System Functional Diagram

System Functional Diagram mally from left to right. All serial components of each piece of equipment in the loop that are significant to A system fictional diagram (SFD) contains all functional understanding are shown. All readout primary and secondary circuits necessary for an devices, test points, etc., in each equipment that are understanding of the function of a particular mode, significant to system troubleshooting are included on loop, or phase of system operation. Each function is the SFD. A sample weapons system fictional dia- shown from source to termination. Data flow is nor- gram is shown in figure 1-3. Figure 1-3.—Sample weapons system functional diagram. Fault Analysis Matrix Associated switchboards are setup correctly, all power lamps are lit, and no fuses are blown. The fault analysis matrixes (FAMs) and their associated troubleshooting procedures are related to each other and to the SMTs. Together, they provide maintenance personnel with an effective troubleshoot- ing package. To keep this material as specific as possible, the following assumptions are made: All equipment has been properly energized and indicator lamps have been tested. Troubleshooting faults do not begin until the test is completed, if possible. This procedure allows the technician to troubleshoot several related faults simultaneously, reducing troubleshooting time. Troubleshooting faults should occur in the same sequence in which the faults are discovered; for example, a fault discovered in step 9 of an SMT should be corrected before a fault discovered in step 14. Adherence to this sequence for correcting faults is 1 - 1 4