General
Information
Introduction
Note
Hewlett -
Packard assumes no responsibility for customer repairs
or
modifications.
Chapter
1
This manual contains servicing information for the Hewlett-Packard (HP)
9000
Model
520
Computer (hereinafter referred to as the computer).
HP
supports repairing the computer to the
assembly level, that
is,
isolating the problem to the replaceable assembly. Then the defective
assembly
is
exchanged for a new or rebuilt assembly.
This chapter contains general information about the computer and
its
servicing.
Additional information
in
this manual includes:
• Theory of Operation
•
Troubleshooting Procedures
• Assembly Access Procedures
• Replaceable Parts
•
Data
Sheet
(Specifications
and
Options)
•
Installation
and
Test
• Error Messages
• Motherboard
and
liD
Backplane Pinout Data
• Option Installation Notes
• Sales
and
Support Offices
Note that the computer specifications
and
options are contained
in
Appendix
A.
Also, installation
information
is
not contained
in
this chapter but
is
found
in
Appendix
B.
Detailed servicing information
is
not provided for the following assemblies: 98770A Color Graphics
Display,
98780A Monochromatic Display, and 9130K Flexible
Disc
Drive. To service
one
of these
assemblies, refer to the appropriate manual listed
in
Table 1-1.
1-1
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