Troubleshooting the Installation 5-9
Troubleshooting Overview
—If the AC INPUT OK LED (on the AC-input power supply) or the INPUT OK LED
(on the DC-input power supply) goes on, and the system starts up as expected but
then displays the following message and shuts down after 2 minutes, there may be
a problem with one of the fan trays.
%ENVM-2-FAN: Fan has failed, shutdown in 2 minutes
In this case, proceed to the section entitled “Troubleshooting the Cooling
Subsystem.”
—If the red OUTPUT FAIL LED goes on (when a failure occurs wi th a po wer s upply
of either type), yet the system starts up correctly, displays the preceding message,
and shuts down after about 2 minutes, there may a problem with the –48 VDC being
supplied to the chassis. In this case, proceed to the section entitled
“Troubleshooting the Power Subsystem.”
•When you turn on the rotary power switch, you should hear the fan trays come up to
normal rotational speed after about two seconds.
If background noise prevents you from hearing fan tray operation, place your hand at
the top rear of the router enclosure to determine if air is being exhausted from the fan
tray vents. You should feel a steady volume of air coming from these vents.
If the AC INPUT OK LED (AC-input power supply) or the INPU T OK LED (DC-input
power supply) is on, but the fan trays are not operating, there might be a problem with
the fan trays (or, possibly, the CSC, which powers the fan trays).
To check the operating voltage of the fan trays, issue either the show environment or
the show environment all command. (Either command displays information about the
system’s internal environment.) If the fan tray voltage is okay, the fan trays themselves
may be faulty. If the fan tray voltage is bad, there may be a problem with the CSC (which
supplies the fan tray operating voltages).
If the system detects that it is overheating due to a fan tray failure, it shuts itself down.
In this case, proceed to the section entitled “Troubleshooting the Cooling Subsystem.”
•When you turn on system power, the alphanumeric displays on the RP indicate the
following:
—The top display indicates which component is running.
—The bottom display indicates the current stage of the boot process.