Schematic Diagrams

Figure 6.11-Coder Indicator. Detail block diagram.

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Figure 6-10.—Shipboard TACAN system, simplified block diagram. Figure 6-11 shows how the code indicator section would appear in a detailed block diagram for the TACAN system shown in figure 6-10. Note that this diagram shows the shape and amplitude of the wave forms at various points and the location of test points. Tube elements and pin numbers are also identified. For example, the interrogation reply pulse (top left corner of fig. 6-11) is applied to the grid (pin 7) of V604B, and the output from the cathode (pin 8) of V604B is applied to the grid (pin 2) of V611. Therefore, this kind of block diagram is sometimes called a servicing block diagram because it can be used to troubleshoot as well as identify function operations. Block diagrams that break down the simplified diagram into enough detail to show a fairly detailed picture of functional operation, but do not include wave forms, test points, and so on, are usually called functional block diagrams. Graphic electrical and electronic symbols are frequently used in functional and detailed block diagrams of electronic systems to present a better picture of how the system functions. Note the graphic symbol for the single-pole, two-position switch S603 at the bottom left corner in figure 6-11. Figure 6-12 shows other examples of graphic symbols in a block diagram. Detailed block diagrams of the type shown in figure 6-12 can be used to isolate a trouble to a particular assembly or subassembly. However, schematic diagrams are required to check the individual circuits and parts. Schematic Diagrams Electronic schematic diagrams use graphic symbols from ANSI Y32.2 for all parts, such as tubes, transistors, capacitors, and inductors. Appendix III in this textbook shows common electronic symbols from this standard. Simplified schematic diagrams are used to show how a particular circuit operates electronically. However, detailed schematic diagrams are necessary for trouble- shooting. Figure 6-13 shows a section of the detailed schematic diagram of the coder indicator show in fig- ure 6-11. Some of the components in figure 6-13 are not numbered. In an actual detailed schematic, however, all components, such as resistors and capacitors, are identified by a letter and a number and their values are given. All tubes and transistors are identified by a letter and a number and also by type. Input signals are shown entering on the left (fig. 6-13) and signal flow is from left to right, which is the general rule for schematic diagrams. In the block diagram in figure 6-11, the north reference burst signal is shown applied to the pin 7 grid of V601B. The pin 6 plate output of V601B is fed to the pin 7 grid of V602, and the pin 3 cathode output of V602 6-12

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