Technicians Handbook - Historic Naval Ships Association

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Figure 1-46.—Combination displays.Six-Step Troubleshooting ProcedureYou may have the job of maintaining or helping to maintain some electrical or electronic unit,subsystem, or system. Some of these jobs may be complex, but even a complex job can be broken downinto simple steps. Basically, any repair of electric or electronic equipment should be done in the followingorder:1. Symptom recognition. This is the action of recognizing some disorder or malfunction inelectronic equipment.2. Symptom elaboration. Obtaining a more detailed description of the trouble symptom is thepurpose of this step.3. Listing probable faulty functions. This step is applicable to equipment that contains more thanone functional area or unit. From the information you have gathered, where could the troublelogically be located?4. Localizing the faulty function. In this step you determine which of the functional units of themultiunit equipment is actually at fault.1-134
5. Localizing trouble to the circuit. You will do extensive testing in this step to isolate the trouble toa specific circuit.6. Failure analysis. This step is multipart. Here you determine which part is faulty, repair/replacethe part, determine what caused the failure, return the equipment to its proper operating status,and record the necessary information in a recordkeeping book for other maintenance personnelin the future. While not a part of this step, the technician should reorder any parts used in repairof the faulty equipment.Sometimes you may run into difficulty in finding (or troubleshooting) the problem. Some hints thatmay help in your efforts are:• Observe the equipment's operation for any and all faults• Check for any defective components with your eyes and nose• Analyze the cause of the failure for a possible underlying problemClasses of Overhaul WorkThere are five classes of equipment overhaul (A, B, C, D, and E). The class defines the type andscope of work to be done on each equipment by the overhauling activity. (Do not confuse equipmentoverhaul with the term regular overhaul.)CLASS A OVERHAUL.—A class A overhaul includes overhaul, repair, and/or modification; forexample a modification could be an Ordnance Alteration (ORDALT), Special Program Alteration(SPALT), Ship Alteration (SHIPALT), or a field change that will sustain or improve the performance of asystem or component to meet its most-recent design and technical specifications. The end product shouldbe like new in appearance and operation.CLASS B OVERHAUL.—A class B overhaul includes overhaul and repair that will restore theperformance of a system or component to its original design and technical specifications. Modificationsor alterations are not done unless specified by the customer.CLASS C OVERHAUL.—A class C overhaul includes only repair work on a system or componentspecified by a work request or work required to correct malfunctions specified by the customer.CLASS D OVERHAUL.—A class D overhaul includes work related to the open, inspect and reporttype of work request. It is intended to be diagnostic in nature and may require various tests. It is normallyassociated with preoverhaul test and inspection (POT& I).CLASS E OVERHAUL.—A class E overhaul includes work required to incorporate all alterationsand/or modifications specified for a system or component.Alterations and Modifications to EquipmentAlterations and modifications to shipboard systems and equipment may take several forms. Some ofthese are Ship Alterations (SHIPALTS), Ordnance Alterations (ORDALTS), Special Program Alterations(SPALTS), and Air Alterations (AIRALTS). These alterations (with the exception of electronicequipment field changes) are categorized as follows:1-135
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SPECIAL PUBLICATIONSeptember 1998Na
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PREFACESpecial Publications (SPs) a
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TABLE OF CONTENTSCHAPTERPAGE1. The
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Module 11, Microwave Principles, ex
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Student CommentsCourse Title:NEETS
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• Be cautious when working in voi
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Electric ShockElectric shock may ca
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In this situation, the immediate ad
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Lean or rock forward with elbows lo
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possible) over the wound and firmly
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(1) NEAREST THE WOUND and (2) BETWE
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Shock• Be sure you draw the tourn
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Liquids should be administered spar
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drinks or stimulants. Get the victi
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Figure 1-11.—RC time constants.Fi
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Ac current formulas are:Ohm's law f
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Parallel inductors without coupling
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Another way to calculate reactive p
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ResistanceRESISTANCE is the opposit
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Since:Transformer power:1-30
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WARNINGRf voltages may be induced i
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Alpha is always less than 1 for a c
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WavelengthCAUTIONBecause vacuum tub
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Minimum radar range = (pulse width
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Log or dBGain or mw11 12.510 109 88
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Table 1-1.—CB Style Capacitor Par
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Table 1-3.—CYR10 Style Capacitor
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Figure 1-16.—Ceramic capacitor co
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Table 1-4.—Principal Applications
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Figure 1-18.—Resistor color code.
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MilitaryspecificationMIL-R-39005MIL
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Figure 1-19.—Color code for trans
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Figure 1-21.—Transistor lead iden
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numbers and part numbers can be fou
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SizeTable 1-10.—Current-Carrying
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Jan TypeOverallDiameter (ins)Table
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Table 1-13.—MS Connector Identifi
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Figure 1-23.—Insert arrangements
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Figure 1-25.—Typical BNC connecto
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Figure 1-28.—Attaching HN connect
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Table 1-16.—N Series Connectors w
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Insulation, Heat Shrinkable Sleevin
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Table 1-19.—Shrinkable Tubing Par
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Table 1-21.—New Style Military Fu
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Conversion and Equivalent TablesTab
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Table 1-24.—Conversion Chart—Co
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Page 96 and 97: Figure 1-33.—Electrical symbols.
Page 98 and 99: Figure 1-34.—Electronic/logic sym
Page 104 and 105: Figure 1-35.—Fiber optic symbols.
Page 106 and 107: Table 1-26.—Frequency Spectrum Us
Page 108 and 109: Joint Electronic Type Designation S
Page 110 and 111: Table 1-29.—Microcircuit Part Num
Page 112 and 113: Table 1-29.—Microcircuit Part Num
Page 114 and 115: CIRCUIT53MC54MC55MC56MC57MC58MC59MC
Page 116 and 117: CIRCUITQAQDQXRARDRW4SNSPTD1TD2TD5TD
Page 118 and 119: CIRCUIT4JZ5JZ6JZ7JZ8JZ9JZ10JZ11JZTa
Page 120 and 121: CIRCUITX29JX34JX40JX41JX42JX43JX44J
Page 122 and 123: Table 1-34.—Common LogarithmsN 0
Page 124 and 125: Table 1-35.─Trigonometric Functio
Page 130 and 131: Table 1-36.—Julian Date CalendarD
Page 132 and 133: Table 1-38.—Effects of Heat and H
Page 134 and 135: Table 1-40.—Old and New Specifica
Page 136 and 137: Remember to use the proper safety p
Page 138 and 139: Figure 1-38.—Computation of phase
Page 140 and 141: Figure 1-40.—Lissajous patterns f
Page 142 and 143: Figure 1-42.—Octopus schematic di
Page 146 and 147: • A military alteration that chan
Page 148 and 149: numbers. They can be easily convert
Page 150 and 151: support equipment. All aircraft equ
Page 152 and 153: Publications and DocumentsVarious p
Page 154 and 155: REFERENCESAfloat Shopping Guide, NA
Page 156: NEETS, Module 9, Introduction to Wa
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Technicians Handbook - Historic Naval Ships Association

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