Cisco WS-X4516-10GE Hardware Maintenance Manual - Page 82
Troubleshooting the Power and Cooling Systems
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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. 4-2 Cisco 4000 Series Hardware Installation and Maintenance