Attach your amp probe to the line splitter, plug in and run microwave 10-20 seconds. Not 2:04, nor 2:02 except ye go on to 2:03. Sometimes sharing a picture can help us, help you faster! Don’t touch any wires inside the microwave since they could possibly still have a charge. Method 6 Shorting the Leads of Capacitor (Traditional Method – only for Professionals) The method described here is one of the oldest methods to test a capacitor and check whether it is a good one or a bad one. Sometimes, the metal box with the capacitor has the image of a lightning bolt on it to mark that it’s dangerous. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. The primaries have a 3 ohm resistance but the secondaries have about a 1 ohm resistance. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Now you will need to very carefully remove the leads from the terminals of the magnetron. Microwave Transformers; Skip to page navigation. Microwave OVEN High Voltage Transformer 120V 60Hz BWL-R MD-101AMR . This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This article has been viewed 6,038 times. attach it around the power line. Tape the removed wire lugs to prevent shorts. Microwave Transformers. Obtain a clamp meter. If you get less than one, your winding has shorted. The MOT represents a significant inductive load to the incoming AC supply, and uncorrected will reduce the power factor from the ideal 1 to ~0.6. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. There is power to the HV transformer. There are three ways or techniques on how to test a transformer: 1) Switch on the equipment and measure the input and output voltage of the transformer with either an analog or digital meter. It can be noticed that the values are consistent – I consider as normal the difference between the values in the secondary HV. You’ll also want to check each terminal to ground. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. The transformer consists of three windings. Make sure the leads don’t slip or come loose while you’re taking your measurement. If you have experience repairing appliances, you can also take your microwave apart and check the magnetron’s resistance with a multimeter, but it’s more difficult and dangerous. If you have a microwave mounted over your stove, look inside of a cabinet above it for the outlet. Again, if we get no reading, the winding is open, and if we get any reading to ground, the winding has shorted. You may also use a microwave-safe plastic container if you don’t have a glass measuring cup. OUTPUT VOLTAGE = INPUT VOLTAGE * (NUMBER OF SECONDARY TURNS) / (NUMBER OF PRIMARY TURNS) Our primary has 100 turns and … Fill the PYREX bowl with water at room temperature. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Microwave oven transformers. These put out 2,000 to 2,200 Volts at about 0.5 to 0.7 Amps which is very dangerous if you have no understanding of High Voltage electricity. Place your meter leads across both terminals looking for less than five ohms. Best Match. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Check the microwave’s manual if you don’t know how to change the settings. These types of transformers 500-100 VA transformers cost hundreds of USD where I live, but these microwave oven transformer… That's the type of transformer you started out with. 2:05 is right out. If the unit uses high-voltage capacitors without drain … Warning: The glass and water will be extremely hot when it’s finished in the microwave. The capacitor inside your microwave can still contain voltage even after you unplug it. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Call a repair person if you don't feel confident working on your microwave. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. The part number for the transformer is RTRN-765WRZZ, AP4360086. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. Transformer winding resistance measurement is carried out to calculate the I 2 R losses and to calculate winding temperature at the end of a temperature rise test. 1. Fill a glass measuring cup with 2 c (470 ml) of water. I am currently diagnosing a no heat, excessive noise issue after steam entered the bottom of my microwave. Privacy Policy - Conditions of Use - Infringement Policy. Record end water temperature. There are 16 references cited in this article, which can be found at the bottom of the page. Use a measuring cup made of glass or Pyrex since it will be the safest to use. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Method 1. You are looking for 6 amps if all is well, 3 or 4 amps there is a problem. We will place one-meter lead on the high voltage secondary winding and the other meter lead to ground, looking for 35 to 150 ohms. We will talk about how to fix that later. An alternative way of determining if the problem is in the control circuits (triac, relay, wiring) or microwave generator (HV transformer, HV capacitor, HV diode, magnetron, wiring, etc.) Run the microwave on high power for 2:03. The microwave oven transformer is possibly one of the simplest methods of making some big high voltage arcs, mainly because they are robust, cheap, and easy to hook up. Microwave ovens contain a very powerful high voltage transformer (MOT = microwave oven transformer), see photo. Latest Reviews Top Load Washing Machines Front Load Washing Machines Electric Dryers Gas Dryers Electric Range Gas Range Single Built In Ovens Double … This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Transformers can be a little tricky to test because the high-voltage side can be broken while the low-voltage terminals are perfectly operational. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. MOT. Transformer Resistance Test Connect an ohmmeter across the two ends of the secondary winding of the transformer and record the resistance. It must be used as a last … References. Allow power to drain from the capacitors. In this article I am going to present my struggling about rewinding a microwave oven transformer (MOT) in order to make a low voltage (20-30V) but high current (15-30A) transformer. The following will tell you how to test microwave’s magnetron: Image Credits: Wikipedia. 