IBM 866631Y Hardware Maintenance Manual - Page 27
Light path diagnostics, Cause, Action
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LEDs. SMI NMI SP PCIA PCIB PCIC DASD1 MEM CPU VRM FAN TEMP NON OVER PS1 PS2 PS3 PS4 RED SPEC Light path diagnostics You can use the light path diagnostics built into the server to quickly identify the type of system error that occurred. Your server is designed so that LEDs remain illuminated when the server shuts down, as long as the power supplies are operating properly. This feature helps you to isolate the problem if an error causes the server to shut down. If the system error LED (on the information LED panel) is not lit and no diagnostics panel LEDs are lit, it means that the light path diagnostics have not detected a system error. If the system error LED (on the information LED panel) is lit, it means that a system error was detected. Check to see which of the LEDs on the diagnostics panel inside the server are lit and refer to the following table: Table 1. Light path diagnostics LED Cause Action None The system error log is 75% or Check the system error log and correct any more full; a PFA alert was problems. See "Choices available from the logged; or a failure occurred Configuration/Setup main menu" on page 31 on the I2C bus. for information about clearing the error log. Disconnecting the server from all power sources for at least 20 seconds will turn off the system error LED. SMI A systems management event Restart the server. occurred. NMI A nonmaskable interrupt occurred. The PCIA, PCIB, or PCIC LED will probably also be on. 1. If the PCIA, PCIB, or PCIC LED is not on, restart the server. If the problem persists, try to determine the failing adapter by removing one adapter at a time and restarting the server after each adapter is removed. SP The service processor has 1. Run service processor diagnostics. failed. 2. Replace Legacy I/O board. Diagnostics 17