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System Faults; Power Supply/Cooling Faults - IBM DCS9550 1S1 Installation & Service Manual

Storage expansion unit
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Table of Contents
Troubleshooting and Problem Solving
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

Symptom
1 The SYSTEM LED will
2 Audible Alarm sound
4.5.2

Power Supply/Cooling Faults

Symptom
1 Ops Panel FAULT
2 An AMBER LED on
3 Audible Alarm
42
Cause
The ESI
processor has
illuminate AMBER on
detected an
the SCM
internal fault (e.g.
failure of an
internal
communications
path)
Note
See also Section 4.5.5.
Cause
1 Any power
LED AMBER
2 A fan failure.
one or more Power
Supply/Cooling
3 A thermal
Modules.
Sounding.
IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
Action
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.
Action
1 Check Power On/Off Switch on rear of Power
fault.
Supply/Cooling module is switched ON.(not
accessible on later models)
2 Check AC Mains Connections to Power Supply/
Cooling module is live.
condition
which could
3 Disconnect the Power Supply/Cooling module
cause PSU
from mains power and remove the module from
overheating.
the system. Re-install: if problem persists,
replace Power Supply/Cooling Module.
4 Reduce the ambient temperature.

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