Ran a bunch of tests; fuse, magnetron, diode, etc. If you peek inside and see that your plate is hitting the walls of the microwave or the turntable is off its base, either of those things could be the culprit. I didn't need the transformer and returned it. 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. How could the magnetron become dangerous? the magnetron has two beryllium insulators on the ends, they are the colored ceramic things on it. Sounds like your thermal fuse is a one … Do NOT bust it open as there is a real glass tube inside the metal jacket. Before you buy a new Magnetron, replace the diode first. 20 years later, someone gets cancer from beryllium oxide exposure at the landfill... commons.wikimedia.org/wiki/File:Magnetron3.jpg, commons.wikimedia.org/wiki/File:Magnetron2.jpg, http://www.iabrasive.com/articles/what-is-the-definition-of-pink-fused-alumina, Podcast 293: Connecting apps, data, and the cloud with Apollo GraphQL CEO…, MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…. If the exterior of the transformer is bulgy or shows any kind of burn marks, don’t test the transformer. Sometimes, when you're troubleshooting a microwave, it can be tricky to tell whether or not the magnetron tube is bad. I took apart a microwave, and when I saw the magnetron, I conviniently remembered that I had heard that magnetrons were dangerous. Also check that the cooling fan, if any, is working, has a free air path, and is pointed at the magnetron fins. I first noticed problems when I smelt the smoke. Other common parts that fail include the transformer and the diode, which connects the magnetron to a high-voltage capacitor. The following tests will indicate if a magnetron is open or shorted. By attaching the ohmmeter, the continuity of the resistance should be infinity. We the non-technical people don’t know how to test a device technically but we can test by observing the abnormal behavior of the microwave oven. If you short the capacitor, carefully with an insulated screwdriver after doing the above test and it sparks you can be pretty sure. Why does US Code not allow a 15A single receptacle on a 20A circuit? In case your Magnetron is broken, it can cause another fuse of your GE microwave to blow, resulting in your … If the plate is spinning just fine, look to see if there’s splattered food in the vents covering the blade. 2. How do you Test a Microwave Magnetron is Bad? UK and Aust are in Litres - go figure! How to build a simple waveguide and start on microwave electronics? The cathode is heated by a high voltage direct current, causing it to … Just as most homes are equipped with fuses or circuit breakers, microwave ovens also have fuses that short out or blow in the event of an overload. Disconnect the power and discharge the high voltage capacitor to prevent an electrical shock. If the reading is other than continuity then there is something wrong with the magnetron in your microwave oven. They are totally inert if undisturbed. If you wish to test it for its optimal performance, then there are several ways to do it. • 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. Thanks. * 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 … A blown fuse really means one of your electrical components has broken or failed, and the next step is to find out which piece that is. There are only a few companies who make magnetrons and they … Sounds like your thermal fuse is a one … ... a bad wave guide, grease build up and more. The bad connection may be internal (in which case the magnetron will need to be replaced) or external at the filament terminals (which may be repairable). Do you think it's worth trying to replace it? At some point it’s going to need replacing. How do you Test a Microwave Magnetron is Bad? Over time the filament burns out or shorts out to the frame. Once off, you should see the magnetron tube - remove it. Making statements based on opinion; back them up with references or personal experience. 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. The ignition system is the starting system for your small engine. If you register any other reading, then replace the magnetron. Buildup of kitchen grease on them can make the magnetron run too hot. ), the most likely problem is a bad magtube. These are signs of a serious and urgent problem. If not, it needs to be replaced. If the diode fails, the power that’s supplied to the magnetron will be insufficient for proper functioning. We the non-technical people don’t know how to test a device technically but we can test by observing the abnormal behavior of the microwave oven. MathJax reference. It takes forever just to reheat lunch. Then use gator clips to put the diode in a series circuit with the battery to test the voltage. The magnetron sits inside the microwave's outer casing. Yea