IBM 390E manual Peripheral-Device-Related Symptom, Intermittent Problems

Symptom/Error			FRU/Action		in	Sequence
Battery		fuel-gauge	1.	Remove			Battery		ASM	and	let
does	not	go higher		it	cool		for	2	hours.
than	90%.		2.	Refresh battery (continue
				using battery in BIOS Setup
				mode until power off, then
				charge			battery).
			3.		Battery
			4.	DC/DC		&	Charger		board
			5.	System board
System	configuration		1.	Load		Setup		Defaults		and
does	not	match the		reboot			the	system.
installed		devices.	2. Reseat the Combobay ASM.
System	hangs		1.	Reseat			Hard Disk/Combobay
intermittently.				ASM.
			2.		Fan ASM
			3.		System board

Peripheral-Device-Related Symptom

Symptom/Error			FRU/Action		in Sequence
External		display	doesSystem		board
not	work	correctly.
USB does not work			System board
correctly.
Print	problems.		Ÿ	Run printer self-test.
			Ÿ	Printer driver
			Ÿ	Printer cable
			Ÿ	System board
Serial or parallel			portŸ	Device driver
device		problems.	Ÿ	Device cable
			Ÿ	Device
			Ÿ	System board

Note: If you	cannot	find a	symptom	or an error in this list
and the	problem	remains,	see	“Undetermined
Problems” on page 47.

Intermittent Problems

Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a hardware defect, such as cosmic radiation, electronic discharge, or software errors. FRU replacement should be considered

only when a recurring problem exists.

When analyzing an intermittent problem, do the following:

1.Run the advanced diagnostic test for the system board in loop mode at least 10 times.

2.If no error is detected, do not replace any FRUs.

46 ThinkPad 390E