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6–Diagnostics and Troubleshooting
Power-On Self-Test Diagnostics
6-2 ISR651101-00 J
Input Power LED is Off
The input power LED lights up to show that the router logic circuitry is receiving
proper voltages. If the input power LED is off, follow these steps:
Inspect power cord and connectors. Is the cord unplugged? Is the cord or
connector damaged?
Yes—Make necessary corrections or repairs. If the condition remains,
continue.
No—Continue.
Inspect AC power source. Is the power source delivering the proper voltage?
Yes—Continue.
No—Make the necessary repairs. If the condition remains, continue.
Replace the router.
System Fault LED is On
The system fault LED blinks a specific pattern to indicate the problem. If the
system fault LED lights up, take necessary actions (see “LED Blink Patterns” on
page 6-2).
Power-On Self-Test Diagnostics
The router performs a series of tests as part of its power-on procedure. The POST
diagnostic program performs the following tests:
Memory
FLASH validation
PCI device discovery
Management Ethernet port
LED Blink Patterns
The heartbeat and system fault LEDs show the operational status of the router.
When the POST completes with no errors, these LEDs blink at a steady rate of
once per second. When the router is in maintenance mode, the heartbeat and
system fault LEDs are on continuously.