Troubleshooting M120 Febs - Juniper M120 Hardware Manual

Solution
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Troubleshooting M120 FEBs

Problem
Copyright © 2018, Juniper Networks, Inc.
If a red alarm condition occurs, issue the
the source of the problem.
NOTE: If the system temperature exceeds the threshold, the Junos OS
shuts down all power supplies so that no status is displayed.
The Junos OS also can shut down one of the power supplies for other
reasons. In this case, the remaining power supply assumes the load, and
you can still view the system status through the CLI or display.
If the power supply LED is off and no red alarm condition exists, check that the circuit
breaker on a DC power supply or power switch on an AC power supply is switched to
the on position ( | ).
Verify that the source circuit breaker has the proper current rating. Each power supply
must be connected to a separate source circuit breaker.
If the LED is blinking, verify that the input voltage to the power supply is within the
supply's operating range.
Verify that the power cord (AC) or power cables (DC) from the power source to the
router are not damaged. If the insulation is cracked or broken, immediately replace the
cord or cable.
Connect the power supply to a different power source with a new power cord or power
cables. If the power supply LED still does not light, the power supply is the source of
the problem. Replace the power supply with a spare, as described in
M120 Power Supplies" on page
If the LED on the installed spare lights, the replaced power supply is faulty, and you
should return it for replacement, as described in
to Juniper Networks, Inc." on page
If you cannot determine the cause of the problem or need additional assistance, see
"Troubleshooting Using the Juniper Networks Technical Assistance Center" on page
M120 AC Power Supply Description on page 72
M120 DC Power Supply Description on page 72
Replacing an M120 AC Power Supply on page 239
Replacing an M120 DC Power Supply on page 245
Definition of Safety Warning Levels on page 311
Description: The FEBs are not functioning normally:
Chapter 32: Troubleshooting Components
show chassis alarms
277.
"Returning a Hardware Component
305.
command to determine
"Maintaining the
284.
289