Cisco 7206VXR Installation Guide - Page 127

Chapter 6 Troubleshooting the Installation Troubleshooting Overview Using a Subsystems Approach to Problem Solving The key to solving problems with the system is isolating the problem to a specific subsystem. The first step in solving startup problems is to compare what the system is doing to what it should be doing. Because a startup problem is usually caused by a single component, it is more efficient to first isolate the problem to a subsystem rather than troubleshoot each component in the system. For these troubleshooting procedures, consider the following subsystems: • Power subsystem-This subsystem comprises the power supplies, the external power cable, and the midplane. • Cooling subsystem-The chassis fan tray is the single component in this subsystem. The fans should be operating whenever system power is on. Replace the fan tray if you determine a fan is not functioning properly. • Processor subsystem-This subsystem includes the I/O controller, network processing engine, and all port and service adapters. The system memory and management functions reside on the I/O controller and the network processing engine. The enabled LED on each port and service adapter indicates if the adapter is initialized. An adapter that is partially installed in the midplane can cause the system to hang and crash. The following sections will help you isolate a problem to one of these subsystems and direct you to the appropriate troubleshooting section. Identifying Startup Problems Startup problems are commonly due to the source power or to a board (network processing engine, I/O controller, or port or service adapter) that is dislodged from the midplane. Although an overtemperature condition is unlikely at initial startup, the environmental monitoring functions are included in this chapter because they also monitor internal voltages. When you start up the Cisco 7206 for the first time, you should observe the startup sequence described in Chapter 3, "Installing the Cisco 7206," the "Starting the Cisco 7206" section on page 3-24. This section contains a more detailed description of the normal startup sequence and describes the steps to take if the system does not perform that sequence as expected. With the exception of the fan tray and network processing engine, LEDs indicate all system states in the startup sequence. By checking the state of the LEDs, you can determine when and where the system failed in the startup sequence. Use the following descriptions to isolate the problem to a subsystem, and then proceed to the appropriate sections to try to resolve the problem. When you start up the system by turning on the power supply switch, the following should occur: • You should immediately hear the fans operating. If not, proceed to the "Troubleshooting the Cooling Subsystem" section on page 6-7. If you determine that the power supply is functioning normally and that a fan is faulty, contact a customer service representative. If a fan does not function properly at initial startup, there are no installation adjustments that you should make. • The power supply's green power OK LED (at the rear of the chassis) should come on immediately when you place the power supply switch in the on (|) position, and remain on during normal system operation. If the green power OK LED does not come on, proceed to the "Troubleshooting the Power Subsystem" section on page 6-5. • The LEDs on the I/O controller should come on as follows: OL-5102-02 Cisco 7206 Installation and Configuration Guide 6-3