Nautel NV5LT Troubleshooting Manual

Contents

Nautel NV5LT Troubleshooting Manual Manual pdf 259 page image

NV5LT/NV3.5LT TROUBLESHOOTING MANUAL READING ELECTRICAL SCHEMATICSVERSION 3.3 2016-03-10 PAGE 4.4.3Structure of SchematicsThe electrical schematics are structured in a hierarchical format that is based on function and signalflow. Wherever practical, the signal flow is from left to right. Normally, inputs originate on the left-handside and outputs extend to the right-hand side. Exceptions are shown by an arrow indicating thedirection of signal flow.NOTE: The physical location of a part or assembly was not necessarily a factor during creation of theschematic. The full reference designation assigned to a part or assembly, in conjunction with the familytree (see Section 4.2, “Parts Lists” on page 4.2.1) and the assembly detail drawings (see Section 4.5,“Mechanical Drawings” on page 4.5.1), will identify its location.Figures SD-1 through SD-9 identify each major stage and its detailed interconnection. Each stagecontains cross-references that identify which blocks are the signal sources for inputs, or the destinationsfor outputs.When a sub-function is treated as a block in figures SD-1 through SD-4, its detailed circuit informationis included in its own schematic drawing(s), which is also included in this section.Locating Schematic Diagram(s) for a Functional BlockThe text inside a functional block provides the key to locating its schematic diagram(s).1. When a functional block is assigned a reference designation (e.g., A4A4), refer to the family treesin Section 4.2, “Parts Lists” on page 4.2.1. Follow the family tree branches to the block thatcontains the desired reference designation, and associated Nautel nomenclature (e.g., NAPA31BPower Amplifier PWB). Note the reference designations and Nautel nomenclatures of all higherassemblies in the path.Example: A4 NAE106C Exciter/Controller Assembly > A4A4 NAPA31C Power Amplifier PWB.2. Refer to Table 4.4.1 on page 4.4.5 and use the reference designation and Nautel nomenclature toidentify the appropriate schematic diagram(s).Example: NAPA31C Power Amplifier PWB is shown on schematic SD-22.3. If necessary, refer to the referenced figure in the schematics at the end of this section and locatethe next, lower-level assembly. Then, repeat this procedure until the desired schematic diagram isfound.