Juniper CBL-M40-PWR-AU Manual Do Utilizador
Troubleshoot the Fan Tray and Impeller Assemblies
M40 Internet Router Hardware Guide
198
Troubleshoot the Fan Tray and Impeller Assemblies
To troubleshoot the fan tray and impeller assemblies, follow these guidelines:
If the red alarm LED on the craft interface lights, check the LCD on the craft interface for
the source of the problem. The display reports the number of alarm conditions and the
source of each alarm. For a list of messages, see “Hardware and Interface Alarm
Messages” on page 192.
source of each alarm. For a list of messages, see “Hardware and Interface Alarm
Messages” on page 192.
Issue the following CLI command for more information about the source of an alarm
condition:
user@host> show chassis alarms
Issue the following command to check the status of the fans and impellers:
To check the status of the impellers and fans, issue the
show chassis environment
command. The output refers to the
Top
and
Bottom
impellers and to the individual fans
in the fan tray as the
Rear Left Fan
,
Rear Center Fan
, and
Rear Right Fan
:
user@host> show chassis environment
Class Item Status Measurement
Fans Top Impeller OK Spinning at normal speed
Bottom Impeller OK Spinning at normal speed
Rear Left Fan OK Spinning at normal speed
Rear Center Fan OK Spinning at normal speed
Rear Right Fan OK Spinning at normal speed
For further description of the output from the command, see the JUNOS Internet
Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and
Management.
Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and
Management.
Place your hand near the exhaust at the upper rear of the chassis to determine whether
the impellers and fans are expelling air.
If both power supplies have failed, the system temperature might have exceeded the
threshold, causing the system to shut down. See “All LEDs on Both Supplies are Off” on
page 205.
page 205.
If the LCD on the craft interface reports failure of only one impeller and the other
impellers are functioning normally, the impeller is probably faulty and needs to be
replaced. For replacement instructions, see “Maintain and Replace Cooling System
Components” on page 153. For instructions about returning a faulty component to
Juniper Networks, see “Return the Router or Its Components” on page 215.
replaced. For replacement instructions, see “Maintain and Replace Cooling System
Components” on page 153. For instructions about returning a faulty component to
Juniper Networks, see “Return the Router or Its Components” on page 215.
If one of the fan assemblies fails, look at the fan to determine whether the blades of the
fan are rotating. Individual blades are not distinguishable when the fan is rotating at
normal speeds.
normal speeds.