Cisco 7000 Series Hardware Installation And Maintenance Manual page 152

Identifying Startup Problems
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4-4 Cisco 7010 Hardware Installation and Maintenance
The DC OK LED should go on immediately, and it should remain on as long as the system is
receiving source power and the power switch is in the on (|) position. If this LED does not go on,
or if it goes off while the power switch is still on, there could be a problem with either the source
power, the internal DC power that the power supply distributes to the internal components, or the
cooling subsystem.
The green DC OK LED indicates the status of the power supply and internal DC voltages. The
DC OK LED stays on when all of the following conditions are met:
— AC-input power supply is on and receiving 100 to 240 VAC, 50 to 60 Hz source power
or the DC-input power supply is on and receiving –40 to –52 VDC (–48 VDC nominal) in
North America, or –56 and –72 VDC (–60 VDC nominal) in the European Community.
— Power supply is providing the +5, +12, –12, and +24 VDC to internal components.
— All internal DC voltages are within tolerance.
If the source power or any of the internal DC voltages exceeds allowable tolerances, the DC OK
LED will not go on, or will go off shortly after you turn on the power. Because both the RP
(which uses +5, +12, –12 VDC), and the fan tray (which uses +24 VDC) are required for
operation, a problem with any of the internal DC lines can prevent the system from starting up or
continuing operation.
For example, if there is a problem with the +24 VDC line that supplies the fan tray, the system
will start up but also recognize that the fans are not operating. The system will initiate a fan
failure shutdown sequence, display the appropriate warning messages, then shut down after two
minutes. If there is a problem with any of the other internal DC lines, the RP will not be able to
initialize the system software, so the system might attempt to start up and fail during the boot
sequence.
Depending upon when the DC OK LED goes off, proceed as follows:
— If the DC OK LED stays off (if it never goes on) when you turn on the power switch, there
is a problem with either the source power or the DC power that is distributed to the internal
components. Proceed to the section "Troubleshooting the Power Subsystem."
— If the DC OK LED goes on temporarily, then goes off within 30 seconds, the system is most
likely shutting itself down because it detected an out-of-tolerance power or temperature
condition within the power supply. Proceed to the section "Troubleshooting the Power
Subsystem."
— If the DC OK LED goes on, and the system starts up as expected but then displays the
following message and shuts down after two minutes, there is a problem with the fan tray.
Proceed to the section "Troubleshooting the Cooling Subsystem."
%ENVM-2-FAN: Fan array has failed, shutdown in 2 minutes
— If the DC OK LED stays off yet the system starts up correctly, displays the preceding
message, and shuts down after about two minutes, there is a problem with the +24VDC line
to the fan tray. Proceed to the section "Troubleshooting the Power Subsystem."
As soon as you turn on the power switch, you should immediately hear the fans operating. If you
are in an unusually noisy environment, such as an air-conditioned wiring closet with other
equipment noise, place your hand near the left side of the chassis (when facing the interface
processor end); you should feel the exhaust air that is being forced out the side of the chassis.
— If the DC OK LED is on but the fans are not operating, there is a problem with the fan tray
or with one of the fans. (The system will shut itself down if it detects that any of the fans are
not functioning properly.) Proceed to the section "Troubleshooting the Cooling Subsystem."