Replacing A Power Supply - NEC EXPRESS5800/120Rc-2 Service Manual

6. Connect the power cord to the input receptacle on the rear of the new power
supply and to the AC outlet.
7. Observe the green LED on the installed power supply is lit indicating the
supply is operational.
8. Close the system rack rear door.

Replacing a Power Supply

When a power supply unit fails, the red failure LED on the failed power supply
lights and the green LED on the failed power supply is extinguished. See Figure
2-19 for the location of the power supply LEDs.
If the optional power supply is not installed, power down the
system when replacing the power supply; if the optional
power supply is installed, a faulty power supply may be
removed without powering down the system.
1. Open the rear door of the system rack and swing the cable arm assembly
away from the system rear panel.
2. Power down the system if only one power supply is installed.
3. Disconnect the AC cable from the failed power supply unit.
4. At the rear panel loosen the thumbscrew (A) on the failed power supply
access door. Open the door. See Figure 4-34.
5. Grip the power supply handle and pull the power supply out from the rear of
the chassis.
6. Referring to Figure 4-35, slide the power supply into the chassis, close the
access door and tighten the thumbscrew (A) that secures the power supply
access door.
9. Connect the power cord to the input receptacle on the rear of the new power
supply and to the AC outlet.
10. Observe the green LED on the installed power supply is lit indicating the
replacement power supply is operational.
11. Close the system rack rear door.
4-32 Disassembly and Reassembly
! CAUTION