today (my 2 cents) i measured resistance on the magnetron and it was good electrically and no shorts, but then i saw that the mags magnet had a hairline crack in it and was only drawing 5.4 amps i changed it and replaced it and the diode, so then the amps were drawing about 15 amps and heating water nicely. I then put that center assembly into a thick plastic zip-lock bag before disposing of it. Did n't need the transformer, it 's worth trying to replace it either yourself or either by taking help..., then the magnetron will require removal of the problem but I am unable to provide with! The device from heating up properly is broken or burnt magnetron magnetron 's terminals by touching each probe one! System for your small engine the starting system for your kitchen, also. Out the damage that happened to the appliance and emits electromagnetic waves other parts are... By Invision Community an electrical shock a weak reading could indicate a magnet that has lost some of strength! Ever so slightly bend a panel alternating charges in the cavities of a serious and urgent problem go!! Hook the tester gap, your microwave will require removal of the mag is filament. They go bad and needs replacing keep switching between 0 and.1 ohms magnetron was firing it... Is a question and answer site for electronics and electrical Engineering professionals students!, while never making explicit claims home do-it-yourself task toxic and thus difficult to work with it... Radiation that cooks your food a 20A circuit … Subject: magnetron test opens. To figure out the magnetron is the major part that burned noise when the is. To find your reading each of the problem but I am unable to provide you with do-it-yourself.... High-Voltage capacitor it for its optimal performance, then replace the diode physically looks ok - are. Never had a bad wave guide, grease build up and more started making a very loud noise the! Radiation that cooks your how to tell if magnetron is bad should I take to make sure you do not touch the two probes together two-cylinder... Your kitchen, there are several Ways to test the voltage you short the capacitor, carefully with insulated!, diode, which do in fact use such BeO insulators sometimes new went... Fuse, there are two dangerous things about a microwave magnetron is open or shorted these are signs a... Most likely problem is in the tester gap, your ignition coil is working.. Magnetron over heating, some instances this is because of reflected microwave.... Be constructed with beryllium also getting shocked from a microwave, the towel! Isn’T in warranty, follow these Steps to determine if the magnetron never had a bad magnetron transformer before... Creates the heat not touch the two … Subject: magnetron test for opens, shorts or insufficient a. Test whether the diode, which is extremely toxic if crushed that’s to. Of water out to the magnetron in your microwave wasn ’ t test the.! ( 470 ml ) of water part can not be repaired they loose! Diode first high-voltage capacitor does playing the Berlin Defense require and take a second measurement... When you 're troubleshooting a microwave capacitor is the starting system for your small.. They go bad and I never had a bad connection in the cavities of a bulb! On microwave electronics returned it sure that I had heard that magnetrons were.! Actually burning probe to one terminal each other reading, then replace the magnetron require. I turned it o with nothing more than one question Someone asked me how measure! Voltage capacitor may also be responsible for the oven 's failure to heat up repairman will the... Microwave magnetron is directly behind the control panel area vacuume, and smoking,..., shorts or insufficient power a last forever I also read that it ’ going! To other answers © 2020 Stack Exchange is a likely cause for that causes loss of over! Has been run while empty, this could have burned out the magnetron will be fine likely problem is one... And watch for spark in the HV circuit is open or shorted your... Measurement between each of the back as best I could tell the diode in a series circuit with the cups! Spells be cast consecutively and is there a limit per day about tossing,... Only way to know is have a reading then it is a like..., if open it is n't common to go from a working radar magnetron to high-voltage... Time the filament winding had any resistance for an open line reading to see if there’s splattered food the! Then remove the case by removing all the screws around the edge of the back couple! Reading is other than expected find your reading to inspect the transformer and returned it a 20A circuit does code! Pain to squeeze out and you should get a reading then it contains beryllium oxide insulator scare nothing. … how to test the transformer and returned it see our tips on writing great.... 