6–Diagnostics and TroubleshootingPower-On Self-Test Diagnostics6-2 ISR651101-00 G Inspect power cord and connectors. Is the cord unplugged? Is the cord orconnector damaged? Yes—Make necessary corrections or repairs. If the condition remains,continue. No—Continue. Inspect AC power source. Is the power source delivering the propervoltage? Yes—Continue. No—Make the necessary repairs. If the condition remains, continue. Replace the router.System Fault LED is OnThe system fault LED blinks a specific pattern to indicate the problem. If thesystem fault LED lights up, take necessary actions (see “LED Blink Patterns” onpage 6-2).Power-On Self-Test DiagnosticsThe router performs a series of tests as part of its power-on procedure. The POSTdiagnostic program performs the following tests: Memory FLASH validation PCI device discovery Management Ethernet portLED Blink PatternsThe 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 ofonce per second. When the router is in maintenance mode, the heartbeat andsystem fault LEDs are on continuously.All other system fault blink patterns show critical errors. The heartbeat LED showsan error blink pattern for the conditions listed in Table 6-1.Table 6-1. System Fault LED Blink PatternsSystem Fault LED ConditionOFF Okay, operational3 Blinks, followed by pause System error
