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E120 and E320 11.3.x Hardware Guide
Troubleshooting Power Failures
Table 9: Causes of Power Failures
Symptom
Possible Problems
System does not
System is not receiving power.
power up.
Module's power supply has
malfunctioned.
Power source cannot handle
system load.
System shuts
Temperature is too high.
down.
Power is lost.
Understanding Status LEDs to Troubleshoot
LED Identification
78
The system's distributed power system is designed to consume low levels of power and
dissipate low levels of heat. See "System Specifications" on page 89 for specifications
of power consumption and heat dissipation. If you suspect a power problem, see Table
9 on page 78.
Module LEDs can show you the immediate status of a module and alert you to a problem
with the module or one of its ports. We recommend you familiarize yourself with LED
activity so that you can easily detect and correct a module-related problem with minimal
or no system downtime.
Most modules have two sets of status LEDs. The top set indicates basic functional status
of the router or module. The bottom set indicates system status for that module, such
as port status (line modules and IOAs) or fan status (SRP modules). See Figure 32 on
page 79 and Figure 33 on page 79 for LED locations and labeling. See Table 10 on page 80
for descriptions of LED activity for all modules and IOAs.
Actions
The following actions apply to all of the possible problems:
1.
Verify that all power connections are correct.
2. Verify that the power supply is delivering the correct voltage,
current, and wattage to the system. See "System Specifications"
on page 89.
3. If the system still does not operate, contact the Juniper Networks
Technical Assistance Center (JTAC).
The following actions apply to all of the possible problems:
1.
Verify that power connections are properly attached.
2. Verify that system is receiving power.
3. Look to see whether or not the LEDs are lit.
4. Run diagnostics on SRP and line modules.
5. If system does not reset, contact JTAC.
Copyright © 2010, Juniper Networks, Inc.
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Troubleshooting
