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Cisco 3600 Series Routers Hardware Installation Guide
OL-2056-05
Appendix A Troubleshooting
Isolating Problems
When problem solving, consider the following router subsystems:
• Power and cooling systems—External power source, power cable, router power supply and circuit
breaker, and router blower and fan. Also consider inadequate ventilation or air circulation.
• Modules—LEDs on the modules can help identify a failure.
• Cables—External cables that connect the router to the network.
Troubleshooting the Power and Cooling Systems
Both the system LED and the fans can help you troubleshoot a power problem. Check the following
items to help isolate the problem:
• With the power switch on, does the system LED stay on or blink?
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If the LED is green, the router is receiving power and is functional.
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If the LED is off, check the power source and power cable.
• With the power switch on and the system LED on, do the fans operate?
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If no, check the fans.
• With the power switch on and the system LED off, do the fans operate?
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If yes, the router is receiving power. The fans are connected directly to the DC outputs of the
power supply.
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If no, check the power source and power cable.
• Does the router shut down after being on a short time?
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Check for an environmentally induced shutdown. See the next section, “Environmental
Reporting Features.”
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Check the environmental site requirements in the “General Site Requirements” section on
page 2-3.
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Check for a power supply failure in the Cisco 3620 and Cisco 3640 routers by inspecting the
system LED on the front panel. If the system LED is on or blinking, the power supply should
be functional.
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Check for a power supply failure in the Cisco 3631 router by inspecting the system LED on the
front panel. If the system LED is on, the power supply is functional.
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Check for a power supply failure in the Cisco 3660 router by inspecting the system, PS1, and
PS2 LEDs on the front panel. If they are green, the power supplies are functional.
• Router partially boots, but LEDs do not come on.
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Check for a power supply failure by inspecting the system LED on the front panel of the router.
If the system LED is on, the power supply is functional.
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Check for a power supply failure in the Cisco 3660 router by inspecting the PS1 and PS2 power
supply LEDs on the front panel. For an explanation of these LEDs, see Table A-3.
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If the system LED is not on, refer to the warranty information in the quick start guide that
shipped with your router, or contact customer service. The quick start guide is also available
both on the Documentation CD-ROM and online.