Troubleshooting Power Issues; Ac Power Connection - Oracle X5-8 Service Manual

airflow through the server is disrupted and the cooling system fails to function properly causing
the server internal temperature to rise.
Action: Inspect the server front and back panel vents for blockage from dust or debris.
Additionally, inspect the server interior for improperly installed components or cables that can
block the flow of air through the server.
Prevention: Periodically inspect and clean the server vents using a vacuum cleaner. Ensure that
all components, such as cards, cables, fans, air baffles and dividers are properly installed.
Hardware Component Failure
Fan modules and power supply fans drive the server cooling system. When one of these
components fails, the server internal temperature can rise. This rise in temperature can cause
other components to enter into an over-temperature state. Additionally, some components,
such as processors, might overheat when they are failing, which can also generate an over-
temperature event.
To reduce the risk related to component failure, power supplies and fan modules are installed
in pairs to provide redundancy. Redundancy ensures that if one component in the pair fails, the
remaining component can continue to maintain the subsystem. For example, power supplies
serve a dual function; they provide both power and airflow. If one power supply fails, the other
functioning power supply is able to maintain both the power and the cooling subsystems.
Action: Investigate the cause of the over-temperature event, and replace failed components
immediately. For hardware troubleshooting information, see
Faults" on page 54.
Prevention: Maintain redundant systems and replace failed components immediately.

Troubleshooting Power Issues

If your server does not power on, the cause of the problem might be:
"AC Power Connection" on page 69
■
"Power Supplies (PSUs)" on page 70
■

AC Power Connection

The AC power cords are the direct connection between the server power supplies and the
power sources. The server power supplies need separate stable AC circuits operating at specific
Troubleshoot Hardware Faults
"Troubleshooting Server Hardware
Troubleshooting and Diagnostics 69