Juniper M Series Monitoring And Troubleshooting Manual page 350

M Series and T Series Routers Monitoring and Troubleshooting Guide
Check the Power Supply Power Switch
Purpose
Action
Check the Circuit Breaker
Purpose
Action
Perform a Power Supply Swap Test
Purpose
Action
Check the Router Cooling System
Purpose
306
Check the Router Cooling System on page 306
4.
Test the Power Supply on page 308
5.
To verify power supply failure by checking the power supply power switch.
If the OK power supply LED is off and no red alarm condition exists, check that the power
switch is .
ON
To verify power supply failure by checking the circuit breaker.
To check the circuit breaker:
Verify that the source DC or AC circuit breaker has the proper current rating. Each
1.
power supply in the router must be connected to a separate power source.
Make sure that the power switch is in the ON (|) position in the circuit breaker box for
2.
DC-powered routers. If the circuit breaker box has been tripped, reset it.
To verify a defective power supply by performing a swap test.
To perform a power supply swap test, follow the procedure in the appropriate router
hardware guide to remove the faulty power supply and connect it to a different source
with a new power cable. If the power supply does not power on, then the power supply
is the source of the problem. Return the faulty power supply for replacement, as described
in the appropriate router hardware guide.
CAUTION: When replacing a power supply, do not leave a slot empty for
more than two minutes while the router is operational. The power supply
must remain in the chassis for proper airflow.
WARNING: Do not touch the power connectors on the back side of the power
supply. They can contain dangerous voltages.
The power supplies require an unobstructed airflow.
If the LED on one of the power supplies lights, check that the airflow around
NO AIRFLOW
the power supply is sufficient.
Copyright © 2012, Juniper Networks, Inc.