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In systems with a single DC-input power supply, and in systems with redundant power when both
power supplies are shutting down, the out fail LED goes on momentarily as the system ramps down,
but goes out when the power supply has completely shut down. In systems with redundant power
and one power supply still active, the out fail LED on the failed power supply will remain on
(powered by the active supply).
The DC-input power supply LEDs include the input power LED and the out fail LED.
(See Figure 13.) The green input power LED is on when the input power is applied. The yellow out
fail LED is normally off, but flashes at power on for a lamp test.
The out fail LED goes on if the power supply shuts down for either of the following reasons:
•
Power supply DC-output failure, which could be caused by loss of DC-input power (input line
failure or operator turned off system power) or an actual failure in the DC-input power supply
•
Power supply shutdown, initiated by the power supply because it detected an out-of-tolerance
temperature or voltage condition in the power supply
Figure 13
DC-Input Power Supply LEDs (Similar Location to the AC-Input Power Supply)
Always ensure that each power supply is fully seated in the bay and that the captive
Caution
installation screw is tightened before restarting the system. The captive installation screw provides
proper grounding and prevents the power supply from sliding out of the bay and dislodging from the
backplane power connectors.
When you turn the power supply on to power up the system, the green AC power LED on the power
supply should go on and remain on, and the DC fail LED should remain off. The AC power LED
will not go on if the power supply switch is not fully in the on (|) position, or if the power supply is
not properly seated in the bay, and the connectors are not making proper contact, or if the supply is
not receiving AC input power.
The yellow DC fail LED is normally off, but goes on if the power supply shuts down for either of
the following reasons:
•
Power supply DC section failure, which could be caused by loss of AC power (input line failure
or operator turned off system power), or an actual failure in the power supply
•
Power supply shutdown, which is initiated by the power supply because it detected an
out-of-tolerance temperature or voltage condition in the power supply
Cisco 7000 and Cisco 7507 Chassis Replacement Instructions
Verifying the Installation
27
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