A-6
Cisco 3600 Series Routers Hardware Installation Guide
OL-2056-05
Appendix A Troubleshooting
Reading Front-Panel LEDs
Note The Cisco 3660 router does not have the RPS LED described in Table A-2.
Note The power supply LEDs (PS1 and PS2) described in Table A-3 are found only on the Cisco 3660 router’s
front panel.
Table A-1 SYSTEM LED in Cisco 3620, Cisco 3640, and Cisco 3660 Routers
Color Description
Off Router is not receiving power.
Blinking green Router is running the ROM monitor. No errors detected.
Solid green Router is operating normally. No errors detected.
Amber Router is receiving power but not functioning properly. Possible power-on self-test
error or over-temperature condition detected.
Alternating
amber and green
Power-on self-test detected. The router is attempting to reload the ROM monitor.
Table A-2 RPS LED in Cisco 3620, Cisco 3640, and Cisco 3660 Routers
Color RPS Status
Off Not installed.
Blinking green RPS and the power supply are both operational. Because the router can accept
power from only one source, you can do either of the following:
• Unplug the power supply and use the RPS.
• Turn off the RPS and use the power supply. The RPS can remain connected.
Solid green Operational.
Amber Installed but not operational.
Table A-3 Power Supply LEDs in Cisco 3620, Cisco 3640, and Cisco 3660 Routers
Color Power Supply Status
Green Installed and operating correctly.
Amber Installed with fault conditions detected.
Blinking amber Thermal or out-of-range voltage protection shutdown.
Off Powered off or failed.
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