IBM DCS9550 1S1 manual Troubleshooting, System Faults, Power Supply/Cooling Faults

Troubleshooting and Problem Solving

4.5Troubleshooting

The following sections describe common problems, with possible solutions, which can occur with your DCS9550 1S1 Storage Expansion Unit

4.5.1System Faults

Symptom	Cause	Action
1 The SYSTEM LED will	The ESI	1 Check for other AMBER LED indications on the
illuminate AMBER on	processor has	Power Supply/Cooling modules. If there is a
the SCM	detected an	PSU error present there may be a
	internal fault (e.g.
		communications problem with that Power
	failure of an
2 Audible Alarm sound		Supply/Cooling module. Remove and then re-fit
	internal
		the module, if the problem persists then change
	communications
		the module.
	path)
		2 Check for other AMBER LED indications on the
		drive carriers. If none are evident then there may
		either be an ESI processor problem or a
		Backplane problem.
		3 Ops Panel module faulty. Please contact your
		supplier.

Note See also Section 4.5.5.

4.5.2Power Supply/Cooling Faults

Symptom		Cause		Action
1	Ops Panel FAULT	1	Any power	1	Check Power On/Off Switch on rear of Power
	LED AMBER		fault.		Supply/Cooling module is switched ON.(not
					accessible on later models)
2	An AMBER LED on	2	A fan failure.
	one or more Power	3	A thermal	2	Check AC Mains Connections to Power Supply/
	Supply/Cooling				Cooling module is live.
	Modules.		condition
			which could	3	Disconnect the Power Supply/Cooling module
3	Audible Alarm		cause PSU		from mains power and remove the module from
	Sounding.		overheating.		the system. Re-install: if problem persists,
					replace Power Supply/Cooling Module.
				4	Reduce the ambient temperature.

42 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide