Cisco 7500 Series Configuration Manual page 243

Chapter 8 Troubleshooting a Cisco 7500 Series Router
R E V I E W D R A F T — C I S C O C O N F I D E N T I A L
When you start up the system by turning on the main system power switch on the interface processor end
of the power supply, the following should occur:
The DC OK LED should go on immediately and 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:
–
–
–
If the AC or DC 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 RSP
(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, and then shut down after 2 minutes.
If there is a problem with any of the other DC lines, the RSP will not be able to initialize the system
software, so the system might attempt to start up and fail during the boot sequence.
Depending on when the DC OK LED goes off, proceed as follows:
–
–
–
–
• Immediately after you turn on the power switch, you should hear the fans operating. If you are in an
unusually noisy environment, such as an air-conditioned wiring closet with other equipment noise,
it might be difficult to hear the fans. In that case, 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.
OL-5008-03 B0
The power supply is on and the power source is providing either 100 to 240 VAC, 50 to 60 Hz
or –40 to –52 VDC in North America, or –56 to –72 VDC in the European Union.
The power supply is providing the +5, +12, –12, and +24 VDC to internal components.
All internal DC voltages are within tolerance.
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 DC source power or the DC power that is distributed to the internal
components. Proceed to the
page 8-7.
If the DC OK LED goes on temporarily and 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
Subsystem" section on page
If the DC OK LED goes on and the system starts up as expected but then displays the following
message and shuts down after 2 minutes, there is a problem with the fan tray. Proceed to the
"Troubleshooting the Cisco 7505 Cooling Subsystem" section on page
%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 2 minutes, there is a problem with the +24 VDC line to the fan tray.
Proceed to the "Troubleshooting the Cisco 7505 Power Subsystem" section on page
"Troubleshooting the Cisco 7505 Power Subsystem" section on
"Troubleshooting the Cisco 7505 Power
8-7.
Cisco 7500 Series Installation and Configuration Guide
Troubleshooting Guidelines for the Cisco 7505
8-7.
8-7.
8-5