Data General AViiON 5500 Series, Installing, Expanding, And Maintaining

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Maintaining your system
4-2
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If you cannot resolve the problem yourself, contact Data General as
described in the Preface. If the Data General Service Center
determines that a CRU needs replacement, they will send the new
part.
Replacing CRUs
The cables and devices listed in Chapter 2 are external CRUs. You
replace an external CRU by disconnecting and reconnecting one or
more cables. Refer to Chapter 2 for the procedures for adding or
replacing external CRUs.
Internal CRUs are base components and system options that reside
within your computer unit; they include
D
mass–storage devices
D
the system board,
D
the power supply
D
the fan assembly,
D
memory modules
D
an optional expansion CPU complex board
D
a graphics controller (AViiON 550 only)
D
optional I/O expansion boards.
To add or replace an internal CRU, you must remove the cover of
the computer unit.
Chapter 3 describes how to add or replace drives and subsystems
connected to the SCSI connectors on the rear of your computer unit.
CAUTION: Before attempting to replace or add a CRU, read the section in this
chapter on “Avoiding Electrostatic Discharge (ESD) Damage” so that
you do not damage the replacement or add–on CRU.