4-2 Cisco 4000 Series Hardware Installation and Maintenance
Problem Solving
When problem solving, consider the following subsystems of the router:
• Power system—This subsystem includes the power supply and the wiring.
• Cooling system—The blower assembly should go on when power is applied.
• Network processor modules—Problems with these modules can be the most difficult to
troubleshoot. The LEDs on the network processor modules can be used to help identify a failure.
For complete information on LED indicators, refer to the section “Reading Front-Panel LED
Indicators” later in this chapter.
• System cables—This subsystem includes all of the external cables that connect the router to the
network.
Troubleshooting the Power and Cooling Systems
Check the following items to help isolate the problem:
• With the power switch on, does the blower operate?
— If yes, the AC input checks out.
— If no, suspect the AC input, AC source, router circuit breaker, or the power supply cable.
• With the power switch on and system LEDs lit, do the fans operate?
— If no, suspect the fans.
• Does the system shut down after being on a short time?
— Suspect an environmentally induced shutdown.
— Check the environmental site requirements in the section “General Site Requirements” in the
chapter “Preparing for Installation” and ensure that the chassis intake and exhaust vents are
clear.
— Suspect a power supply failure.
• System partially boots, but LEDs do not light.
— Suspect a 5-volt (V) power supply failure.
Troubleshooting the Network Processor Modules and Cables
Check for the following symptoms to help isolate the problem:
• Network processor module is not recognized by the system.
— Check the network processor module connection to the motherboard connector.
— Check the LEDs on the network processor module.
• Network processor module is recognized, but interface port(s) will not initialize.
— Check the motherboard connection.
— Check the external cables for connection.
• System will not boot properly or constantly/intermittently reboots.
— Check the network processor module connection to the motherboard.
— Suspect the processor or software.
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