IBM 43635gu Installation Guide - Page 86
System-board
UPC - 883436002950
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System-board LEDs The following illustration shows the LEDs on the system board. You might have to refer to this illustration when you are solving problems with the server. Note: The server does not contain a light path diagnostics panel. mini-BMC heartbeat LED Microprocessor fan error LED Standby power LED System fan error LED VRD power fault LED System power LED DASD fan error LED DIMM 1 error LED DIMM 2 error LED DIMM 3 error LED DIMM 4 error LED Use the system-board LEDs to diagnose system errors. An error LED is lit to indicate a problem with a specific component. After a problem is corrected, its LED will not be lit the next time that the server is restarted; if the problem remains, the LED will be lit again. For additional information, see the Problem Determination and Service Guide on the IBM System x Documentation CD. 72 System x3200 Type 4362 and 4363: Installation Guide