CHAPTER 5 THEORY OF OPERATION - TM-11-5805-688-14-10102

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

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

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

multiplexer

diagrams.

signal;

initial

letter

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

signal

name

indicates that the signal is

low in its true state.

5-1