Troubleshooting The M320 Fuses - Juniper M320 Hardware Manual

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Troubleshooting the M320 Fuses

Copyright © 2010, Juniper Networks, Inc.
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
OUTPUT OK
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 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 supplies assume the load, and
you can still view the system status through the CLI or display.
If the OUTPUT OK power supply LED is off and no red alarm condition exists, check
that the circuit breaker on a DC power supply or the power switch on an AC power
supply is switched to the on position (
Verify that the source circuit breaker has the proper current rating. Each power supply
must be connected to a separate source circuit breaker.
Verify that the power cord (AC) or power cables (DC) from the power source to the
router are not damaged. If the insulation is cracked or broken, immediately replace the
cord or cable.
Connect the power supply to a different power source with a new power cord or power
cables. If the power supply
the source of the problem. Replace the power supply with a spare, as described in
"Maintaining the M320 Power Supplies" on page 122.
If the LED on the installed spare lights, the replaced power supply is faulty,
OUTPUT OK
and you should return it for replacement.
If you cannot determine the cause of the problem or need additional assistance, see
"Contacting Customer Support" on page 281.
M320 Power System Description on page 33
Replacing M320 Power System Components on page 193
General Electrical Safety Warnings for M Series, MX Series, and T Series Routers on
page 231
The router uses fuses from the Cooper Bussman brand GMT series for the CB, SIBs, and
FPCs. The fuses are located in the rear of the midplane behind the power supply in slot
Chapter 12: Troubleshooting M320 Router Hardware Components
).
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LED still does not light, the power supply is
OUTPUT OK
133