how to tell if magnetron is bad

If this part fails, it’s wise to have a professional diagnose and repair the unit because it can be dangerous to make this repair. I take apart magnetrons from old microwaves that I get for free and harvest the magnets, they are cool and powerful. Sounds like your thermal fuse is a one … I didn't need the transformer and returned it. Sometimes, when you're troubleshooting a microwave, it can be tricky to tell whether or not the magnetron tube is bad. Other common parts that fail include the transformer and the diode, which connects the magnetron to a high-voltage capacitor. There are two dangerous things about a microwave oven: 1st, the microwaves. I first noticed problems when I smelt the smoke. If the two probes touch, you will get an inaccurate reading, and you won't know if the magnetron is working or not. How to Test a Capacitor for a Freezer. To learn more, see our tips on writing great answers. [1] Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. It was hard to tell if the filament winding had any resistance. Then pull the two wires of the magtube and make sure the are away from everything and start it up again and see what the amp reading is, (I got around 5.6 amps and the heavy vibration noise wasn't there any more). By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Under 3 amps the problem is in the LV circuit. Set your ohmmeter to the lowest resistance scale. Hook the tester up between the ignition cable and the spark plug and start the engine. I saw a video of a microwave with a bad lower switch where the table top would turn and the interior light would be on when the microwave was turned on. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. « Reply … Stop what you’re doing, and turn off and unplug the … Workings of a microwave oven magnetron transformer. Reply. I check the mag for shorts between them 2 terminals and the frame of the mag. Step 2: Spin the flywheel rapidly (at least 350 RPM) and watch for spark in the tester window. Although the magnetron thermal cut-off switch doesn't appear to be bad because it is reading 0.10 ohms at room temperature, you do bring up an interesting question. Thanks for contributing an answer to Electrical Engineering Stack Exchange! How much theoretical knowledge does playing the Berlin Defense require? A freezer’s capacitor plays a role in controlling air temperature and keeping food cold. If this part fails, it’s wise to have a professional diagnose and repair the unit because it can be dangerous to make this repair. If so, take an amp reading and see how many amps the unit is drawing, (the one I worked on only came up to around 2.4 - 2.6 amps), and you could smell that burning magtube smell after a minute or so of running. If you search for alumina TIG cups on Google you will find that they have exactly the same pink colour. When this tube fails, it must be replaced; it cannot be repaired. Solution: Replace the magnetron and change the terminals making sure they fit properly. I tested the diode and it is bad for sure. What precautions should I take to make sure that I'm safe? Somehow I turned it o with nothing more than a paper towel in it. For two-cylinder engines, you should test each cylinder to make sure you do not have a bad connection in the HV wires. Look on greenergadgets.org and enter your zip code to get a lot of good places. I decided to research this a bit further (I know, great timing) and I found that some magnetrons contains berilyum oxide, which is fatal if you breathe it in. Magnetrons going bad normally will be like a light bulb that goes dimmer and dimmer until it goes out. A blown fuse is one of the most common problems a microwave can have, but that’s just the indication that something has gone wrong. If it has an electrical leak, it … With low-cost microwaves, your repair bill will likely be … Inside the mag is a filament like that of a light bulb. In the case with many GE microwaves, the magnetron can test good according to the filament resistance specifications yet fail when you're actually trying to get the damn thing to heat up your bagel. If I get a reading then it is bad. They are totally inert if undisturbed. Microwave starts working when door opens - how dangerous is it? Fill a glass measuring cup with 2 c (470 ml) of water. I find it pretty hard to believe your average microwave would be constructed with beryllium. Why do exploration spacecraft like Voyager 1 and 2 go through the asteroid belt, and not over or below it? I took apart a microwave, and when I saw the magnetron, I conviniently remembered that I had heard that magnetrons were dangerous. It is a pain to squeeze out and you may have to ever so slightly bend a panel. Then use gator clips to put the diode in a series circuit with the battery to test the voltage. Subject: Magnetron Test for Opens, shorts or Insufficient Power A. If you listen carefully when a magtube ramps up power, (you will here a real light buzz noise after the filament warms up), you will see how that corresponds to the amp raise. Although the magnetron thermal cut-off switch doesn't appear to be bad because it is reading 0.10 ohms at room temperature, you do bring up an interesting question. A magnetron can be considered as the heart of the microwave as it produces RF energy which is radiated into cooking cavity where food absorbs it. If it is faulty or defected, you can replace it either yourself or either by taking professional help. Whatever kind of transformer, it is very important to test it in order to know that it operates well. It was hard to tell if the filament winding had any resistance. I thought nothing should work if a switch was bad. In most microwaves, the magnetron creates the heat. 0. sverige. How can I install a bootable Windows 10 to an external drive? Here is the sort of set-up you need to assemble your beryllium component safely: I really don't think a $20 microwave oven is going to go through that. Do not turn it on without a proper, closed, grounded casing. @skillz21 J. Raefield's answer covers that pretty well. If it is not burnt, it still might be bad, so follow the rest of the sections. Hook the tester up between the ignition cable and the spark plug and start the engine. Sometimes, when you're troubleshooting a microwave, it can be tricky to tell whether or not the magnetron tube is bad. Use a measuring cup made of glass or Pyrex since it will be the