Locating faults in a cable system can be done either with the circuit deenergized, or in some cases, with the circuit under power. The prospective shortcircuit current of a predictable fault can be calculated for most situations. The device that you will use most frequently in your maintenance tasks is the meter. Logical fault finding tutorial and circuits logical faults problem you should keep your one hand in your pocket when working on high voltage equipment.
Electronic kit basic fault finding guide if you have built a kit and found it does not work first time please dont despair. Identify three possible faults that could cause this problem to occur, and identify what components of the stereo system are known to be okay be sure to count each cable as a separate component of the system. Simple circuit examples are used to illustrate principles and concepts fundamental to the process of fault finding. Jan 01, 2015 doublewide6 recommends safe practices when working on equipment, power tools, chemicals, electronics, electrical systems, vehicles, and or with tools seen or implied in this video. Diodes a two terminal pn junction device that allows the flow of current only in one direction. Accordingly the first step in any fault finding is to look for the major problems. Troubleshooting electrical controls how to troubleshoot a. The electronic system may play a part in keeping your work colleagues safe. Purchase practical electronic fault finding and troubleshooting 1st edition. Getting a dead board working is a very rewarding experience.
Purchase practical electronic faultfinding and troubleshooting 1st edition. Basic electrical and electronic components active devices devices or components which requires external source to their operation. Fault findings and repairing of different kind of recorders. Practical electronic faultfinding and troubleshooting 1st. This is in contrast to mechanical repairs, which are often easy to diagnose and hard to repair. What you need to do is physically trace the wire from one connection to the next. The first steps in checking the circuit are to ensure that it has power being supplied to it.
Pdf fault diagnosis in analog electronic circuits the svm approach. Basic fault finding guide here are some simple fault finding techniques that you can try. Intermittent fault irregular, harder to find tools for the job. How to find fault in electronic circuits component. In this book robin pain explains the basic techniques needed to be fault finder. While it is faulty, their safety must not be compromised. The process of troubleshooting requires a systematic fault finding approach. The domain of electronics under consideration will be restricted to dc circuits. Generally, an electrical circuit is made of electrical components like lights, pumps, fans and motors, switches, fuses, relays, circuit breakers and fusible links. This is easily done using a multimeter set to a voltage range.
Locating and diagnosing faults in electrical systems and. The unit will enable learners to read circuit, schematic and wiring diagrams and carry out faultfinding procedures by obtaining the necessary information, documentation, tools and equipment. Specific troubleshooting techniques troubleshooting. Troubleshooting electronic equipment electronic resource. Practical electronic faultfinding and troubleshooting 1st edition. An electrical fault is the deviation of voltages and currents from nominal values or states. They will also develop the ability to select faultfinding instruments and apply the techniques used for the diagnosis of faults. These are circuits consisting of resistors, diodes, zener diodes, capacitors, transistors, switches, potentiometers and dc voltage sources. Electronics troubleshooting finding whats wrong youtube. Before getting into details of printed circuit board, there are some basics you need to know about circuits.
Pdf fault detection techniques for induction motors. There are 10 of these boards with different faults on and candidates can practice their fault finding skills on them. A transistor radio has several stages and the signal from the aerial passes through these and is emitted from the loudspeaker as an audio signal. Under normal operating conditions, power system equipment or lines carry normal voltages and currents which results in safer operation of the system. Fault location techniques can be broadly divided into terminal methods, which use voltages and currents measured at the ends of the cable, and tracer methods, which require inspection along the length of the cable. To be a real fault finder, you must be able to get a feel for what is going on in the circuit you are examining. How did each control affect an associated meter or other indicator. Fault detection, isolation, and recovery fdir is a subfield of control engineering which concerns itself with monitoring a system, identifying when a fault has occurred, and pinpointing the type of fault and its location. These principles apply in all disciplines regardless of whether they are civil, electrical, mechanical etc. The constructor of electronic circuits and the service engineer should both. Using correct and appropriate techniques, procedures, tools and equipment, circuits is repaired, replaced or adjusted to specifications or manufacturers requirements. There are 10 of these boards with different faults on and candidates can practice their fault finding.
