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microwave keeps blowing diode
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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. I have a GE JVM1540DM2BB over the range microwave which keeps blowing a fuse. There is a risk of getting electrocuted. Never test and use a multimeter on the appliance with it still plugged into the mains. “What is the function of the high voltage diode in a microwave oven?” This is a half-wave, voltage doubling rectifier circuit. When the live end of the secondary HV winding is positive, the diode is forward biased, shorting the magnetron. Replace the magnetron if your tests prove it to be defective. Groups: Registered Joined: 11/2/2010(UTC) Posts: 6. You risk electrocuting yourself if you neglect to do this. It does not heat. To take the measurement, disconnect the magnetron's connectors and place the multimeter's probes on its terminals. Make absolutely sure you remember to follow the safety instructions provided at the beginning of this article. Attach your amp probe to the line splitter, plug in and run microwave 10-20 seconds. microwave diode keeps blowing?? Whether it is shorted or open, a defective diode will most likely show some sign of defect. Without high voltage testing equipment and some skill in using it, you can only test each component for a short by measuring the resistance to ground. Upon exam i found bad hv diode. I used 9v battery testing method with cheapy multimeter, and a Fluke 87V to test the HV diode. Microwave oven cavity paint, waveguide cover mica sheets, and even some replacement doors are available from the parts suppliers listed at the end of this document. One end of the transformer connects directly to the appliance's ground. It is powered by the electrical current supplied to the appliance and emits electromagnetic waves. The microwave could have faulty switches in the door, a bad magnetron, faulty internal circuitry (such as a diode, capacitor, or transistor), or a blown fuse. When you first open the microwave up, make sure you short circuit the capacitor using a pair of electrically insulated pliers (with the appliance unplugged from the mains of course). You can also check whether the motor is leaking electricity or not by placing one of the multimeter's probes (still in ohmmeter mode) on the appliance's metal chassis and the other on one of the motor's terminals. If you get a continuity reading (a value is displayed), this means the motor is faulty. Originaly I heard a popping sound and then the microwave got louder and quit heating food. We also recommend wearing a pair of electrically insulated gloves to ensure you are able to work in complete safety. Options. Originaly I heard a popping sound and then the microwave got louder and quit heating food. Both methods show the diode is okay. Your meter needs to be using a 9-volt battery. Do not try to repair a microwave … You can check the motor using a multimeter in ohmmeter mode. If you do not obtain any values, this confirms there is no electrical leak. I have seen some of the higher rated Microwaves blowing the CL01s, and working using CL04-12 diodes only rated at a little higher, 450 mAmps. The interference suppressor is needed to protect the appliance from possible electronic malfunctions. Discharge the capacitor as described earlier in the article, and then test it by removing the leads and setting the VOM to RX100. Otherwise, you run the risk of getting electrocuted. It basically the thermo cut-off sensor. The cooling fan might have died or lost its effectiveness. You can check the condition of this component, but ensure you pay strict attention to the safety instructions when doing so. To do this, place one of the multimeter's probes on one of the capacitor's terminals and the other probe on the appliance's metal frame/casing. If the noise persists, identify and rectify the source starting with the motor drive followed by the drive coupler, magnetron, and so on. If not, then that most likely means your microwave does not have a dedicated circuit. If the door switches are new and the capacitor has been replaced, that really only leaves the magnetron. An object might have gotten lodged in the fan and stopped it from rotating. Begin by disconnecting the microwave from the electricity supply and discharging the capacitor. Check in your breaker box to see if the breaker that keeps tripping has the word “Microwave” next to it. If so, it has a dedicated circuit. If the HV diode is short-circuiting or leaking electricity, your appliance may make a loud noise and could end up blowing the fuse or tripping the circuit. Secure payment Credit Card, PayPal and bankwire, Fast delivery International home delivery, Money-back guarantee Free returns : 30 days to change your mind. SOS Accessoire cannot be held responsible for any accidents that may occur. However, make sure you follow the safety instructions detailed above if you decide to do this. I disassembled the microwave and tested HV diode, capacitor, transformer, and magnetron. The capacitor or diode may be bad. Plug in a lamp at the same outlet and see if it gets power. Welcome Guest! The capacitor stores energy then releases it in an amplified state. If the resistance stays high, the diode is stuck open and needs to be replaced. You might be running too many appliances on the same circuit, or the oven could be defective. A diode or rectifier should cause a voltage drop, in this circumstance one of approximately 3 volts. Microwave then heated for about 3 min. One end of it connects to the capacitor and the other to your microwave's ground. Your Microwave Keeps Blowing Fuses Check the door switch as described above. If your microwave is making an unusual or loud humming noise, you may have a problem with the high voltage diode. The capacitor check good. Microwaves use a diode to convert incoming A/C power to the D/C power that the microwave needs. Place a cup of water in the microwave. A three years old microwave stopped heating up. ... Have a microwave amana that keeps blowing internal fuses. If any of the door latch hooks is broken or any of