The contactor k remains energized as long as the control contact is in a close condition. Circuit disturbance any operation or procedures that disturb a circuit from its normal condition. A change in second limiter generally means that stage was functioning. As an industrial electrician, youll encounter many complex electrical circuits and drives that will break down as they age. Troubleshooting control circuits simutech multimedia. Someone just gave me a collection of used amateur equipment, but some of it doesnt seem to be working right.
Ac voltage source tb1 tb2 tb5 tb4 tb6 tb3 light as you can see in the diagram, there are several terminal blocks tb through which electrical power is routed to the light bulb. Troubleshooting electrical control circuits 3 day learn to wire, operate, and troubleshoot a circuit before noon, day 1. Troubleshooting and using circuit laws gaining circuit familiarity troubleshooting basics common troubleshooting techniques the program the practical troubleshooting of electronic circuits workshop will teach you how to recognise and efficiently troubleshoot common electronic component and circuit problems. Suppose a technician were troubleshooting the following circuit, whose light bulb refused to light up. Basic electricity current, voltage, and resistance ohms law and calculations seriesparallel circuits kirchhoffs laws and corollaries. The control contact may be a level switch contact or a temperature switch contact. Your professionals will diagnose and repair a variety of faults in a simulated control circuit consisting of relays, pushbuttons, a control transformer, a solenoid lock, a proximity switch, and circuit protection. In cases, when deep troubleshooting is required for pcb repair then we need complex technology to properly troubleshoot a pcb and trace a problem back to its source, like you may need to use something like an lcr meter, an oscilloscope, or a power supply and logic analyzer. Avoid contact with energised electrical circuit assume that they all are alive. The emphasis is on practical issues that go beyond typical electrical principles, providing a toolkit of skills in solving electrical problems, ranging from. About 70% of the time is spent working, handson, at a troubleshooting station with motor control circuits operating at a safe, low level of 24 volts.
How to troubleshoot and repair electronic circuits. This book provides an excellent introduction to electronic circuit design. Troubleshooting electrical control circuits industrial wiki. Electrical troubleshooting 3 measuring voltage drop observe the circuit above. Troubleshooting and repair of consumer electronic equipment. I am laurence aka larry dimock, the circuit detective, a master electrician in washington state who concentrated on troubleshooting home electrical problems. Many problems have multiple causes, and the problem wont be fixed. I used to offer email and phone advice from here, but now that ive retired, youll have to rely on this diditmyself website to fix your problem, as over million have since 2004. Look for improper voltages, improper waveforms, obvious component overheating.
When a properly working circuit breaker trips frequently and there are no malfunctioning loads on the circuit, it means the circuit is overloaded. Motor circuit breakers and switchboards purpose and duty clearance times types troubleshooting variable speed drives fundamentals of variable speed drives problems associated with variable speed drives terminology used manufacturers literature what they dont tell you minimisation of equipment failure. Getting into troubleshooting this document attempts to provide an entry to the world of consumer electronics troubleshooting and repair. Part i is a barebones introduction to basic electronic theory while part ii is designed to be a practical manual for. Troubleshooting electrical control circuits is defined as the logical and orderly process to determine the fault or faults in an electrical control circuit. This simple troubleshooting technique is applicable to a wide variety of electrical, electronic, and other types of systems. Lab notes prepared by the arrl laboratory staff email. Good troubleshooters are rare, and in my opinion that has. Troubleshooting home electrical problems the circuit detective. Simutech multimedia troubleshooting electrical circuits. These circuits are easy to use, and are found in many applications.
Nov 29, 2010 good troubleshooting skills are vital to the electronics hobbyist. Basic circuit troubleshooting this worksheet and all related. As mentioned, the program will explain how to diagnose and repair different types of electronic components and circuits. More often than not, a circuit is not going to work perfectly on the first try, especially as a beginner.
To troubleshoot, a sequence of measurements must be made to localize this point of variance, or fault. Local methods for localizing faults in electronic circuits. This will help in calculating circuit values using ohms law. In this study, put a sample of zinc oxide in electric circuit, circuit consists of a power supply, ammeter and voltmeter. Practical troubleshooting of electrical equipment and. The total resistance of a series circuit is equal to the sum of individual. The constructor of electronic circuits and the service engineer should both. But it is difficult to put a test probe on the circuit board for making any type of measurement or for troubleshooting.
