Chapter 5. Replacing components
This chapter contains information about replacing a controller, bezel, filter and filter
retainer, E-DDM CRU, power supply and fan unit CRU, dc power supply and fan
unit CRU, battery unit, SFP module, and midplane.
Attention: Always replace a failed component as soon as possible. The Recovery
Guru menu function in the DS4700 Express Storage Subsystem identifies failed
components.
Handling static-sensitive devices
Attention: Static electricity can damage electronic devices and your system. To
avoid damage, keep static-sensitive devices in their static-protective packages until
you are ready to install them.
To reduce the possibility of electrostatic discharge, observe the following
precautions:
v Limit your movement. Movement can cause static electricity to build up around
you.
v Handle the device carefully, holding it by its edges or its frame.
v Do not touch solder joints, pins, or exposed printed circuitry.
v Do not leave the device where others can handle and possibly damage the
device.
v While the device is still in its static-protective package, touch it to an unpainted
metal part of the storage subsystem for at least two seconds. This drains static
electricity from the package and from your body.
v Remove the device from its package and install it directly into your storage
subsystem without setting it down. If it is necessary to set the device down, place
it in its static-protective package. Do not place the device on your storage
subsystem cover or any metal surface.
v Take additional care when handling devices during cold weather because heating
reduces indoor humidity and increases static electricity.
Service Action Allowed Status LED
Each controller, power supply and fan unit, and battery unit has a blue Service
Action Allowed status LED. The purpose of the Service Action Allowed status LED
is to help ensure that a component is not removed before it is safe to do so. Do not
remove any storage subsystem component unless the component's Service Action
Allowed status LED is lit.
© Copyright IBM Corp. 2010 145
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