the switches is faulty, the appliance will not operate. And diode went bad again. We recommend taking a look at the socket to see whether it might have melted. If your microwave constantly trips the breaker, check to be sure the microwave has a its own dedicated circuit. Important: do not forget to follow the safety instructions provided at the beginning of this troubleshooting guide. The magnetron is more likely to fail than the capacitor. Under 3 amps the problem is in the LV circuit. However, as the wattage of the newer Microwaves gets higher, the HV diode must meet the requirements of the circuit to work without breaking down too early, or failing entirely. Replaced the diode, the microwave worked for about a week, then showed the same problem. Contact us ! Checked the circuit (I am an engineer, so no worries about high voltages), found a failed diode. Disconnect all the electrical connectors and place the multimeter's two probes on the microswitches' terminals. If the value you obtain is around zero, the magnetron is working correctly and is not the source of the fault. Disconnect the connectors from the capacitor then place the tips of your multimeter's probes (in ohmmeter mode) on each of the capacitor's terminals. If not, the problem is more likely a circuit breaker than the oven. The more common of the 2 parts to fail is the capacitor. And if it blows the fuse for your kitchen, there also is a likely cause for that. Remove the cabinet and discharge the high voltage capacitor to avoid getting an electrical shock. Then locate the turntable motor, which will be underneath the appliance. Your microwave's timer will be either mechanical or electronic in design. If the transformer is defective, the appliance will make a lot of noise and could trip the circuit or blow a fuse. You can also check whether the capacitor has an electrical leak or not. The main fuse was blown. The diode and capacitor do not usually fail in this manner, so I suspect you have an issue with the transformer or the magnetron. Access to the diode will require removal of the cabinet. Before checking and testing this component, carefully read the safety instructions provided at the beginning of this article. There is only 1 diode in a microwave. The magnetron sits inside the microwave's outer casing. Anyone attempting to repair their own Microwave must remember that they can hurt or kill you. It's possible that when you put your food in the microwave, liquid of some kind ran under the turntable and you then forgot to clean it up. The high voltage diode is made up of a stack of eight diodes. When the diode fails, it is often visibly burned out. Make absolutely sure you carefully follow the safety instructions provided at the beginning of this troubleshooting guide. 3-9 amps = transformer is good. If you can't unplug your microwave, the socket and plug may have fused together, in which case you'll need to turn of the electricity supply and try applying a little force to get them to come apart. I get its power back on by replacing the "flame sensor" which GE named. Never test these components without first disconnecting the appliance from the electricity supply and discharging the capacitor. Microwave Diode: Isolate the capacitor and check for resistance on the most sensitive scale. The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. If it keeps throwing the breaker, though, you should check why. How to test a microwave high voltage diode with a multimeter. I have checked the magnetron, it reads less than one ohm reading both terminals. Here, we're going to help you work out where this problem is coming from so you can resolve it. Everything except the diode cheked out OK. The diode also has the job of increasing the voltage that powers the heart of the microwave, the magnetron. Disconnect your appliance from the power source; you will be handling electrical components. If so, then you need to replace the magnetron because it's just pulling too much power. You can contact us via e-mail if you have any questions ! As it happens, I have replaced the microwave with a Samsung one as the Sainsburies one happened to be just over a year old - so out of warranty. However, you don't need to use the exact combined part - which may be very expensive or difficult to obtain. I have been working on a maytag o/r microwave. door open or door closed).Make absolutely sure you remember to follow the safety instructions provided at the beginning of this article. This high voltage powers the magnetron to heat the food. if you don't obtain a value, the capacitor is defective. Frequently when a transformer goes bad it will also smoke or burn up. Next, locate and remove the high voltage diode in order to test it for continuity. Emerson microwave blows fuses. I tested the diode and there is no continuity in either direction - i presume blown. NOTE: Before you test your diode, make sure your microwave is unplugged, and that you discharge the microwave's capacitor. Complaint was no heat. Carry out this same test on each of the capacitor's terminals. If your microwave oven blows a fuse, there are a couple possible causes. Reads open to each terminal to ground. If the oven goes a long time between blown fuses, this might be the reason. I replaced with a universal diode. Repairing internal faults is dangerous and requires special training and tools. Next, disconnect all the connectors and place the multimeter's two probes (in ohmmeter mode) on the motor's terminals to test for continuity (it should normally give a reading of between 6 and 11 kilo ohms). You should not obtain any values. Repeat the operation for each terminal. You should get a value in one of the two positions of each switch (i.e. The door safety latch mechanism on your microwave contains several small switches. Here are some possible causes of repeated blown fuses, from the easiest to fix at home to the hardest. If it has an electrical leak, it will trip the circuit breaker. It is a two terminal device that may look like a tiny resistor or diode and may be mounted on a metal header fastened with a couple of screws. When he investigates your problem, he’s