Troubleshooting The Mx960 Cooling System; Troubleshooting The Mx960 Dpcs - Juniper MX960 Hardware Manual

MX960 3D Universal Edge Router Hardware Guide

Troubleshooting the MX960 Cooling System

Problem
Solution
Related
Documentation

Troubleshooting the MX960 DPCs

Problem
490
Description: The fans in a fan tray are not functioning normally.
Follow these guidelines to troubleshoot the fans:
Check the fan LEDs and alarm LEDs on the craft interface.
If the red alarm LED on the craft interface lights, use the CLI to get information about
the source of an alarm condition:
If the CLI output lists only one fan failure, and the other fans are functioning normally,
the fan is most likely faulty and you must replace the fan tray.
Place your hand near the exhaust vents at the side of the chassis to determine whether
the fans are pushing air out of the chassis.
If a fan tray is removed, a yellow alarm and a red alarm occur.
The following conditions automatically cause the fans to run at full speed and also
trigger the indicated alarm:
A fan fails (red alarm).
The router temperature exceeds the "temperature warm" threshold (yellow alarm).
The temperature of the router exceeds the maximum ("temperature hot") threshold
(red alarm and automatic shutdown of the power supplies).
MX960 Alarm LEDs and Alarm Cutoff/Lamp Test Button on page 16
Replacing an MX960 Fan Tray on page 327
Maintaining the MX960 Air Filter on page 446
Maintaining the MX960 Fan Trays on page 446
Description: The DPCs are not functioning normally.
user@host> show chassis alarms
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