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CHAPTER 8
Troubleshooting
8-8
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.
Abnormal LED Activity
See Table 8-4 to diagnose and correct problems.
Table 8-3 Normal activity of functional status LEDS during booting
OK FAIL ONLINE Status Process
off on off 1 Module is in the power-up restart state; the FAIL
LED stays on briefly.
off off off 2 Module is initializing, and diagnostic tests are
running.
on off off 3 Module passed the diagnostics; the system boots.
on off on 4 Module is now up and running.
Table 8-4 Troubleshooting abnormal LED activity on modules
Diagnostic Signs Possible Problems Actions
• POWER A OK is not lit
• POWER B OK is not lit
• System is not receiving
power from Power A.
• System is not receiving
power from Power B.
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.
FAIL LED lights • The line module and I/O
module are incompatible.
• A hardware failure, such
as a failed module.
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.
• FAN OK 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.