Chapter 5. Error Code to FRU IndexAttention: Start your activity in this chapter by going to “Checkpoint and Error Code Index” on page 162.In this section, you may be asked to perform additional isolation procedures before looking up the actionsfor a 4-character checkpoint or 8-character error code.The Error Code to FRU Index lists fault symptoms and possible causes. The most likely cause is listedfirst. Use this index to help you decide which FRUs to replace when servicing the system.v If you replace FRUs or perform an action and the problem is still not corrected, go to “MAP 1540:Problem Isolation Procedures” on page 110 unless otherwise indicated in the tables.v If you replace FRUs and the problem is corrected, go to ″MAP 0410: Repair Checkout″ in the RS/6000Eserver pSeries Diagnostic Information for Multiple Bus Systems.Note: Do not shut down the system if the FRU was replaced by hot-swap.Performing Slow BootOn this system, the error code displayed in the operator panel may not indicate the root cause of theproblem. To fully analyze all of the available information, perform the following steps before doing ahardware repair or replacement:1. Record the 8-character error code (and location code if present) in the operator panel.2. Power off the system using the white button. Refer to “Stopping the System” on page 282.3. Select slow boot mode (select disable fast boot) on the system power control menu from the serviceprocessor main menu.4. Do a slow-mode boot to the SMS menus. This boot can be specified using the System Power ControlMenu on the service processor main menu. Refer to “System Power Control Menu” on page 235. (Afast-mode boot skips much of the built-in diagnostic testing.) A slow-mode boot may yield a new8-character error code on the operator panel and new errors in the service processor error log. Poweron the system. Refer to “Starting the System” on page 283.v If a new error code is reported, use it in subsequent steps to continue problem analysis.v If the system hangs with the same error code, continue with the next step in the Checkpoints andError Codes Index.v If no 8-character error code is displayed in the operator panel, use the original error code andcontinue with the next step in the Checkpoints and Error Codes Index.5. Power off the system.6. At this point, the service processor menus should be available to examine the service processor errorlog.Confirming Initial Error CodeThe service processor may have recorded one or more symptoms in its error log. If the system hasattempted to boot since an error terminated normal operation, there may be specific fault information in theservice processor error log. Examine this error log before proceeding (see “System Information Menu” onpage 238).In the service processor error log, the most recent error is at the top of the list and the oldest error is atthe bottom. It is also important to look at the time stamp associated with each error. (The time stamps inthe service processor error log reflect coordinated universal time (UTC), which is also referred to asGreenwich mean time.)On this system, the error code displayed in the operator panel may not be indicative of the root cause ofthe problem. This is also true of the most recent error in the service processor error log.159