safest to use. I check the mag for continuity, if open it is bad. If it is faulty or defected, you can replace it either yourself or either by taking professional help. This part cannot be repaired and will need to be replaced. As best I could tell the diode was bad so I replaced it. If you register any other reading, then replace the magnetron. If you wish to test it for its optimal performance, then there are several ways to do it. Then remove the case by removing all the screws around the edge of the back. Once off, you should see the magnetron tube - remove it. How do you Test a Microwave Magnetron is Bad? 4 years ago Reply Upvote. Another cause of your microwave not heating up properly is broken or burnt Magnetron. If the reading is other than continuity then there is something wrong with the magnetron in your microwave oven. Source: Advantium 220 microwave electrical burning smell. I've repaired a few dozens of microwave ovens including ones with bad magnetron's, I have never been curious enough to break the filament connector though. What causes loss of power over lifetime of a magnetron? Read the screen on the multimeter to find your reading. The magnetron is the major part that is responsible to heat the food inside your microwave. Also check that the cooling fan, if any, is working, has a free air path, and is pointed at the magnetron fins. Reference the image below, the beryllium oxide parts are the pink items in the middle. Only way to know is have a look inside. We have placed cookies on your device to help make this website better. Add room-temperature water to the cup until it’s level with the 2 cups (470 ml) mark on the side. Put a glass of water in the microwave. Do you also notice what seems to be a louder then normal buzzing/vibrating noise. The Procedure for Testing the Diode, or Rectifier, of Your Magnetron: Get a nine-volt battery and insert the readers of your voltmeter as a standard. Whether you start the engine with a pull rope or the turn of a key on an electric start motor, you're relying on the ignition system to produce a spark inside the combustion chamber. Can you compare nullptr to other pointers for order? Some magnetrons use beryllium oxide as the "ceramic" looking insulators inside of the ring magnets on both the "Stem" and the "Antenna" ends. As seen to the left here. When a magnetron goes, does it go completely or can it work sporadically as described above? Are you going to use it for a paper-weight or what? Use MathJax to format equations. A weak reading could indicate a magnet that has lost some of its strength. What is the importance of probabilistic machine learning? Disconnect the power and discharge the high voltage capacitor to prevent an electrical shock. The microwave started making a very loud noise when the magnetron was firing and it wasn't heating food. Can the Master Ball be traded as a held item? The magnetron is more likely to fail than the capacitor. Feb 13, 2011 #6 Sometimes people replace the magneto coil, thinking it was bad, but all the while it was just a bad ground … I did buy a replacement microwave, but regret it. I took apart a microwave, and when I saw the magnetron, I conviniently remembered that I had heard that magnetrons were dangerous. Make sure that you do not touch the two probes together. UK and Aust are in Litres - go figure! So if it is not broken and I don't want to open it, and I haven't thrown it around, I'm good? Thanks. Fill a glass measuring cup with 2 c (470 ml) of water. Not all magnetrons use that for the insulators, but it's virtually impossible to tell if they did so you must assume they do. At some point it’s going to need replacing. • Unplug the unit • Discharge all the H.V Capacitors (refer to service manual on how to discharge) • Disconnect all the leads (connectors) from the magnetron terminals. I suppose my question boils down to do I just replace the diode or are both parts bad. Check with your boat or small engine … Drive a magnetron with low power via a CCFL backlight driver, I made mistakes during a project, which has resulted in the client denying payment to my company. If no abnormal noises and no smell with magtube disconnected, (MAKE SURE BOTH WIRES THAT ARE DISCONNECTED FROM THE MAGTUBE ARE SAFELY AWAY FROM EVERYTHING AND MAKE SURE NOT TO GET NEAR THEM!!!!!!! @skillz21 If your magnetron has a pink ring around it, then it contains beryllium oxide, which is extremely toxic if crushed. * A magnetron with with a short between the filament/cathode and anode will likely result in a loud hum from the HV transformer and/or magnetron when the cook … If the supply is gone bad has different effects of different situation. Do NOT bust it open as there is a real glass tube inside the metal jacket. ... (You know better than that!) The dust from these WILL give you cancer. The question is when? Now that you know the two main ways to test a magnetron, you will be able to decide whether your magnetron has a scope for repair or whether it is completely defected. ), the most likely problem is a bad magtube. Then use gator clips to put the diode in a series circuit with the battery to test the voltage. Disconnect the two wires going to the magtube and set it for 20-30 seconds and run it. The microwave worked for about a week, and then started working intermittently, now it does not heat at all again. Derivation of curl of magnetic field in Griffiths. also getting shocked from a microwave capacitor is the most unpleasant … The magnetron has an electrical leak. This may be a result of overheating, which is a common transformer … It's rated at 1uF, and my meter says 1.15uF or so. I also read that it is dangerous in this way only if it's crushed, then inhaled. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Buildup of kitchen grease on them can make the magnetron run too hot. #3: Magnetron Failure. In most microwaves, the magnetron creates the heat. Other common parts that fail include the transformer and the diode, which connects the magnetron to a high-voltage capacitor. In case your Magnetron is broken, it can cause another fuse of your GE microwave to blow, resulting in your … I tried this once. First of all, you need to inspect the transformer visually. My main question is did the magnatron possibly go bad and arc causing the diode to blow, or would the diode going bad cause the magnatron to arc.

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