NEC Server 140Rc-4 - Manual (Page 299)

Upgrading Your Server 9-13
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 three
power supply units in a redundant configuration, the failing power
supply unit can be replaced with the system operating (power-on state).
(Skip step 2.)
1. Check the POWER lamp on the power supply unit and determine which unit needs to be
replaced.
The lamp of the failing power supply unit is off.
2. Shutdown the system, and turn off the server.
3. Loosen the captive screw that retains the power supply unit.
4. While pressing down on the locking tab, grasp the handle and carefully pull the power
supply unit out of the power supply bay.
IMPORTANT: To avoid damaging the power supply unit, do not tilt
or twist the unit as you pull it from the power supply bay. The module
disengaging from its connector causes the initial resistance you will feel.
Use even, steady force to remove the unit.
POWER lamp
Screw
Handle
Locking tab