NOTE: If the system temperature exceeds the threshold, the Junos OS
shuts down all power supplies so that no status is displayed on the craft
interface.
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.
3. If a red alarm condition occurs, check the display on the craft interface to determine
the source of the problem.
4. If the DC OK LED is not lit on one or both of the power supplies,
• Check the power supply fans to see if they are operating.
• Check the red alarm LED on the craft interface. 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 no red alarm condition exists, verify that the circuit breaker on the two-input 180-A
DC power supply, three-input 240-A DC power supply, or four-input 240-A DC power
supply, or that the power switch on the AC power supply or six-input DC power
supply is switched to the on position (|).
5. Verify that the source circuit breaker is on and that the power supply is receiving
voltage. If the AC OK on AC power supplies or INPUT PRESENT LEDs on a three-input
240-A DC power supply or four-input 240-A power DC supply are not lit, it indicates
that the power supply is not receiving source power.
6. Verify that the source circuit breaker has the proper current rating. Each input on each
power supply must be connected to a separate circuit breaker.
7. 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
damaged cable or cord.
8. Connect the power supply to a different power source with a new DC power cable or
AC power cord. If the power supply DC OK LED still does not light, the power supply
is the source of the problem. Replace the power supply with a spare.
9. If the DC OK LED on the installed spare lights, the replaced power supply is faulty.
Return it for replacement, as described in “Returning a Hardware Component to Juniper
Networks, Inc.” on page 493.
10. If you cannot determine the cause of the problem or need additional assistance, see
“Contacting Customer Support” on page 483.
Copyright © 2017, Juniper Networks, Inc.478
T640 Core Router Hardware Guide
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