IBM 8872 Service Guide - Page 69
diagnostics
UPC - 000435813060
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v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See Chapter 3, "Parts listing, Type 8872 and Type 8874," on page 93 to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU). v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a trained service technician. Lit light path diagnostics LED with the system-error or system-information LED also lit Description Action CPU A microprocessor has failed, is missing, or has been improperly installed. Note: Make sure that the microprocessors are installed in the correct sequence; see "Removing and installing a microprocessor" on page 122. 1. Check the BMC log or the system-error log to determine the reason for the lit LED. 2. Find the failing, missing, or mismatched microprocessor by checking the LEDs on the microprocessor tray. 3. Reseat the following components: a. (Trained service technician only) Failing microprocessor b. Microprocessor tray 4. Replace the following components one at a time, in the order shown, restarting the server each time: a. (Trained service technician only) Failing microprocessor b. (Trained service technician only) Microprocessor tray VRM A dc-dc regulator has failed or is missing. 1. Check the BMC log or the system-error log to determine the reason for the lit LED (for a VRM). 2. Find the failing or missing VRM by checking the LEDs on the microprocessor tray. 3. Install any missing VRMs. 4. Reseat the following components: a. Failing VRM b. (Trained service technician only) Microprocessor associated with the VRM c. Microprocessor tray 5. Replace the following components one at a time, in the order shown, restarting the server each time: a. Failing VRM b. (Trained service technician only) Microprocessor associated with the VRM c. (Trained service technician only) Microprocessor tray LOG Information is present in the BMC 1. Save the log if necessary and clear it (see Error log and system-error log. One or Logs at "Configuration/Setup Utility menu choices" both logs might be full or almost full. on page 135). 2. Check the log for possible errors (see "Error logs" on page 18). Chapter 2. Diagnostics 53