■ You can also gather information about the power supply by viewing the LEDs
on the front and the rear panels of the unit. If the power button and LED on the
front control panel is amber, one or both power supplies may be faulty. Check
the LEDs on the power supplies on the back of the unit to determine which
power supply is faulty. You can use the following procedure to verify that the
power supply is faulty.
To determine if one, or both, power supplies are faulty
1
On the rear panel, locate the power supply that has the amber LED.
2
Make sure that the other power supply functions properly.
3
Unplug the power cord from the power supply that has the amber LED.
4
Wait for 2 minutes or for 3 minutes, then plug in the power cord.
5
If the LED is still amber, replace the power supply.
Caution: The unit functions normally with one power supply. However, data
and operation is at risk if the second power supply fails. The faulty power supply
should be replaced as soon as possible.
Warning: To ensure that the unit does not overheat, do not operate the unit
with the power supply bay empty for more than a few minutes. Leave the failed
power supply in the bay until the replacement power supply is available.
If both power supplies have amber LEDs, shut down the unit and obtain
replacements.
You can find additional troubleshooting topics at the following:
See “Troubleshooting Hardware Issues” on page 91.
Troubleshooting system-induced shutdown
The power supplies are designed to enter protection mode when an electrical event
that is potentially catastrophic occurs. Such events include short-circuits, voltage
overloads, and power surges. In protection mode, the power supply shuts down or
locks up to protect itself and the component in the system.
When the unit is running, it may be turned off incorrectly or inadvertently. The control
panel in front of the unit may show a fault. The LEDs on the power supplies in the
rear of the unit may show a fault.
Possible causes include the following:
96Troubleshooting Hardware Issues
Troubleshooting system-induced shutdown
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