the server, install the blank cover in the vacantslot.6. Install the new power supply unit taking steps 3 to 7 of "Installation", and confirm that the power supplyunit is installed normally.(1)(2)