Troubleshooting of an electronic circuit is a process of having a special outlook on components that comes out with remedies to repair it. Both require a solid understanding of the underlying electronics theory. To expertly troubleshoot electrical equipment, problems must be solved by replacing only defective equipment or components in the least amount of time. Intermittent problems can be more difficult to find. We have been learning about some interesting facts and circuits related to digital electronics such as ghost detection circuit, basic tubelight circuit, dc to dc charger and so forth. In threephase systems, a fault may involve one or more phases and ground, or may occur only between phases. Chances are, you wont be an expert in repairing these devices, but you can take some practical steps to solve problems and help get your systems operational again in a timely. Not only do you get the satisfaction of it working but you will actually learn a good deal more about electronics on the way. Analogue signature analysis to test the unpowered printed circuit boards pcbs. Radio works as a receiver, to receive radio signal, process and produced audio. If there is a problem in electric circuit then possible causes may be. Basic electronic troubleshooting techniques as an industrial electrician, youll encounter many complex electrical circuits and drives that will break down as they age. Cover photo by thomas scarborough, reproduced by permission of everyday practical electronics. It is a book of practical tips, hints, and rules of thumb, all of which will equip the reader to tackle any job, whether it is fixing a tv, improving the sound from a hifi, or locating the fault in a.
Local methods for localizing faults in electronic circuits. This is where i will make a drawing of the circuit as i trace it along for future reference and to make it easier for the next sparky that has to work on the machinej. Troubleshooting is the process of tracing and rectifying faults in electric electronics circuit. In first question, we should know the devices and their function working style.
Electrician training a systematic approach to trouble shooting and electrical fault finding. Candidates on the electronic fault finding training course explore the workings of complex circuits incorporating voltage comparators, multiplexed display driver ics, logic gates etc. Electronic fault dagnosis practical electronics electrical. Section 4 sixstep troubleshooting plan autoshop 101. Resistors a twoterminal passive component that opposes the flow of current reduces the electric current and at the same time lowers the voltage levels in a circuit.
Hi, i have a fault finding test soon and need some advice on the sequence of tests to carry out. Often circuits like transistor radios fail after they have been used for many years, and it is useful to be able to mend them also when constructing equipment, circuits do not always work first time and it is necessary to fault find. Pdf fault diagnosis in analog electronic circuits the. Electronic control modules ecms are difficult to kill. It deals with minute analysis to pinpoint the faulty component. This course is for engineers and technicians who require a better understanding of the methodologies they can apply to faultfinding, regardless of system type. Apdf split demo chapter 8 testing and troubleshooting. All ac effects will be ignored although an analogous type of analysis would work for ac circuits. Massachusetts institute of technology artificial intelligence. Troubleshooting electrical controls how to troubleshoot. An opencircuit fault occurs if a circuit is interrupted by some failure. Diagnosing of defective printed circuit boards pcb. A typical electrical circuit consists of an electrical component pump, light, motors, fan, etc.
But not like functionality test it performs tests only on input and output stages. Electrical fault finding the peak current is so great that. A direct pattern recognition of sensor readings that indicate a fault and an analysis of the discrepancy between the sensor. An essential companion to john c morriss analogue electronics, this clear and accessible text is designed for electronics students, teachers and enthusiasts who already have a basic understanding of electronics, and who wish to develop their knowledge of digital techniques and applications. A multimeter is an ideal piece of test equipment to help with fault finding an electronics transistor circuit. Mem18048b fault find and repairrectify basic electrical circuits. Practical electronic faultfinding and troubleshooting. It can also be accomplished by measuring the voltage across a resistor of known value. Also an intuitive approach can be used but must be accompanied by a deductive technique. The diagnosis procedure belongs to simulationbefore test techniques, where simulations of the circuit under test cut are performed at the before test stage. If the problem is continuous or not intermittent, it should be fairly obvious when you operate the suspect system. As an example, consider the techniques for measuring current in a circuit. In this video i describe about fault finding in any electronic circuits with multimeter. Time spent understanding the circuit and the nature of the fault will be well spent.
This is a powerful troubleshooting method, because it gives you both a positive and a negative indication of the swapped components fault. Designing an electronic system is one thing checking that it works, time after time, in a production setting is quite another. The unexpected behavior exhibited by the circuit is due to improper locating or soldering of components, component damage due to aging, faults, overheat, and so on. Ebook practical electronic fault finding and troubleshooting. In a ground fault or earth fault, current flows into the earth. Then, using ohms law, you can calculate the current. There is a generally recognised method of approaching faultfinding, which is referred to as the 5point faultfinding approach. General troubleshooting guide for electric circuit. Sixstep troubleshooting plan body electrical diagnosis course l652 7 when verifying the problem, you must also determine if the problem is continuous or intermittent.
