Data General AViiON 4600 Series, Customer Documentation

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6-1
014–002091
Chapter 6
Expanding and Maintaining Your
Computer System
This chapter contains procedures you should perform each time you replace a failed
system component or add new components to your system. It also describes some
procedures you might need to perform, such as installing configuration jumpers or
calculating power requirements, in the course of installing a new or replacement
device.
The first major section in this chapter, Maintaining Your System," outlines what you
should do if a problem occurs with your system hardware. The second major section,
Reviewing System Specifications," contains important instructions and worksheets
to help you plan the addition of any new system components. You need to follow the
directions in the third major section of this chapter, Avoiding Electrostatic Discharge
(ESD) Damage," each time you open your computer unit or unpack a new component.
Since installing a new or replacement device often requires that you set configuration
jumpers and switches on the device, the section Installing Board Jumpers and Setting
Switches" provides basic instructions for this procedure. The last sections of this
chapter explain how to open and close the computer unit.
NOTE: For information on the periodic maintenance of individual system
components such as tape, disk, and diskette drives, refer to the
device-specific manual for operating each drive listed in
Guide to
AViiON

and DG/UX

System Documentation .
Maintaining Your System
In general, you maintain your AViiON 530 or 4600 series system by simply replacing
any component that has failed. We refer to the subassemblies that you can easily
remove and install as
customer replaceable units, or simply CRUs .
The graphics and nongraphics consoles, cables, and other devices listed in Chapter 2,
Setting Up Your Computer System," are
external CRUs. You replace an external CRU
by simply disconnecting and reconnecting one or more cables. Refer to Chapter 2 for
the procedures for adding or replacing external CRUs.
Internal CRUs reside within your computer unit and include mass-storage devices,
the power supply, the fan assembly, memory modules, a CPU complex board, a
Z-buffer board, graphics boards, the system board, and an I/O expansion board. To
add or replace an internal CRU, you must remove the cover of the computer unit.
Chapter 4 Setting Up and Installing a SCSI Bus" describes how to add or replace
drives and subsystems connected to the SCSI A and SCSI B connectors on the rear of
your computer unit.