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Chapter 9
Maintain Hardware Components
This chapter describes how to maintain hardware co mpo n ents installed in the router. For
informatio
n about returning a part to Juniper Networks for repair or replacement, see
“Return the Router or Its C omponents” on page 163.
• Routine Maintenance Procedures on page 75
• Maintain th
e Fan Tray on page 75
• Maintain Packet Forwarding Engine Components on page 76
• Maintain the Power Supplies on page 78
• Maintain the Routing Engine on page 79
Routine Maintenance Procedures
For optimum router performance, perform the following preventive maintenance procedures
on a regular basis:
• Inspect the installation site for potential problems caused by moistu re, loose wires or
cables, and excessive dust. Make sure that airflow around the router is unobstructed.
• Check the LEDs on the craft interface and on hardware components. See “Craft
Interface” on page 14.
Maintain the Fan Tray
Thefantrayinstallsintotherearofthechassis,asshowninFigure3.Tocheckthestatusof
the fans in the fan t ray, issue the show chassis environment command. The output inclu des
an entry for each fan, as shown in this example:
user@host> show chassis environment
Class Item Status Measurement
...
Fans Left Fan 1 OK Spinning at normal speed
Left Fan 2 OK Spinning at normal speed
Left Fan 3 OK Spinning at normal speed
Left Fan 4 OK Spinning at normal speed
...
Maintain Hardware Components 75