IBM 88631SU Service Guide - Page 69

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 8863, 7362," on page 107 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 60). 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 microprocessor, light path, or error codes that indicate a damaged microprocessor, switch two microprocessors to see if the error moves with the microprocessor or if it stays with the microprocessor socket. Note: For sockets 3 and 4, if the error stays with the socket, switch the VRM3 and VRM4. v If the error moved with the microprocessor, replace the microprocessor. v If the error moved with the VRM, replace the VRM. v If the error stayed at the same socket, replace the microprocessor tray. Monitor problems Some IBM monitors have their own self-tests. If you suspect a problem with your monitor, see the documentation that comes with the monitor for instructions for testing and adjusting the monitor. If you cannot diagnose the problem, call for service. Chapter 2. Diagnostics 53