If you need to repair damaged circuit boards, the allinone professional kit is just what you need. Jan 01, 2015 electronics troubleshooting finding whats wrong. Before getting into details of printed circuit board, there are some basics you need to know about circuits. You unsolder the transistors from the circuit board and unscrew them from the heat sink, but you cannot read the part numbers on their cases due to the thermal damage. I always use a film canister or pill bottle for storing the screws, washers, and springs removed during disassembly. Diagnosing of defective printed circuit boards pcb. Troubleshooting of an electronic circuit is a process of having a special outlook on components that comes out with remedies to repair it. Even if you dont have an electrical schematic of the circuit board, which would identify components and give you the voltage and resistor values that should be present, many circuit boards have test points that are clearly labeled. Huntron tracker poweroff circuit board test uses analog signature analysis to detect and isolate component faults on boards beyond poweron functional testing. On older printed circuit boards, the techniques used for troubleshooting were performed in. How to diagnose a circuit board with a bad transistor. Even if you dont have an electrical schematic of the circuit board, which would identify components and give you the voltage and resistor values that should be present, many. Printed circuit boards pcbs are by far the most common method of assembling modern electronic circuits.
We have multiple custom design boards that we used to help teach our students to understand electronics and how to troubleshoot electronics. Preventive maintenance will help avoid serious problems by taking care of little problems. Expected voltage readings when testing a transistor circuit with a multimeter. Control repair printed circuit boards adjustable speed. Circuit boards are more complicated to repair today than even a few years ago. I take you through the basic process of troubleshooting electronic devices that do not work. Nov 29, 2010 good troubleshooting skills are vital to the electronics hobbyist. Those who wish to be able to multiskill into electronics. Learn how to troubleshooting repairing the lcdled tv and lcdled monitor screen some repairer will call it as. The circuit shows several of the points where the voltage can be measured in a circuit. Tv circuit board diagram repair pdf circuit diagram images. 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. Confidently carry out simple repair procedures for the correction of faults on printed circuit boards. Sharp tv circuit board diagrams, schematics, pdf service.
Describe how to begin properly troubleshooting electronic circuits. These electronic devices range from consumer electronics such as. An electrician is troubleshooting a faulty light circuit, where the power source and light bulb are far removed from one another. Practical troubleshooting of electronic circuits for engineers and. This includes basic refrigeration, electricity, electrical components and how electromechanical controls work. Circuit board problems resource for troubleshooting.
Download our pdf guide solving conformal coating problems in the application process now. Because most failures occur within the power sections instead of the circuit boards, they arent very difficult to troubleshoot. Many identical address and data bus lines share the same electrical characteristics and make the fault finding process a challenge. Electrical troubleshooting, plc troubleshooting training. A new test strategy for complex printed circuit board assemblies stig oresjo agilent technologies, inc. This simple troubleshooting technique is applicable to a wide variety of electrical, electronic, and other types of systems. The repair specialists at circuit technology center, inc. After all they are a relatively new coating type in the world of conformal coatings and printed circuit boards. Yet, were driven by simple economics and must repair damaged pc boards whenever possible. One of the more difficult types of electronic repair tasks is troubleshooting bus structures on complex digital microprocessor based circuit boards. The lab manual can be accessed via the software and you can also optionally print it out for a hard copy. 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. Basic troubleshooting strategies all about circuits.
It also includes instructions on how to use the tstrainer. Properly inspect the condition of an electronic circuit and its components. Firstaid kits for circuit boards, timetested and guaranteed. This is an integrated circuit that has regulation and protection circuits built into one package. Good troubleshooting skills are vital to the electronics hobbyist.
Electronics troubleshooting finding whats wrong youtube. Comprised of a sandwich of one or more insulating layers and one or more copper layers which contain the signal traces and the powers and grounds, the design of the layout of printed circuit boards can be as demanding as the design of the. The included 32 page electrical troubleshooting pdf lab manual also provides more introduction to troubleshooting control circuits. When troubleshooting, make sure mains power is disconnected before proceeding to check the printed circuit board to prevent electric shock. 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. Power supply troubleshooting and repair tips duration. You may hear a tickticktick sound as the igniter is cycled repeatedly. There can be one or more circuit boards inside of electronic equipment.
What does this simple fact indicate or possibly indicate about the nature of. What would you recommend as the next voltmeter measurement to take in troubleshooting the. The components can be physically interconnected to each other using solder, wirewrap and printed circuit board methods. Explain the function of an electronic power supply. On older printed circuit boards, the techniques used for troubleshooting were performed in a variety of ways, including the following. How to use a multimeter on a circuit board our pastimes. Basic troubleshooting strategies worksheet basic electricity. Rv furnace troubleshooting ignition control circuit board a printed circuit board that initiates gas valve opening and triggers the igniter. Compact package for testing troubleshooting in tight spaces.