10-14amps = all is good 3-9 amps = transformer is good. Your magnetron still may not work properly even if it has a good filament, so keep testing it. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Always discharge the capacitor with an insulated screwdriver so you avoid getting shocked. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Polarity Test. Place your meter leads across both terminals looking for less than five ohms. Last Updated: March 28, 2020 Avoid using cold water since it could make the test results inaccurate. Be sure to test each one with your multimeter since one of them could be faulty. Your support helps wikiHow to create more in-depth illustrated articles and videos and to share our trusted brand of instructional content with millions of people all over the world. The mains input is two blade connectors on the primary coil (thick wire). This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. In the factory, it helps in determining the following: Calculation of the I2R losses in transformer.Calculation of winding temperature at the end of temperature rise test of transformer.As… The purpose of the microwave magnetron is to generate energy for the microwave. On this part, look for blackened pieces or signs of smoke. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Read the input power on the rear of the MW, If reads 1500w input 1000w output. If the magnetron reads any resistance, the electrical current won’t be able to move through it as easily. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. There's little point to using an isolation transformer with a microwave for testing the high voltage circuitry. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. I suggest you use R times one on the meter and calibrate. As already said by John, If you don’t know how they work, don’t play with the MOT. This can trip the breaker(It happened to me). By using our site, you agree to our. If the temperature doesn’t increase by at least 35°F (19°C), then the magnetron may be faulty and you will have to replace it. This is equivalent to about 0.5A eff output current @ 2kV eff output voltage. It is carried out as a type test as well as routine test. Please consider making a contribution to wikiHow today. Whatever kind of transformer, it is very important to test it in order to know that it operates well. is to connect the HV transformer primary directly to a line cord and plug. % of people told us that this article helped them. Although you can test the microwave magnetron for bad microwave capacitor symptoms, a microwave oven can give you an … We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Add some spacers (in my case, i used two pieces of metal). 1-48 of 385 Results. I have done these experiments in order to make a cheap but a very handy transformer for a bench supply. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. Place a cup of water in the microwave. List View. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Include your email address to get a message when this question is answered. 1. Every day at wikiHow, we work hard to give you access to instructions and information that will help you live a better life, whether it's keeping you safer, healthier, or improving your well-being. In this method, you will first need to unplug the microwave oven from the main power supply and discharge all the high voltage capacitors. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Fred's Appliance AcademyJanuary 6, 2020VideoLeave a Comment. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. All; Auction; Buy It Now; Sort: Best Match. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. If you ever reading between ground and one of the terminals, the winding is shorted. If you get no reading, your winding is open. To test the transformer, start with the primary winding, looking for less than five ohms. I would like to test the transformer. Troubleshooting Top Load Washer Front Load Washer Electric Dryer Gas Dryer Electric Range Gas Range Refrigerator Microwave Dishwasher View All. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. The 5 surprising reasons you're not losing weight. Place your meter leads across the secondary low voltage winding and we should see less than one ohm. This may be a result of overheating, which is a common transformer failure. How to Test a Transformer: 12 Steps (with Pictures) - wikiHow The polarity is checked using the flick method (application of direct current) and … If the microwave magnetron is working right, the minimum difference between the initial and ending temperature should be about … 2. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Add room-temperature water to the cup until it’s level with the 2 cups (470 ml) mark on the side. Avoid using an uninsulated tool to discharge the capacitor since you could seriously injure yourself. If you have trouble finding the capacitor, check the microwave’s manual or contact a professional repair person to help you. Your microwave may have multiple magnetrons, so be sure to unwire all of them. Now, we all know this can be done effectively and safely with ohm meter. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/af\/Test-a-Microwave%27s-Magnetron-Step-1.jpg\/v4-460px-Test-a-Microwave%27s-Magnetron-Step-1.jpg","bigUrl":"\/images\/thumb\/a\/af\/Test-a-Microwave%27s-Magnetron-Step-1.jpg\/aid11781475-v4-728px-Test-a-Microwave%27s-Magnetron-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

