Juniper TX MATRIX Hardware Manual page 247

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NOTE: On the display and in the CLI, the power supplies are referred to as
PEM0 and PEM1
If a power supply is not functioning normally, perform the following steps to diagnose
and correct the problem:
If the power supply LED is off, check the red alarm LED on the craft interface.
DC OK
The Junos OS monitors the system temperature, and if it exceeds a certain limit, the
software triggers a red alarm, a condition that shuts down the power supplies.
If a red alarm condition occurs, check the display on the craft interface to determine
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 DC OK power supply LED is off and no red alarm condition exists, check that the
circuit breaker is switched to the on position (
Verify that the source circuit breaker has the proper current rating. Each input on each
power supply must be connected to a separate power source.
Verify that the power cables from the power source to the TX Matrix router are not
damaged. If the insulation is cracked or broken, immediately replace the cable.
Connect the power supply to a different power source with a new power cable. If the
power supply LED still does not light, the power supply is the source of the
DC OK
problem. Replace the power supply with a spare.
If the LED on the installed spare lights, the replaced power supply is faulty, and
DC OK
you should return it for replacement, as described in "Returning a TX Matrix Router or
Component" on page 350.
If the LED on one of the power supplies lights, check the fans and air filters
OVER TEMP
to be sure they are functioning and providing sufficient airflow through the chassis.
If you cannot determine the cause of the problem or need additional assistance, see
"Contacting Customer Support" on page 349.
TX Matrix Craft Interface Overview on page 34
Replacing a TX Matrix Two-Input 160-A DC Power Supply on page 269
Replacing a TX Matrix Three-Input 240-A DC Power Supply on page 275
Chapter 23: Troubleshooting TX Matrix Hardware Components
, from top to bottom.
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