Troubleshooting The Tx Matrix Cooling System; Troubleshooting The Tx Matrix Power System - Juniper TX MATRIX Hardware Manual

Troubleshooting the TX Matrix Cooling System

Problem
Solution
Related
Documentation

Troubleshooting the TX Matrix Power System

Problem
Copyright © 2010, Juniper Networks, Inc.
The following conditions automatically cause the fans to run at full speed and also trigger
the indicated alarm:
A fan fails (red alarm).
One of the fan trays is removed (yellow alarm).
The TX Matrix router temperature exceeds the "temperature warm" threshold (yellow
alarm).
The temperature of the TX Matrix router exceeds the maximum ("temperature hot")
threshold (red alarm and automatic shutdown of the power supplies).
To troubleshoot the fans:
If the red alarm LED on the craft interface lights, find the source of the problem by
looking at the display on the craft interface. The number of alarm conditions, as well
as the source of each alarm, appears on the screen.
Use the CLI to check the status of the fans. For example, you can issue the following
command to get information about the source of an alarm condition:
user@host> show chassis alarms scc
For information about the alarms, see Table 25 on page 210.
Place your hand near the exhaust vents at the rear of the chassis to determine whether
the fans are pushing air out of the chassis.
If the LED on one or both of the power supplies is not lit, check the power supply
DC OK
fans to see if they are operating.
If all power supplies have failed, the system temperature might have exceeded the
threshold, causing the system to shut down.
If the display on the craft interface lists only one fan failure and the other fans are
functioning normally, the fan is probably faulty and you need to replace the fan tray.
Replacing the TX Matrix Rear Fan Tray on page 237
The following alarms, LEDs, command output, and conditions indicate a problem with
the power system:
The yellow LED lights on the two-input 160-A power supply faceplate to
CB TRIP
indicate that the power supply detects a fault (the power supply fails, does not have
sufficient airflow, is going through a startup test, or is not properly inserted).
The blue DC OK LED blinks on the three-input 240-A power supply faceplate to indicate
that the power supply detects a fault (the power supply fails, does not have sufficient
airflow, is going through a startup test, or is not properly inserted).
Chapter 23: Troubleshooting TX Matrix Hardware Components
213