Juniper MX2010, Hardware Manual, Page: 337 / 825

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If all AC or DC power supply modules (PSMs) have failed, the system temperature might have exceeded
the threshold, causing the system to shut down. See Step 9 for instructions on how to restart a
high-capacity AC or DC PSM after a shut down due to an over-temperature situation.
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The yellow PWR OK LED blinks when an AC or a DC PSM is out of the power limit or is in an overcurrent
condition.
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The red FAULT LED lights when the PSM is not receiving enough airflow to maintain the proper
temperature.
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The red FAULT LED lights when the AC or DC output voltages are not within range.
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The yellow INP0 LED blinks when the AC or DC voltage is present, but out of limits. This LED blinks
continuously for approximately a few seconds on and a few seconds off.
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The yellow INP1 LED blinks when the AC or DC voltage is present, but out of limits. This LED blinks
continuously for approximately a few seconds on and a few seconds off.
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The red -48V LED lights when the wrong polarity of DC input voltage is connected on the DC PDM.
Solution
To troubleshoot the MX2000 router power system:
1. Check the LEDs on all AC or DC PSM faceplates.
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PWR OK PSM LED is blinking—Check the fans and air filters to be sure that they are functioning and
providing sufficient airflow through the chassis.
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PWR OK PSM LED is off and no red alarm condition exists—Check that the circuit breakers are
switched to the ON position. Check that the AC or DC power switch is in the on (|) position.
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PWR OK LED on PSMs is not lit—Check that the PSMs are inserted and are operating.
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If an AC PSM or a DC PSM is correctly installed and functioning normally, the PWR OK, INP0, and
INP1 LEDs light steadily, and the FAULT LED is not lit.
2. Check the LEDs on each DC power distribution module (PDM) faceplate.
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–48V or 240 V China PDM LED is off—Check that the PDM is receiving voltage.
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–48V or 240 V China PDM LED is lit red—Check that the PDM is connected to correct input voltage
and polarity.
NOTE: This does not apply to the 240 V China DC PDM.
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Check that the DC PDM switch is set to 60 A or 80 A depending on the current feed coming from
the DC source circuit breaker.
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