For the process of troubleshooting, preparing the circuit diagram is the initial and basic process performed by the maintenance technician. On circuit boards of the 1980s and 90s, it was possible to perform repairs with the use of automatic testing tools, which simply do not work on todays pcbs. Pilot light a tiny propane flame that remains continually on burning and lights a larger charge of propane when the main gas valve opens. Keysight technologies troubleshooting a printed circuit board. For proper air conditioner troubleshooting, you need to understand some basics of air conditioners. Because electronic circuits can cease to function if any one of their various components fail, circuit board troubleshooting can be a delicate and timeconsuming process. Troubleshooting and repair of consumer electronic equipment. Insulating sticks for prodding to locate intermittents. Although this book is entitled everything you ever wanted to know about laminates, but were afraid to ask, the real subject matter is printed circuit boards, the materials that are used to manufacture them, and how you as a designer or manufacturer of mlbs can benefit by a better understanding of what we, as laminators, do and supply. These boards are fully functional boards allowing students to know howwhat a circuit is doing and we can put faults into these circuits to allow our students to troubleshoot these circuits giving them real world handson training. Many boards have significantly more components and solder joints today than just a few years ago.
The circuit below is a typical basic transistor circuit. Feb 18, 2009 hi guys, i have a associate degree in electronics but need help on learning how to troubleshoot circuit boards using schematics. Practical troubleshooting of electronic circuits for. What would be a fast and effective way of testing this switchs continuity ideally, without removing the switch from the circuit board.
The circuit shows several of the points where the voltage can be. This threeday seminar focuses on handson troubleshooting down to the component level without a schematic. Compact package for testingtroubleshooting in tight spaces. In addition, basic air conditioner components and air conditioner sequence of operation.
Many circuits are similar to it, and it provides good starting point to explain some of the points to note. The service manual which is provided along with the equipment. Multimeters can be valuable troubleshooting tools when working with circuit boards. It can be very intimidating when a component on a board gets hot, exhibits unexpected behavior, does nothing at all, or even explodes. Nominal input voltage of rgu v ac maximum dc input of drive v dc 380 460 575 632 746 933. Lester lestronic ii troubleshooting manual pdf download. Study unit understanding and using electronic diagrams. Basic circuit troubleshooting basic electricity pdf version. The necessary components were chosen and the circuit was built on a prototyping board to verify that it met the design. Do not touch the components or conductors on a printed circuit board with your hands or with conductive devices. Transformer coil voltage test withwithout capacitor wiring diagram charger does not turn on proper care of motive power batteries.
Boardlevel troubleshooting tipl 1901 ti precision labs ti training. Insulating sheets for separating circuit boards when removed from the chassis. What would you recommend as the next voltmeter measurement to take in troubleshooting the circuit, following the same divide in half. 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. Basic circuit troubleshooting worksheet basic electricity. The scope of this section is really to focus on troubleshooting the problems associated with conformal coating processing and production. To reduce the risk of esd damage to circuit boards, wear a grounding wrist strap when handling circuit boards.
The typical plant maintenance technician will rarely see enough failures to build up any proficiency in repairing circuit boards. Is this the only fault, being that it is the only component visibly damaged. Before troubleshooting, you need to identify the basic problem with the system. The general troubleshooting process is explained followed by a brief study of various hand tools and electronic test and measuring instruments. Split airconditioner control troubleshooting guide here is a list of split airconditioner control troubleshooting guide that you can use if you need to troubleshoot your split air conditioner unit. Any study guide out there or good books on troubleshooting circuit boards with or without schematics. Troubleshooting modern, complex, multilayer pcbs is often challenging, with. The troubleshooting portion of precision labs presents a number of best practices to assist the customer with. These circuits are easy to use, and are found in many applications.
Introduction the trend in printed circuit board assembly pcba technology is towards higher complexity. More often than not, a circuit is not going to work perfectly on the first try, especially as a beginner. Our voltage monitoring diagnostic boards offer a convenient and fast method for calibrating, testing and troubleshooting mks mass flow controllers, baratron capacitance manometers and other electronic instruments. Air conditioner troubleshooting good ac repair tips 1 how to. In the case of the example optosensor circuit see fig. A virtual troubleshooting exercise such as this one is a good way to start students thinking in the right ways to becoming effective troubleshooters. Hi guys, i have a associate degree in electronics but need help on learning how to troubleshoot circuit boards using schematics. Electronic repair training circuit board repair and rework. Huntron trackers circuit board test and troubleshooting. If the swapped component is indeed faulty, but in such a way that it. By comparing tracker signatures from a working circuit board to the signatures of a nonworking board, you can troubleshoot down to the component level. Page 1 troubleshooting guide page 2 charger does not turn on page 3 page 4. In some furnaces the igniter sequence may last several seconds and make multiple attempts to light the flame. However, you can use the repeating nature of this digital.
Question 7 an electrician is troubleshooting a faulty light circuit, where the power source and light bulb are far removed from one another. A basic checklist for any central air conditioner troubleshooting will include checking for blown fuses or tripped circuit breakers. Heating and cooling systems need preventive maintenance. Fortunately, electrical circuit troubleshooting is an activity that works well for small groups of students to engage in as well as individual students. Industry standard connectors for easy insitu monitoring of inputoutput. Tv circuit board diagram repair pdf data wiring diagram flat panel tv diagram of internal parts and circuit boards note. Grounding is a problem area in itself for all analog and mixed signal designs, and it can be said that simply implementing a pcb based circuit doesnt change the. If you suspect that your circuit board has a bad transistor, you can test for a failure by using a multimeter. You will learn to implement procedures for the testing of electronic components as well as carry out simple repair procedures for the correction of faults on printed circuit boards with.
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