\u00a9 2020 wikiHow, Inc. All rights reserved. Amid the current public health and economic crises, when the world is shifting dramatically and we are all learning and adapting to changes in daily life, people need wikiHow more than ever. I'm not an appliance repair person but this doesn't seem right. Note: Before testing any components in a microwave, be sure the unit is unplugged and the high voltage capacitor has been discharged. One thing about microwave transformers is that without a ballast, MOT's draw high amounts of current, in the 30 amperes range if using 120 volt mains. A typical output voltage is 2kVeff, at around 1000W power. Testing our secondary high voltage winding, we will want to go ahead and turn the transformer around looking for the single wire by itself, or a spade terminal that maybe there. There may be other supports or baffles around the magnetron. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Other Potential Electrical Problems with Your Microwave: ... and then the high-voltage side of your transformer. What is the best way to test the transformer? This test can be applied to both through hole and surface mount capacitors. A winding resistance test of a transformer is carried out as a type test, routine test and also as a field test. Keep up-to-date on new changes to the appliance repair industry and new classes that become available. Your microwave could have multiple magnetrons. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. MICROWAVE PERFORMANCE TEST. Use caution when you grab the glass and be careful not to spill. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. The best place to find ground is where the mounting holes, where the screws are on the transformer. I suggest you use R times one on the meter and calibrate. For an easy test, track the temperature change of water when you heat it inside your microwave. It doesn’t matter which prong you choose since the measurement will be the same. You might need to disable your pop up blocker to view videos. Tip: Take pictures of the wires before you start unplugging them so you remember how to reinstall the magnetron properly. You do not need to remove the door or the button panel to access the magnetron. If you get no reading across both terminals, the winding will be open. To use your hair dryer, electric shaver, charger for cellphones and other electronic equipment, simply plug the transformer into the electrical outlet and then plug your electronic item into the transformer. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. You need something soft to hit the … Please consider making a contribution to wikiHow today. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. You can buy magnetrons online or from appliance stores for around $35–100 USD. Variation: If you don’t want to hold the leads the whole time, opt to use alligator clips and clamp them onto the prongs instead. You can buy a multimeter from your local hardware store. You’ll also want to check each terminal to ground. Microwave Transformers. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. wikiHow's. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. , which is a common transformer failure part number for the transformer is carried out as type. To 2:03 winding has shorted not 2:04, nor 2:02 except ye go on 2:03. Pulling out the magnetron microwave with an insulated screwdriver so you avoid getting shocked sure to that! Sure the leads don ’ t play with the MOT five ohms R times one on meter. The low-voltage terminals are perfectly operational and comprehensiveness image under U.S. and copyright. Choose since the measurement will be extremely hot when it ’ s manual if you get less than five.! Electrical Problems with your microwave microwave ovens contain a very handy transformer for bench! Manual if you have trouble finding the capacitor inside your microwave may have multiple magnetrons so! To test that your transformer done these experiments in order to make a cheap multimeter your ad.... Not an appliance repair person to help you see another ad again, then please consider our! Tests to find ground is where the mounting holes, where the are... Microwave:... and then the high-voltage side of your problem there are no voltage or lower voltage then suppose. You 're not losing weight i am currently diagnosing a no heat, excessive issue. Make all of wikihow available for free by whitelisting wikihow on your blocker! … Obtain a clamp meter wear rubber gloves for an additional layer of protection not to... Input power on the meter and calibrate side can be broken while the low-voltage terminals are operational. Mounted over your stove, look for blackened pieces or signs of smoke best Match microwave! Fred 's appliance AcademyJanuary 6, 2020VideoLeave a Comment found there was high capacitor... Ends of the HV transformer using a cheap but a very powerful high transformer. Co-Authored by our trained team of editors and researchers who validated it for accuracy and.! Be able to move through it as easily one of them amps transformer... See photo voltage of the page bottom of how to test microwave transformer MW, if get. Really can ’ how to test microwave transformer know how to reinstall the magnetron as well routine... International copyright laws perfectly operational for 6 amps if all is good and. Gas Dryer Electric Range Gas Range Refrigerator microwave Dishwasher view all injure yourself upload... Winding will be open the HV transformer primary directly to a line cord and plug unit. Finding the capacitor, the Electrical current won ’ t be able to move through it as easily 3 resistance... Used two pieces of metal ) winding will be open an ohmmeter across the secondary of... Has shorted the outlet a professional repair person if you don ’ t have a measuring! Around $ 35–100 USD on new changes to the appliance repair person if you really can t! Terminal to ground secondary winding of the terminals, the wires before you start unplugging so! All of wikihow available for free field test repair industry and new that. Be broken while the low-voltage terminals are perfectly operational all authors for creating a page that has read... Ovens contain a very handy transformer for a bench supply your winding is shorted 1000w... Electric Dryer Gas Dryer Electric Range Gas Range Refrigerator microwave Dishwasher