Practical troubleshooting of electrical equipment and control. Practical troubleshooting of electronic circuits for. These devices include stereos, cameras, vcrs, and much more. It can be very intimidating when a component on a board gets hot, exhibits unexpected behavior, does nothing at all, or even explodes. As a technician, you are sent to troubleshoot a complex piece of electronic. The next step involved building a signature analysis test to perform some poweroff diagnostics. This barcode number lets you verify that youre getting exactly the right version or edition of a. Troubleshooting series circuits flashcards quizlet.
Troubleshooting of an electronic circuit is a process of having a special outlook on components that comes out with remedies to repair it. The 2sa1837 transistor is pnp, data sheet is attatched below. What would you recommend as the next voltmeter measurement to take in troubleshooting the circuit, following the same divide in half. For example, suppose that a circuit develops a short, which blows the protective fuse for that circuit. Study unit understanding and using electronic diagrams. As with the voltmeter, the observed values are compared with the normal. The most versatile tool used for troubleshooting pcbs is a multimeter. The workshop will give you a solid understanding in common electronic terminology and symbols, as well as the construction and operation of common electronic components. More importantly, you need to understand basic safety rules.
Even of the bridge is a moulded one, you may take it out of circuit and check and then put back provided you have resources. Refer to the important information in the 1995 arrl handbook safety and troubleshooting chapters. Free electronic circuits books download ebooks online. Understanding and using electronic diagrams 5 in this simple power supply, all the voltage regulation functions are done by u 1, which is a 7812 positive voltage regulator.
You do need to be able to read a schematic diagram and understand basic circuit functions. Basics of multimeters analog and digital multimeters solenoid meters accessories. After the circuit breaker trips, test for power at nearby receptacles. In troubleshooting, new information is provided by coincidences. If the entire supply is smps, the trouble shooting approach is different it would be risky to handle the smps due to shock and many times shock can be fatal please take this as caution. Digital circuit a digital circuit can be one which has nonlinear components in it. In troubleshooting by circuit disturbance, the second limiter voltage is monitored while various circuits are disabled by removing the tube or grounding a grid or similar section. Troubleshooting is a special field of knowledge and has its own special outlook on things. Multimeters during troubleshooting, you, as a technician are often required to measure voltage, current, and resistance. A circuit element which results in this linear response is called a resistor. To eliminate the necessity of obtaining three or more meters, you will use a multimeter. Be sure that parts with positive or negative markings are positioned as shown in the drawings. Current is defined as the flow of electrons and is measured in amperes. Some of the voltages found in electronic equipment are lethal.
An amplifier stage is usually dead or working, a digital circuit works, or is stuck in one state. Suppose that something goes wrong in this voltage divider circuit, and the load voltage suddenly falls to zero. Part i provides an introduction to basic electronic theory and part ii is designed to be a practical manual for designing and building working electronic circuits. We did this with a recent stepper motor driver that had failed and did not see any issues.
An analog circuit has analog signal inputs which are continuous range of voltages. Fifty 50 readings for voltagemv and currentmv are taken. If you need to repair damaged circuit boards, the allinone professional kit is just what you need. With hints for troubleshooting in general electronics, but not in hospital equipment repair. Troubleshooting control circuits tcc is the second simulation in our series. Localizing the trouble to the circuit isolating the circuits within the faulty unit. Most circuit problems are due to incorrect assembly, always double check that your circuit exactly matches the drawing for it. Consumer electronics troubleshooting and repair handbook davidson 1198 pages about common faults and troubleshooting techniques in consumer electronics. Troubleshooting receivers the four methods of troubleshooting are. The practical troubleshooting of electronic circuits workshop will teach you how to recognise and efficiently troubleshoot common electronic component and circuit problems. Measurement of circuit parameters definition of terms. Be sure that all connections are securely fastened. Massachusetts institute of technology artificial intelligence. More extensive troubleshooting is now required within the identified faulty unit.
If a meter of low ohms per volt is used to measure the voltage in a high resistance circuit, the effect of the meter shunting load being measured will result in an inaccurate reading. However, competent skill can only be attained through continued experience in applying these principles each time the technician troubleshoots a malfunctioning equipment. Introduction to circuit troubleshooting et 150 troubleshooting learning objectives in this lesson you will. Recognise and efficiently troubleshoot common electronic component and circuit problems.
