Replacing/Removing A Failing Power Supply Unit - NEC Express5800/T120h User Manual

Chapter 2 Preparations

Replacing/removing a failing power supply unit

Replace only when the power supply unit fails.
Be sure to observe the following precautions to use the server safely. Failure to observe the
precautions may cause burns, injury, and property damage. For details, refer to Safety Precautions
and Regulatory Notices.
●
1. Check the power supply unit whose AC POWER LED lights in amber or flashes.
2. Power off the server.
3. Disconnect the AC power cord from the failing power supply unit.
4. Push the lever of the power supply unit toward inside, and pull the power supply unit while holding the
handle.
5. If operating the server with a single power supply unit without installing a new one, install the blank cover
you removed in step 2 of installation procedure.
6. Install the new power supply unit taking steps 3 to 6 in Chapter 2 (1.26.1 Installing), and confirm that the
power supply unit is installed normally.
158
Pay attention to electric hazard.
Important
Do not remove a power supply unit operating normally.
Tips
In the redundant power configuration (with two power supply units) and if either one
of power supply units fails, the failing power supply unit can be replaced with the
system power on.
Important
To maintain the cooling effect in the server, be sure to install the blank cover
in the vacant slot.
Express5800/T120h User's Guide
CAUTION
1. Installing Internal Optional Devices