Troubleshooting The Power And Cooling Systems; Normal Indications; Fault Indications; Problem Solving - Cisco 1841 - 3G Bundle Router Hardware Installation Manual
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Problem Solving
When solving problems, consider the following router subsystems:
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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:
Normal Indications
With the power switch on, the normal indications are:
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Fault Indications
Check the following symptoms to locate or eliminate faults in the power and cooling systems:
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Cisco 1800 Series Routers (Modular) Hardware Installation Guide
8-2
Power and cooling systems—External power source, power cable, router power supply, circuit
breaker, and router fan. Also check for inadequate ventilation or air circulation.
Interface cards—LEDs on the interface cards help identify a failure.
Cables—External cables that connect the router to the network.
SYS PWR LED on green and continuous
Fan operating
With the power switch on, is the SYS PWR LED on?
If the LED is green and continuous, the router is receiving power and is functional.
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If the LED is off, check the power source and power cable.
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With the power switch on and the SYS PWR LED on and green, does the fan operate?
If no, check the fan.
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If yes, the power system is functioning.
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With the power switch on and the SYS PWR LED off, does the fan operate?
If yes, the router is receiving power. The fan is connected directly to the DC outputs of the power
–
supply.
If no, check the power source and power cable.
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Does the router shut down after being on a short time?
Check for an environmentally induced shutdown. See the next section,
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Reporting Features, page
Check the environmental site requirements in the
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page
3-3.
Check for a power supply failure by inspecting the SYS PWR LED on the front panel. If it is
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green, the power supply is functional.
Router partially boots, but LEDs do not go on.
Check for a power supply failure by inspecting the SYS PWR LED on the front panel of the
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router. If the SYS PWR LED is blinking or continuously green, the power supply is functional.
If the SYS PWR LED is not on, see
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section on page
1-14.
Chapter 8
Troubleshooting Cisco 1800 Series Routers (Modular)
8-3."
"General Site Requirements" section on
"Cisco One-Year Limited Hardware Warranty Terms"
"Environmental
OL-5876-03
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Table of Contents
Troubleshooting