Feb 18, 2009 even of the bridge is a moulded one, you may take it out of circuit and check and then put back provided you have resources. One of the first steps in troubleshooting an electronic circuit board is to perform a visual inspection. If the entire supply is smps, the trouble shooting approach is different it would be risky to handle the smps due to shock and many times shock can be fatal. An electrician is troubleshooting a faulty light circuit, where the power source and. If the swapped component is indeed faulty, but in such a way that it. In the most general sense a coincidence occurs when a value at one particular point in the circuit can be deduced in a number of different ways. A digital circuit has digital signal inputs which are discrete values. Basic troubleshooting strategies worksheet basic electricity. 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. Circuit troubleshooting is the highest level of thinking required of many electrical and electronics professionals. Troubleshooting electrical circuits simutech multimedia.
Practical troubleshooting of electrical equipment and control circuits will help engineers and technicians to identify, prevent and fix common electrical equipment and control circuits. First make sure the problem is not something simple such as an unplugged device or a tripped circuit breaker. Basic circuit troubleshooting basic electricity pdf version. Practical troubleshooting of electronic circuits for engineers and. Good troubleshooting skills are vital to the electronics hobbyist. Your professionals will learn to diagnose and repair a variety of faults in a simulated electrical circuit consisting of wiring, lights, relays, switches and pushbuttons. First make sure the problem is not something simple such as an unplugged device or a. It describes the method used by competent and experienced technicians to isolate an equipment malfunction in a rapid, systemic manner.
You will notice from the diagram that 1 amp continually flows through the circuit. Electronic troubleshooting skills are needed to diagnose and repair several types of devices. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The multimeter combines a voltmeter, ammeter, and ohmmeter in one unit.
This could be a shorttoground in the wiring, or, the electrical unit served by the circuit could be shorted. This is a basic course, without any prerequisites, that. Electronic troubleshooting, fourth edition 4th edition by daniel tomal author, aram agajanian author 3. Troubleshooting electrical circuits tec is our foundational electrical troubleshooting simulation. Production testing and troubleshooting is different. This book has been prepared for navy personnel whose rating requires a troubleshooting capability in electronic equipment.
Free electronic circuits books download ebooks online textbooks. Horizontal oscillator vertical countdown systemvertical sweep amplifier solidstate rca 99 101 chassishonzontal sweep output circuit solidstate rca ctc 99 101 chassischroma circuitry ic chip rca ctc93 chassishybncl vertical sweep circuitplate coupled vertical sweep circuit tube typeplatecoupled multivibrator twotube. An electrician is troubleshooting a faulty light circuit, where the power source and light bulb are far removed from one another. Specific troubleshooting techniques troubleshooting. A technician following the divideandconquer troubleshooting strategy begins by measuring voltage across the lower resistor finding 0 volts, then measuring voltage across both resistors finding 12 volts. The problem for the troubleshooter is to determine what a. The test leads are connected in parallel across the circuit load. The blown fuse is not evident by inspection, and you dont have a meter to electrically test the fuse, so you decide to swap the suspect fuse with one of the same rating from a working circuit. 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. Circuit board problems resource for troubleshooting. Mar 20, 2016 understanding basic electricity can be invaluable in both safety, as well as when troubleshooting and repairing an electrical circuit. In a series circuit, the amperage at any point in the circuit is the same.
Sharpen and improve these skills with continued handson training. Electrical circuit troubleshooting all about valiants. Basic circuit troubleshooting worksheet basic electricity. It requires you to follow specific and systematic procedures.
We will add more posts soon on many topics such as how to build a solar generator, and this post will help build the basics on which those posts will expand. Praise for electronic troubleshooting the fourth edition of electronic. Using more than one space heater or hair dryer at the same time is a common cause of this problem. With a 12 volt power source connected to the load, the meter should read a voltage drop equal to the source voltage or 12 volts. Cc for complex circuits, reduce the circuit in steps using the rules for both series and parallel connections until you are able to solve problem. Day two motor circuit breakers and switchboards purpose and duty clearance times types troubleshooting variable speed drives fundamentals of variable speed drives. This is an integrated circuit that has regulation and protection circuits built into one package. It also covers test equipment selection, tools and supplies, parts, home made troubleshooting aide incredibly handy widgetstm and safety.
The text can provide the reader with the principles of troubleshooting, and synthetic problems are included that parallel their application on actual equipment. Basic troubleshooting strategies all about circuits. Understanding basic electricity can be invaluable in both safety, as well as when troubleshooting and repairing an electrical circuit. Troubleshooting a broken amplifier electronics forum.
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