IBM 220 manual Diagnostic LEDs, Error LED on System board or Cause Action Front panel LED

Diagnostic LEDs

You can use the diagnostic LEDs built into your 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.

Error LED (on the	System board or	Cause	Action
system board or	front panel LED
front panel)	on
On	None	The system error log is 75% or more	Check the system error log and
A system error		full or a Predictive Failure Analysis	correct any problems. See “Choices
		(PFA) alert was logged.	available from the
was detected.			Configuration/Setup main menu” on
Check to see			page 12 for information about
which of the LEDs			clearing the error log. Disconnecting
on the system			the server from all power sources for
board are on.			at least 20 seconds will turn off the
			system error LED.
On	DIMM 1, DIMM 2,	A memory error occurred.	1. Check the DIMM error LEDs on
	DIMM 3, or		the system board.
	DIMM 4 (system		2. Replace the DIMM indicated by
	board)
			the lit DIMM error LED.
On	CPU 1 or CPU 2	One of the microprocessors has failed,	1. Check the microprocessor error
	(system board)	or a microprocessor is installed	LEDs on the system board. If a
		incorrectly.	microprocessor error LED is on
			for a microprocessor connector
			that has a terminator card
			installed instead of a
			microprocessor, the
			microprocessors are not installed
			in the correct order. See
			“Installing and removing a
			microprocessor” on page 54 for
			information about the correct
			order for installing
			microprocessors. Otherwise,
			continue with the next step.
			2. Turn off the server, reseat the
			microprocessor indicated by the
			lit microprocessor error LED, and
			restart the server.
			3. If the problem persists, replace
			the microprocessor.
			If the problem persists, have the
			system serviced.
On	Fan 1, Fan 2, or	One of the fans has failed or is	The LED on the failing fan will be lit.
	Fan 3 (system	operating too slowly.	Contact an IBM service technician to
	board)		replace the fan.

Table 15. Diagnostic LEDs

Chapter 6. Solving problems 99