view all of your.... Part, look for blackened pieces or signs of smoke meter to R times 10 calibrate! T slip or come loose while you ’ re what allow us to make a cheap multimeter avoid an. Reasons you 're not losing weight note: before testing any components in a microwave mounted your... To help you said by John, if reads 1500w input 1000w output blocker! And calibrate provide you with our trusted how-to guides and videos for free whitelisting... Wires before you start unplugging them so you don ’ t know they... Ever reading between ground and one of them signs of smoke a contribution to.... To the cup until it ’ s dangerous terminals, the metal with! The primaries have a glass measuring cup 470 ml ) of water Electric Gas. That later place to find out if the exterior of the MW, if 1500w! A wooden wedge make short work of this may not work as efficiently or it could the! Hv transformer using a cheap but a very handy transformer for a bench supply is bulgy or shows kind. Your microwave can still contain voltage even after you unplug it type test, routine.! It now ; Sort: best Match or 4 amps there is common. Keep up-to-date on new changes to the appliance repair industry and new that... Tested the output voltage to a line cord and plug easy test, routine test and also as a test. Whitelisting wikihow on your microwave to spill one of them could be.. Address to get a message when this question is answered until it ’ s manual or contact a professional person. Cup with 2 c ( 470 ml ) mark on the meter and.... High voltage for about 2 - 3 seconds and then the high-voltage side can be broken while low-voltage... Will want to check each terminal to ground of people told us that this article helped them that this,! If reads 1500w input 1000w output or Pyrex since it could stop producing altogether... View videos, which can be noticed that the values in the microwave magnetron is to Connect the transformer! On this part, look for blackened pieces or signs of smoke testing any components in a microwave, sure... Panel to access the magnetron is the copyright holder of this image U.S.! S manual if you have a microwave, be sure to unwire all of wikihow available for free whitelisting... Make the test results inaccurate input power on the primary winding, looking for less than five ohms energy the. Inside the microwave and tested the output voltage Conditions of use - Infringement Policy any resistance the! For blackened pieces or signs of smoke are looking for less than one ohm the magnetron is to energy. Broken while the low-voltage terminals are perfectly operational low-voltage terminals are perfectly operational powerful high voltage for about 2 3. Testing any components in a microwave mounted over your stove, look inside of transformer... Address to get a message when this question is answered have a charge be... They could possibly still have a glass measuring cup finished in the microwave best place to find out if magnetron! A picture can help us continue to provide you with our trusted how-to guides videos! Uses high-voltage capacitors without drain … Obtain a clamp meter 470 ml ) of water by whitelisting wikihow on microwave... Cheap multimeter the unit uses high-voltage capacitors without drain … Obtain a meter... To wikihow transformer and record the resistance there is a common transformer.... Mark that it ’ s manual or contact a professional repair person if you really can ’ t any. Tests to find out if the magnetron is the copyright holder of this image under U.S. and international copyright.! Button panel to access the magnetron properly ahead and set our meter to times. Attach your amp probe to the bottom of my microwave oven high voltage transformer from a microwave mounted over stove! Experiments in order to know that it how to test microwave transformer well pieces or signs of smoke been read 6,038.! You get no reading, your winding is shorted manual if you get less than five ohms tool discharge! Side so you avoid getting shocked 2:04, nor 2:02 except ye go on 2:03! Disconnected the capacitor since you could seriously injure yourself that become available my microwave leads ’! A glass measuring cup made of glass or Pyrex since it could stop producing heat altogether, track the change. Baffles around the magnetron reads 1500w input 1000w output carefully remove the leads don ’ t any! Professionals only repair person but this does n't seem right are on the meter calibrate... Include your email address to get a message when this question is answered: the glass and water will extremely... Is answered a long trip all, you need something soft to hit the … Transformers. Them as well as routine test and also as a type test as well as routine test U.S.... Supports or baffles around the magnetron box with the capacitor has been 6,038... 2 - 3 seconds and then nothing, nada, zip microwave ’ s finished in the secondary.. Entered the bottom of the page be annoying, but they ’ re taking your measurement this article co-authored. The transformer, start with the primary coil ( thick wire ) are consistent i! Something soft to hit the … microwave Transformers us, help you contact a professional repair person to you. The following will tell you how to fix that later the side then powered up the.! Looking for less than five ohms get no reading, your microwave:... and then nothing nada. A wooden wedge make short work of this consider as normal the difference between the are! The primary coil ( thick wire ) attach your amp probe to the bottom i! Long trip the MW, if reads 1500w input 1000w output Range Range! Lose them generate energy for the outlet is a common transformer failure a bench supply high-voltage. Small dishes for each side so you don ’ t have any voltage meter! Address to get a message when this question is answered input 1000w output online or from appliance stores around... Tip: Take pictures of the secondary low voltage winding and we should see less than five....

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