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T.O. 31W2-2GSC24-2
TM 11-5805-688-14-1
NAVELEX 0967-LP-545-3011
CHAPTER 5
THEORY OF OPERATION
Example
Description
5-1.
INTRODUCTION.
U1, U2, Q5,
The reference  designations
5-2.
This chapter contains the principles of operation
etc.
used in this manual are the
for the circuits in the multiplexer set.  The chapter is
same as those that appear
divided into five sections. Section I contains discussions
on schematics and logic
of the output data message format and basic equipment
diagrams,
and
show
concepts used in the multiplexer set. The overall block
physical
locations
on
diagram discussions for the multiplexer, demultiplexer,
equipment
assembly
and diagnostic functions are in section II. Section III
drawings.
contains the block diagram discussions and detailed
theory of operation for the printed circuit cards in the
U1-6, U2-4,
Many microcircuit packages
multiplexer function. The block diagram discussions and
etc.
in this equipment contain
detailed theory of operation for the printed circuit cards in
multiple circuits: four AND
the demultiplexer function are in section IV. Section V
gates, two shift registers,
contains the block diagram discussions and detailed
etc. Therefore, when one or
theory of operation for the power supply.
more  circuits  within  one
package
need
to
be
5-3.
The reference designations for major circuit
identified, one of the input or
components, such as U1, Q5, etc, appear in the
output pins associated with
functional blocks in the block diagrams for the printed
the specific circuit being
circuit cards and power supply to assist in relating the
discussed is added to the
block diagram functional descriptions to the associated
reference  designation  for
detailed theory of operation discussions. The detailed
identification.  Normally, an
theory of operation discussions, in turn, reference the
output pin is used to identify
circuit reference designations as they appear on the
a particular circuit.
associated logic diagrams or schematics in the circuit
diagrams manual. The use of logic symbols in the block
MGCXX, DGCXX,
All functional signals in
diagrams is limited to simplified functional applications
MMFCX, DMFCX-
the equipment are assigned
that are best illustrated by the use of logic symbols.
names.
Initial letter  M
Complete logic circuits are not shown in the block
indicates
a
multiplexer
diagrams.
signal;
initial
letter
D
indicates  a  demultiplexer
5-4.
In the detailed circuit discussions, certain
signal. X or XX identifies a
conventions are used to describe and define logic
particular signal within a
elements.  These conventions are described by the
signal family; for example,
following examples.
MGCXX  consists  of  15
signals;  MGCO1  through
MGC15. The bar signal "-"
after
a
signal
name
indicates that the signal is
low in its true state.
5-1

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