User guide

Troubleshooting
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4.7 Dealing with Hardware Faults
Ensure that you have obtained a replacement module of the same type before removing any faulty module.
Warning If the Galaxy 55 subsystem is powered up and you remove any module, replace it immediately. If
the subsystem is used with modules or blanking plates missing for more than a few minutes, the
Enclosure can overheat, causing power failure and data loss. Such use will invalidate the
warranty.
• Replace a faulty drive with a drive of the same type and capacity.
• All drive bays must be fitted with either a Drive Carrier Module or a front dummy fascia in order to maintain
a balanced air flow.
• All the supplied plug-in power supply units, electronics modules and Blank plates must be in place for the air
to flow correctly around the cabinet.
4.8 Continuous Operation During Replacement
Depending on how the subsystem is set up, if a disk unit fails, it can normally be replaced without interrupting the
use of the system.
In addition, each enclosure can contain one, two or three power supply units, any of which can maintain power and
cooling to the subsystem while one of the others is replaced.
4.9 Replacing a Module
Please refer to Chapter 2 , ”Getting Started” for information on the initial installation of the plug-in modules in the
Galaxy 55 enclosure.
Warning Observe all conventional ESD precautions when handling Galaxy 55 modules and components.
Avoid contact with Backplane components and module connectors, etc.
4.9.1 Power Supply/Cooling Module
4.9.1.1 Removing the Module
Warning Do not remove the faulty Power Supply/Cooling module unless you have a replacement unit of the
correct type ready for insertion.
If a power supply unit or its fan is faulty, you must replace the whole power supply/cooling module.
If you have two or three power supply units installed, you can continue working while replacing the faulty module.
1 If you have more than one power supply unit installed, make sure you identify the faulty module correctly.
2 Remove the power cord from the faulty Power Supply/Cooling module.
3 Remove the earth screw and washer from the module front panel.
4 Release and hold the retention latch.
5 Grip the metal flange on the power supply unit front panel firmly between finger and thumb and slide the unit out
of the Enclosure bay (Figure 4–2).