Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual page 100

E120 and E320 11.1.x Hardware Guide
Table 11: Normal Activity of Functional Status LEDs During Booting
If the system detects an error during booting, the FAIL LED lights. Some failure
conditions can cause the module not to boot. In this case, the LEDs might all be off.
The system then resets the module.
If the operational software detects an error, the FAIL LED lights. Some errors can
cause a module reset. Crash information is displayed at the console on the next
reboot.
Table 12: Troubleshooting Abnormal LED Activity on Modules
Diagnostic Signs Possible Problems
POWER A (PA)
LED is not lit
POWER B (PB)
LED is not lit
FAIL LED lights
FAN OK LED
does not light
FAN FAIL LED
lights
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Understanding Status LEDs to Troubleshoot
OK FAIL ONLINE
off off off
off on off
on off off
on off on
System is not receiving power
from Power A.
System is not receiving power
from Power B.
The line module and IOA are
incompatible.
A hardware failure, such as a
failed module.
Fan is not working properly
or has slowed down.
Fan needs replacement.
Status Process
1. Module is in the power-up restart state; the FAIL LED
stays on briefly.
2. Module is initializing, and diagnostic tests are
running; the FAIL LED stays on briefly.
3. Module passed the diagnostics; the system boots.
4. Module is now up and running.
Actions
1. Make sure Power A and Power B terminal connections are
securely attached.
2. Verify that power switches are on.
3. Make sure connections to power sources are securely
attached.
4. If system still does not operate, contact the Juniper
Networks Technical Assistance Center.
1. Make sure that the line modules and IOAs are compatible;
replace if necessary.
2. If you replaced the IOA only, issue the reload slot
slot_number command.
3. If you replaced the line module or if there was a hardware
failure, the system is supposed to automatically reset the
module.
4. If the condition persists, contact the Juniper Networks
Technical Assistance Center.
Contact the Juniper Networks Technical Assistance Center; the
system must be serviced.
NOTE: In the fan tray for the E320 Broadband Services Router,
four of the eight fans turn on immediately upon initial power-up
and the other four fans turn on after a delay of 10 seconds.