IBM 8872 Service Guide - Page 58
Microprocessor, problems
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UPC - 000435813060
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Microprocessor problems 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. Symptom Action The server emits a continuous beep during POST, indicating that the startup (boot) microprocessor is not working correctly. 1. Correct any errors indicated by the light path (see "Light path diagnostics" on page 49). 2. Make sure that all microprocessors are supported on this server, and that they all match in speed and cache size. 3. (Trained service technician only) Make sure that the microprocessor 1 is seated correctly. 4. Reseat the following components: a. (Trained service technician only) Microprocessor 1 b. Microprocessor VRM 3 or 4 c. Microprocessor tray 5. (Trained service technicians only) If there is no indication of which microprocessor has failed, isolate the error by testing with one microprocessor at a time. 6. Replace the following components one at a time, in the order shown, restarting the server each time. a. (Trained service technician only) Microprocessor 1 b. Microprocessor VRM 3 or 4 c. (Trained service technician only) Microprocessor tray 7. (Trained service technician only) If there are multiple error codes or light path diagnostics LEDs that indicate a microprocessor error, reverse the locations of two microprocessors to determine whether the error is associated with a microprocessor or with a microprocessor socket. If the error codes or LEDs indicate an error that is associated with microprocessor socket 3 or 4, reverse the locations of VRM 3 and VRM 4. v If the error is associated with a microprocessor, replace the microprocessor. v If the error is associated with a VRM, replace the VRM. v If the error is associated with a microprocessor socket, replace the microprocessor tray. 42 IBM xSeries 460 Type 8872 and xSeries MXE 460 Type 8874: Problem Determination and Service Guide
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