Table of Contents
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THEORY OF OPERATION
3
INTROOUCTION
The theory of operation is organized into
the following 2 parts.
•
Subsection LA - Describes the operation
of the power supply and
m~jor
mechanical
assemblies.
•
Subsection lB - Describes the logical
functions and the signals exchanged
within the Controller.
Functional descriptions are frequently accom-
panied by simplified logic diagrams.
These
diagrams are useful both for instructional
purposes and as an aid in troubleshooting.
Figure 3-1 illustrates the logic symbology
used by the
illuatra~ions
in this manual.
The diagrams have been simplified to illu-
strate the principles of operation1 there-
fore, other elements may be omitted.
The
83318200
A
logic diagrams in the Maintenance manual
should take precedence over the diagrams in
this section whenever there is a conflict
between the two types of diagrams.
The descriptions are limited to drive opera-
tions only.
In addition, they explain
~~
operations and do not list variations or un-
usual conditions resulting from unique system
hardware or software environments.
Personnel
using this manual should already be familiar
with principles of operation of the computer
system, the controller, programming consider-
ations (including the correct sequencing of
I/O commands and signals), and track format
(i.e., data records and field organization).
The text will make liberal use of system and
drive abbreviations.
These abbreviations are
listed in Table 3-1.
3-1
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