User`s guide

9-22 Upgrading Your Server
Replacing a Failing Power Supply Unit
Replace only a failing power supply unit.
IMPORTANT: Do not remove a power supply unit operating normally.
NOTE: If one power supply unit fails while the server contains two power supply units in a
redundant configuration, the failing power supply unit can be replaced while the system is running
(power-on state). (Skip step 2.)
1. Locate the failing power supply unit : the AC POWER LED on the rear of the power supply unit is lit amber.
2. Shut down the system, and press the POWER switch to turn off the power.
3. Disconnect the power cord from the failed power supply unit.
4. Hold the handle of the failing power supply unit.
5. While pressing the lever, pull the power supply unit to remove if from the chassis.
Lever
6. If you do not install a new power supply unit, install the cover you removed in step 3 of the installation procedure.
IMPORTANT: To maintain the cooling effect in the server, install the blank cover in the vacant
slot.
7. Install the new power supply unit following steps 4 to 8 of the installation procedure, and check that the power
supply unit is installed correctly.
NOTE: If one of the two power supply units of the server is replaced while the power is on, the
POWER LED of the new power supply unit goes on. (If it is replaced while the power is off, the
LED flashes. The LED goes on when the power is turned on.)