Juniper Networks ERX Hardware 8 - Manual (Page 129)

Troubleshooting
Table 12: Normal Activity of Functional Status LEDS During Booting (continued)
OK FAIL ONLINE Status Process
on off off 3. Module passed
the diagnostics; the
system boots.
on off on 4. Module is now up
and running.
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 at the next reboot.
Table 13: Troubleshooting Abnormal LED Activity on Modules
Diagnostic Signs Possible Problems Actions
POWER A OK LED is not lit
POWER B OK LED is not lit
System is not receiving power
from Power A.
System is not receiving power
from Power B.
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 Juniper Networks Customer
Service.
FAIL LED lights The line module and I/O module
are incompatible.
A hardware failure, such as a
failed module.
1. Make sure that the line modules
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 is supposed to
automatically reset the module.
4. If the condition persists, contact
Juniper Networks Customer
Service.
FAN OK LED does not light
FAN FAIL LED lights
Fan is not working properly or
has slowed down.
Fan needs replacement.
Contact Juniper Networks Customer
Service; the system must be serviced.
Understanding Status LEDs to Troubleshoot 111