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called an electromechanical drawing is used. These
electrical prints as they represent more complex
drawings are usually simplified both electrically and
circuitry and systems.
mechanically, and only those items essential to the
Shipboard electronic prints include isometric
operation are indicated on the drawing.
wiring diagrams that show the general location of
electronic units and the interconnecting cable runs, and
elementary wiring diagrams that show how each cable
is connected. Also included among the common types
Logic diagrams are used to show the operation of
of shipboard electronic prints are block diagrams,
logic circuits in some IC equipment. They are used in
schematic diagrams, interconnection diagrams,
the operation and maintenance of digital computers.
electromechanical drawings, and logic diagrams.
Graphic symbols from American Standard Y32.14 are
The following paragraphs will discuss only those
used.
diagrams that were not discussed when we covered
Basic logic diagrams are used to show the operation
electrical prints.
of a particular unit or component. Basic logic symbols
are shown in their proper relationship to show operation
only in the most simplified form possible.
Interconnection diagrams show the cabling between
Detailed logic diagrams show all logic functions of
electronic units and how the units are interconnected.
the equipment concerned. In addition, they also include
All terminal boards are assigned reference designations.
such information as socket locations, pin numbers, and
Individual terminals on the terminal boards are assigned
test points to facilitate troubleshooting. The detailed
letters or numbers or both.
logic diagram for a complete unit may consist of many
separate sheets.
ELECTROMECHANICAL DRAWINGS
All input lines shown on each sheet of detailed logic
Electromechanical devices, such as synchros,
diagrams are tagged to show the origin of the inputs.
gyros, accelerometers, and analog computing
Likewise, all output lines are tagged to show destination.
In addition, each logic function shown on the sheet is
elements, are commonly used in IC equipment. For a
tagged to identify the function hardware and to show
complete understanding of these units, neither an
function location both on the diagram and within the
electrical nor a mechanical drawing would be
sufficient. Therefore, a combination type of drawing
equipment.
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