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Troubleshooting and Problem Solving
42 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
4.5 Troubleshooting
The following sections describe common problems, with possible solutions, which can occur
with your DCS9550 1S1 Storage Expansion Unit
4.5.1 System Faults
Note See also Section 4.5.5.
4.5.2 Power Supply/Cooling Faults
Symptom Cause Action
1 The SYSTEM LED will
illuminate AMBER on
the SCM
2 Audible Alarm sound
The ESI
processor has
detected an
internal fault (e.g.
failure of an
internal
communications
path)
1 Check for other AMBER LED indications on the
Power Supply/Cooling modules. If there is a
PSU error present there may be a
communications problem with that Power
Supply/Cooling module. Remove and then re-fit
the module, if the problem persists then change
the module.
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.
Symptom Cause Action
1 Ops Panel FAULT
LED AMBER
2 An AMBER LED on
one or more Power
Supply/Cooling
Modules.
3 Audible Alarm
Sounding.
1 Any power
fault.
2 A fan failure.
3 A thermal
condition
which could
cause PSU
overheating.
1 Check Power On/Off Switch on rear of Power
Supply/Cooling module is switched ON.(not
accessible on later models)
2 Check AC Mains Connections to Power Supply/
Cooling module is live.
3 Disconnect the Power Supply/Cooling module
from mains power and remove the module from
the system. Re-install: if problem persists,
replace Power Supply/Cooling Module.
4 Reduce the ambient temperature.