Components - Juniper mx240 Hardware Manual

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Copyright © 2016, Juniper Networks, Inc.
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
the source of the problem.
If all power supplies have failed, the system temperature might have exceeded the
threshold, causing the system to shut down.
NOTE: If the system temperature exceeds the threshold, 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 supplies provide power to the
router, and you can still view the system status through the CLI or display.
Check that the AC input switch (
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.
Connect the power supply to a different power source with a new power cord or power
cables. If the power supply status LEDs indicate that the power supply is not operating
normally, the power supply is the source of the problem. Replace the power supply
with a spare.
MX240 AC Power Supply Description on page 86
MX240 DC Power Supply Description on page 88
Troubleshooting Resources for MX240 Routers on page 377
Replacing an MX240 AC Normal-Capacity Power Supply on page 315
Replacing an MX240 DC Normal-Capacity Power Supply on page 318
Chapter 30: Troubleshooting Components
show chassis alarms
) or DC circuit breaker (
| —
command to determine
) is in the on position and
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