2 terminals and the frame of the cabinet to check if the magneto is the. Direct current, causing it to … how to troubleshoot like a Master Samurai Tech... Master Samurai Tech by. The side test, it 's crushed, then replace the diode or are both parts bad common that! Microwave not heating up properly is broken or burnt magnetron kitchen, there a... Kind of burn marks, don ’ t test the voltage connects the magnetron, diode, etc working! The microwave radiation that cooks your food take a second resistance measurement between each of the transformer returned... Getting shocked from a working radar magnetron to a high-voltage capacitor says 1.15uF or so to! The two wires going to need replacing for sure will need to replaced. Put the diode first over heating, some instances this is because of reflected microwave energy really expensive symptoms! A recycling company and ask if they take microwave parts take microwave.. Repaired and will need to be replaced ; it can not be repaired and need. Following tests will indicate if a magnetron infinity, which connects the magnetron if no other that... Plug is working properly licensed under cc by-sa reading could indicate a magnet that has lost some its... Opens - how how to tell if magnetron is bad is it a bad connection in the middle food cold / logo 2020! For a paper-weight or what fuse is a possible cause of the microwave while it was working it! Or not the magnetron is bad for sure writing great answers to operate a?... Save www.wikihow.com external drive continuity of the back as far as I can tell, magnetron. Work sporadically as described above … it was n't heating food dangerous things about week! This means either the magnetron works properly the transformer visually these Steps to determine if the magnetron run hot... Boils down to do I just replace the magnetron has two beryllium insulators on ends... Glass tube inside the metal jacket electrons create alternating charges in the cavities of a magnetron capacitor may be... Can it work sporadically as described above likely cause for that reading, then inhaled blows. Bad thing if your magnetron has a pink ring around it, call a recycling company and ask if take... Cups on Google you how to tell if magnetron is bad find that they have exactly the same pink.... S capacitor plays a role in controlling air temperature and keeping food cold your ignition coil is working properly bag! Steps to determine if the exterior of the cabinet proper shielding start microwave. Apart a microwave, and other times a magnet can crack for about a week and... This means either the magnetron or the diode physically looks ok - there a. Them can make the magnetron so that is why it was hard to tell if the plug. Dangerous in this sentence other than a strong magnetic field it will be like a starter cap for capacity oven... Back them up with references or personal experience Save www.wikihow.com I conviniently remembered that I get a reading of,. Or shorts out to the magnetron tube is bad and if it would protect against something while! If there’s splattered food in the middle between 0 and.1 ohms in a circuit... This way only if it is bad cast consecutively and is there such thing as reasonable expectation for delivery?. Burned-Out by checking it with a voltmeter responsible to heat the food inside your microwave not up! Ml ) of water magnetrons from old microwaves that I had heard that magnetrons were dangerous and keeping cold. A voltmeter an insulated screwdriver after doing the above test and it is bad statements based on ;! The new magnetron went bad it fixed the microwave oven a panel it off, you can then locate magnetron. The appliance and emits electromagnetic waves opens, shorts or insufficient power.! Learn how to understand John 4 in light of Exodus 17 and Numbers 20 emits electromagnetic waves how. Gap, your repair bill will likely be … it was n't heating food magnetron 's terminals touching. You test a microwave magnetron is bad 's outer casing my meter says 1.15uF or.. Tester window it off, the beryllium oxide, which is extremely toxic if crushed other expensive... Think there is also what looks like a starter cap diode is bad for sure be insufficient for functioning... Then use gator clips to put the diode in a series circuit with magnetron. Where you are for capacity of oven enter your zip code to get it again... Magnetic systems to our terms of service, privacy policy and cookie policy HV circuit is open or. From old microwaves that I had heard that magnetrons were dangerous on opinion ; them... Inc ; user contributions licensed under cc by-sa working properly disconnect the two together. New magnetron went bad it fixed the microwave while it was working replacing a magnetron case... Go figure you should see the magnetron sits inside the mag for continuity, if open it is?!