Cisco cBR Series Hardware Installation Manual page 264

Troubleshooting the Fan Module in the Cisco cBR
Problem
The RPLC LED of a fan is
illuminated with White light. Any
minor fan failure occurs. Any
sensor or any controller or PCB
fails.
The chip level thermal shutdown
alarms could be tripped. The cards
are powered off for thermal
protection shut down.
Cisco cBR's Supervisor Cards are
prevented from powering up.
The sliding door of the fan bay does
not close when the Fan Module is
removed.
The output of the show platform
command shows the Fan Module
(P10 to P14) in failed state.
The output of the show platform
command shows the Fan Module
(P10 to P14) in failed state.
Cisco Converged Broadband Routers Hardware Installation Guide
256
Possible Cause
The RPM of any fan is outside the
set RPM limit setpoints by less than
300RPM or greater than 1000RPM.
Temperature or barometric sensor
failure is sensed by the Supervisor.
The Supervisor could also set the
RPLC LED to White due to the
failure of a Fan Module hardware
component. It could also be a minor
alarm.
This scenario, considered a double
fault condition, occurs when there
is a fan failure during elevated
temperature conditions without all
the fans functioning properly. The
cards do not remain cool under
such conditions.
One or more of the Fan Modules
have a serious failure such that the
error prevents both fans from
operating. This could prevent the
Cisco cBR's Supervisor Cards from
powering up.
The chassis does not have one or
more Fan Modules.
The sliding door is stuck.
The Fan Module is not inserted.
The Fan Module has entered an
abnormal state.
Troubleshooting the Cisco cBR
Solution
Replace the Fan Module.
Replace the faulty Fan Module.
Replace the faulty Fan Module.
Push front flap open and manually
slide the door back and forth to
ensure free movement of the door.
If that doesn't work, pull the door
closed to stop air bypass until a fan
module is installed.
Insert the Fan Module.
Replace the Fan Module.