Juniper E Series Hardware Manual page 123

Table 12: Normal Activity of Functional Status LEDS During Booting (continued)
If the system detects an error during booting, the FAIL LED turns on. Some
failure conditions may cause the board not to boot. In this case, the LEDs
may all be off. The system should then reset the board.
If the operational software detects an error, the FAIL LED turns on. Some
errors may cause a board reset. Crash information can be displayed from
the console and is printed to the screen on the next reboot.
Table 13: Troubleshooting Abnormal LED Activity on Modules
Diagnostic Signs
POWER A OK is not lit
POWER B OK is not lit
FAIL LED lights
FAN OK does not light
FAN FAIL LED lights
OK FAIL
on
off
on
off
Possible Problems
System is not receiving power
from Power A.
System is not receiving power
from Power B.
The line module and I/O module
are incompatible.
A hardware failure, such as a
failed module.
Fan is not working properly or
has slowed down.
Fan needs replacement.
ONLINE
off
on
Actions
1. Check Power A and Power B
terminal connections.
2. Verify that power switches are on.
3.
Check connections to power
sources.
4.
If system still does not operate,
contact Juniper Networks Customer
Service.
1. Check that the line and I/O
modules are compatible; replace
if necessary.
2.
If you replaced the I/O module only,
issue the reload slot slot_number
command.
3. If you replaced the line module or
if there was a hardware failure, the
system should automatically reset
the module.
4. If condition persists, contact Juniper
Networks Customer Service.
Contact Juniper Networks Customer
Service; the system must be serviced.
Understanding Status LEDs to Troubleshoot
Troubleshooting
Status Process
3. Module passed
the diagnostics; the
system boots.
4. Module is now up
and running.
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