Troubleshooting The Mx960 Power System - Juniper MX960 Hardware Manual

Troubleshooting the MX960 Power System

Problem
Description: The power system is not functioning normally.
Solution
Check the LEDs on each power supply faceplate.
If an AC power supply is correctly installed and functioning normally, the AC OK and DC OK LED's
light steadily, and the PS FAIL LED is not lit.
If a DC power supply is correctly installed and functioning normally, the PWR_OK, INPUT OK, and
BREAKER ON LED's light steadily.
Issue the CLI show chassis environment pem command to check the status of installed power supply
modules. As shown in the sample output, the value Online in the rows labeled State indicates that each
power supply is functioning normally:
user@host> show chassis environment pem
PEM 0 status:
State
Temperature
DC output
PEM 1 status:
State
Temperature
DC output
If a power supply is not functioning normally, perform the following steps to diagnose and correct the
problem:
If a red alarm condition occurs, issue the show chassis alarms command to determine the source of the
problem.
Check that the AC input switch (—) or DC circuit breaker (|) is in the on position and that the power
supply is receiving power.
Verify that the source circuit breaker has the proper current rating. Each power supply must be connected
to a separate source circuit breaker.
Verify that the AC power cord or DC power cables from the power source to the router are not damaged.
If the insulation is cracked or broken, immediately replace the cord or cable.
Online
OK
OK
Online
OK
OK
667