AC450NX Rack Server System Product Guide
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WARNING: English (US)

The power supply in this product contains no user-serviceable parts. There may be more
than one supply in this product. Refer servicing only to qualified personnel.
Do not attempt to modify or use the supplied AC power cord if it is not the exact type
required.
The DC push-butto n on/off switch on the system does not turn off system AC power. To
remo ve AC power from the system, you must unplug each AC power cord from the wall
outlet or power supply.
SAFETY STEPS: Whenever you remove the chassis covers to access the inside of the
system, follow these ste ps:
1. Turn off all peripheral devices connected to the system.
2. T urn off the system by using the push-button on/o ff power switch on the system.
3. Un plug all AC power cor ds from the syst em or from wall outlets.
4. Label and disconnect all cables connected to I/O connectors or ports on the back of the
system.
5. Provide some electrostatic discharge (ESD) protection by wearing an antistatic wrist
strap attached to chassis ground of the system—any unpainted metal surface—when
handling components.
6. Do not operate the system with th e chassis covers removed.
After you have completed the six SAFETY steps above, you can remove the system covers.
To do this:
1. Remove and save all screws from the covers.
2. Remove the covers.
For proper cooling and airflow, always reinstall the chassis covers before turning on the
system. Opera ting the system wit hout the covers in place can damage syst em parts. To
install the covers:
1. Check f irst to make sure you have not le ft loose tools or parts inside th e system.
2. Check that cables, add-in boards, and other components are properly installed.
3. Attach the covers to the chassis with the screws removed earlier, and tighten them
firmly.
4. Connect all external cables and the AC power cord(s) to the system.
continued