Juniper MX2010 Hardware Manual page 338

–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.
On the three-phase wye AC PDM, the left arrow (←) green LED is lit steadily, indicating that the left
input feed is receiving voltage.
On the three-phase wye AC PDM, the right arrow (→) green LED is lit steadily, indicating that the
right input feed is receiving voltage.
On the single-phase AC PDM, the green LED for each feed is lit steadily, indicating the input feed is
receiving voltage.
4. Verify that the source circuit breaker has the proper current rating. Each PDM must be connected to
a separate source circuit breaker. Check that the AC or DC circuit breaker is in the on (ON) position.
5. Verify that the DC power cable or the AC power cord from the power source to the router is not
damaged. If the insulation is cracked or broken, immediately replace the DC power cable or AC power
cord.
6. Connect the PDM to a different power source with new power cables. If the PSM PWR OK LED still
does not light, the PSM is the source of the problem. Replace the PSM with a spare.
If the PWR OK LED on the installed spare does not light, the replaced PSM might be faulty. To return
it for replacement, see
7. Check the status of a PSM, issuing the following CLI command. The value Online in the rows labeled
State indicates that each of the PSMs is functioning normally.
NOTE: For the MX2010, the PSMs are referred to as PSM0 through PSM8.
For the MX2020, the PSMs are referred to as PSM0 through PSM8 (bottom) and PSM9
through PSM17 (top).
Here is an example of the AC PSM input status for an MX2020:
"Contacting Customer Support" on page
"Mapping Input
731.
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