Quantcast Pictorial  Diagram

the circuit diagrams before you begin troubleshooting; this simplifies the task of isolating the trouble. When a circuit fails to function, you should use the logic diagram   approach   to   locate   the   fault.   The trial-and-error method of locating the fault(s) in a circuit is  inefficient  and  time-consuming.  If  you  have  not  been trained  in  electricity,  you  should  read  the  Navy Electricity and Electronics Training Series (NEETS) Modules, particularly modules 2, 3, and 4. If you already  possess  knowledge  about  reading  diagrams,  the NEETS Modules can help you "get up to speed." Once you understand electrical diagrams, know prescribed maintenance and trouble-shooting procedures, and can use a voltmeter, you should be able to analyze and locate most of the faulty electrical components in imaging equipment. When working with electricity, Sailors commonly refer to all electrical diagrams as "schematics." This, however, is not correct. A schematic is a specific type of diagram with characteristics of its own and with a specific purpose. Each of the different diagrams has a specific purpose and has distinguishable features that set it apart from the others. These diagrams may be used to  do  the  following: learn the operation of a specific system locate the components of a system identify the components of a system trace a circuit troubleshoot  equipment repair  equipment Pictorial  Diagram The  simplest  of  all  diagrams  is  the  pictorial diagram. The pictorial diagram is a picture or sketch of the components of a specific system and the wiring between  these  components.  This  simplified  diagram identifies  components,  even  if  you  are  not  familiar  with their appearance. This type of diagram does not show physical locations of components or the manner in which the wiring is marked or routed. It does, however, show you the sequence in which the components are connected (fig. AII-1). After studying the pictorial diagram,  you  should  recognize  the  components  and how they are connected to one another. Figure AII-1—Pictorial diagram of a pump assembly. Isometric Diagram The purpose of an isometric diagram is to help you locate a component within a system. This type of diagram shows you the outline of a processor, printer, or other piece of equipment. Within the outline, the various components of a system are drawn in their respective  (or  relative)  locations.  The  isometric diagram  also  shows  interconnecting  cables  running between components (fig. AII-2). Block  Diagram A block diagram (fig. AII-3) presents a general description of a system and its functions. This type of diagram  is  often  used  with  accompanying  text  material. A  block  diagram  shows  the  major  components  of  a system and the interconnections of these components. All components are shown in block form and each block is labeled for identification purposes. Single-Line   Diagram The  single-line  diagram  (fig.  AII-4)  is  used basically for the same purpose as the block diagram. When the single-line diagram is used with text material, it provides you with a basic understanding of the components and their functions in a system. There  are  two  major  differences  between  the single-line diagram and the block diagram. The first difference is that the single-line diagram uses symbols, rather than labeled blocks, to represent components. Second,  the  single-line  diagram  is  just  that—all components are shown in a single line. There are no AII-3


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