Juniper MX2010 Hardware Manual page 724

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.
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.
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.
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.
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.
PWR OK LED on PSMs is not lit—Check that the PSMs are inserted and are operating.
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.
–48V or 240 V China PDM LED is off—Check that the PDM is receiving voltage.
–48V or 240 V China PDM LED is lit red—Check that the PDM is connected to correct input voltage
and polarity.
NOTE:
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.
–48V or 240 V China LED on a DC PDM is not lit—Check that the input is receiving source DC power.
If a DC PDM is correctly installed and functioning normally, the –48V source input LEDs light green
steadily.
3. Check the LEDs on each AC PDM faceplate. There is one LED for each input feed. See
Power from AC Power Distribution Modules to AC Power Supply Modules on MX2000 Routers" on
page 185.
On the three-phase delta AC PDM, the left arrow (←) green LED is lit steadily, indicating that the
left input feed is receiving voltage.
On the three-phase delta AC PDM, the right arrow (→) green LED is lit steadily, indicating that the
right input feed is receiving voltage.
This does not apply to the 240 V China DC PDM.
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"Mapping Input