The interconnected nodes dont represent any particular components. Diagnosis of faults requires a logical and disciplined approach. P3 prepare a written fault location strategy for a given analogue electronic system and identify the fault finding and signal tracing techniques to be applied ie1, ie4 m3 justify the choice of test instruments selected to identify fault conditions within an electronic. For example, function of signal generator is to produce sinusoidal signal or squarewave. What fault is probably causing the specific symptoms. Unidentified high pin count is tested by alternating voltage. Short circuit a connection that may be closed is called. Locating and diagnosing faults in electrical systems and equipment semeee3 35 locating and diagnosing faults in electrical systems and equipment 1 overview this standard identifies the competencies you need to investigate, locate and diagnose the cause of faults on electrical systems and equipment, in accordance with approved procedures. Jan 20, 2012 this method of fault finding works well even if you do not have a circuit diagram. In fault finding, time is of the essence, for a number of reasons. Frequently, past experience or detailed knowledge will help. This method of fault finding works well even if you do not have a circuit diagram. Sinclair electronics fault diagnosis fountain press argus books ltd. We suggest that you thoroughly recheck the circuit again using the sequence detailed below.
You will find a more complete coverage of meters in chapter 15 of basic. Investigate now attempt to find the fault from your analysis 4. Symptom elaboration requires an evaluation of all observed displays. Electrical fault finding techniques gordons powers. Fortunately most faults with electronics equipment such as transistor radios are relatively major and therefore easy to find. Both are equally challenging and equally rewarding. Faults are recorded to standard operating procedures. Finding electrical faults, you will need basic knowledge of electrical faults identification in addition to electrical diagrams. Logical fault finding tutorial and circuits logical. Indications must be evaluated in relation to each other as well as the overall operation. General principles of fault finding in this section we look at the general principles of fault finding through the application of diagnostic reporting. Typeset by cepha ltd printed and bound in great britain 0708091011 10987654321. Pdf testing methods for fault detection in electronic circuits.
Find fault in stage ssiixxstep method for troubleshootingstep method for troubleshooting stage faulted input output power supplies check for correct power supply values check actual circuit against schematic replace ic or transistor check component values check all connections resolder, tighten. Fault location methods can be classified into different categories. The unit will enable learners to read circuit, schematic and wiring diagrams and carry out fault finding procedures by obtaining the necessary information, documentation, tools and equipment. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Sixstep approach to fault finding posted on 19th april 2016 in maintenance, training during the course of assessing more than candidates over a 15 year period, mcp has found fault finding to be the second biggest weakness in maintenance trade tests. In this section we look at the general principles of fault finding through the application of diagnostic reporting. Fault diagnosis in analog electronic circuits the svm approach article pdf available in metrology and measurement systems 164 august. Successful fault finding calls for an additional skill set, including the ability to. Practical electronic fault finding and troubleshooting top results of your surfing practical electronic fault finding and troubleshooting start download portable document format pdf and ebooks electronic books free online rating news 20162017 is books that can provide inspiration, insight, knowledge to the reader. Electrical fault finding the peak current is so great that a.
Practical electronic fault finding and troubleshooting. In this field, nothing is more valuable than experience. Sometimes a circuit might develop some sort of a defect or fault and it is necessary to carry out electrical troubleshooting in such a case. Finding electronic faults in radios, in particular valve radios, is not rocket science. Episode 54 basic component faultfinding with a multimeter. This simple troubleshooting technique is applicable to a wide variety of electrical, electronic, and other types of systems. This joke among electronic system engineers is worth keeping in mind. This type of research aims to identify diagnostic strategies troubleshooters use. You can buy how to test almost anything electronic from amazon. Help, test sequence of fault finding of electrical circuits.
The first involves discovering more values such as currents and voltages occurring at various points in the circuit, and the second involves finding coincidences. By warren rhude, president of simutech multimedia inc. One of the most common troubleshooting techniques taught to technicians is the socalled divide and conquer method, whereby the system or signal path is divided into halves with each measurement, until the location of the fault is pinpointed. Electronic equipment repair topic 3 diagnosis techniques. Principles of systematic fault diagnosis diagnosis of faults requires a logical and disciplined approach.
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