Intel SR1550AL User Guide - Page 30
Intel, Light Guided Diagnostics - cpu
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Intel® Light Guided Diagnostics The server board contains diagnostic LEDs to help you identify failed and failing components, and to help you identify the server from among several servers. Except for the ID LED, the status LED, and the 5V standby LED, the LEDs turn on (amber) only if a failure occurs. B A C POST Code LEDs Light Guided Diagnostics Legend A through N DE FGH I J K A. POST Code LEDs B. ID LED C. Status LED D. DIMM A1 Fault E. DIMM A2 Fault N F. DIMM B1 Fault DIMM A1 DIMM A2 DIMM B1 DIMM B2 DIMM C1 DIMM C2 DIMM D1 DIMM D2 G. DIMM B2 Fault H. DIMM C1 Fault I. DIMM C2 Fault J. DIMM D1 Fault K. DIMM D2 Fault L L. CPU 1 Fault M M. CPU 2 Fault N. 5V Standby CPU 2 CPU 1 Socket Socket Figure 6. Light Guided Diagnostic LEDs AF000644 10 Intel® Server System SR1550AL/SR1550ALSAS User's Guide