IBM 8275 User Manual

Contents

Choosing a Troubleshooting ProcedureUse Table 4 to determine which troubleshooting procedure you should use. Unlessotherwise stated, references to the OK and Fault LEDs are those on the 8275-416 .Table 4. Troubleshooting— Isolating ProblemsSymtom and LED State ActionThe Fault LED, the OK LED are off, and the fan is notrunning.Go to “Procedure A”The Fault LED is On. If the Fault LED is blinking,diagnostics are in process.Go to “Procedure B”None of the devices connected to the 8275-416 cancommunicate , the Fault LED is Off and the Power (I)LED is On.Go to “Procedure C” on page 65A single device connected to the 8275-416 is havingtrouble communicating.Go to “Procedure D” on page 65A feature module Fault LED is On. Remove and replace the featuremodule.Note: The term “segment” refers to a single cable or interconnected cablesbetween a port and the device at the other end.Procedure AUse this procedure if all LEDs are Off:1. Verify that the ac power outlet to which the 8275-416 power supply is connectedis active. If an uninterruptible power supply (UPS) is being used to provide acpower, ensure that the UPS is working correctly.2. Verify that the power cord is installed correctly.3. If the preceding conditions are satisfied, the power supply is defective. See“Obtaining Service” on page 65.Procedure BUse this procedure if the Fault LED is On1. Reset the 8275-416 by disconnecting the power cord from the outlet, waiting 10seconds, and reconnecting the power cord to the outlet. If this corrects theproblem, resume using the 8275-416 .2. One or more bad feature modules can cause this symptom, and the remainingports might continue to operate.a. If you have feature modules, remove them.b. Reset the 8275-416 .c. If the 8275-416 comes up, reinstall the feature modules one at a time, andreset the 8275-416 to determine the failing feature module.3. If the problem is not corrected, the 8275-416 is defective. See “ObtainingService” on page 65.64 8275-416 User’s Guide