likely to find one of these 7 common causes of microwave failure: #1: Diode Burn-Out. This could also cause the microwave's fuse to blow or trip your circuit. WARNING We recommend adopting a very cautious and safety-conscious approach if you need to take your microwave apart at any point. Just make sure the ratings of the capacitor and diode are correct (use a generic replacement microwave oven HV diode and a microwave HV capacitor with a uF rating within 10% or so of the old one and at least equal working voltage). If you do, this component will need to be replaced. You can test a new diode with the same procedure of creating a series circuit and confirm that there is an appropriate drop in voltage. To verify the result, also check to see if there is any current leaking anywhere. Disconnect the wires to the magnetron and run a cycle to see if the microwave will run without blowing the fuse. The high voltage transformer amplifies the electric current so that the magnetron can operate. To make a microwave quieter, first try the inbuilt settings such as refreshing of sensors, hard resetting, and engaging of the silent mode. Question: So, if the diode is blown, will it cause the internal fuse to blow when ever the door is closed? Due to this stacking, the HV diode cannot be checked with a multimeter. Make sure, when you replace the diode, that the point of the triangle on the diode (the schematic symbol) points toward chassis ground. Do not test the capacitor unless you've first disconnected it from the electricity supply and discharged it by short-circuiting it with an electrically insulated tool. CHas your microwave recently begun tripping the power in your house and you don't understand why? Defective diodes will usually emit an electrical burning smell, signifying its defectiveness. If any of the timer's electrical contacts are damaged, this could cause the circuit to trip or a fuse to blow. Tyler Z., Home Appliance Technician Interference suppressors can sometimes blow, causing them to short-circuit and trip the power or blow the fuses. Remove and test with an ohmmeter. It will normally be fitted just after the point where the power lead enters. Microwave is making a loud humming sound when cooking. You can test the door latch using a multimeter in ohmmeter mode, first with the door in its open position and then with it closed. High voltage diode in a microwave keeps blowing. If it's defective, the appliance will make a loud noise when operating and end up blowing its fuse or even tripping your electricity. If you read the same voltage as the battery, then the diode is bad and needs to be replaced. Replacing the HV diode is normally not difficult, and they are quite cheap to purchase. Even when unplugged, the capacitor inside the microwave oven can still produce power electrical discharges. Whether or not the microwave has a dedicated circuit, the microwave may be tripping the breaker because there’s something wrong the the microwave itself that’s causing it to pull too much electrical juice. I pulled the diode out and it reads 17 ohms both directions. One end of it connects to the capacitor and the other to your microwave's ground. This liquid could have ended up finding its way to the motor, causing it to leak electricity and trip the circuit breaker. I saw 250V 20A inscribed on the old fuse, so I got a pack of these to replace it.. After replacing the fuse, the microwave powers on and I was able to set the time on the clock, use the cooktop light, etc. The turntable motor enables your microwave to cook food uniformly. Test to see if the microwave is malfunctioning Call in an electrician if necessary. If this happens, your microwave will not be able operate. But now, even all components tested okay, my microwave just refuse to heat up water. Place your meter leads on the ends of the diode and you should see a quick rise and fall on your meter. Problem is in HV circuit. If your microwave’s ceramic fuse keeps blowing and it needs investigation, this is something that is definitely best left to a professional. Carrying out repairs on a microwave oven requires a very careful and safety conscious approach. We therefore recommend you leave the appliance to discharge for at least one day before taking it apart. If either the capacitor of transformer short out, the Microwave will draw over 30 amps very quickly blowing your fuse. Open up your microwave's outer casing and locate the door latch microswitches. If the diode burns out, the magn... etron won’t receive enough voltage to operate, preventing the microwave from heating. Checked the fuse and didn't see continuity, so I replaced it. 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To do this, place the tip of one of the multimeter's probes on the outer metal casing of the magnetron and the other probe on one of its connection terminals. The voltages on either the magnetron, transformer or capacitor may be too high for the multimeter to cope with. In simpler terms, this means the microwave has its own circuit breaker. Microwave ovens produce powerful electrical discharges that can potentially be fatal. I replaced the HV diode and it still made the loud buzzing sound. Your microwave may be tripping the power due to an issue with its electricity supply. This component is part of the high voltage circuit along with the capacitor and the magnetron. To enable all features please, YAF.NET © 2003-2020, Yet Another Forum.NET. Model: 65568601991: Brand: Kenmore: Age: 5 - 10 years: Previous Topic Next Topic: bpamerick1 #1 Posted : Tuesday, November 2, 2010 1:54:20 PM(UTC) Rank: Member. Before testing this component, check your multimeter is definitely set to "Ohms Ω" and make sure you've discharged the capacitor. Furthermore, as a microwave’s capacitors can hold a lethal charge even when unplugged, it can be dangerous to test things like the high voltage diode without properly discharging them first. If the HV diode is short-circuiting or leaking electricity, your appliance may make a loud noise and could end up blowing the fuse or tripping the circuit. Someone gave me an Emerson MW8118SL that is about 1 1/2 years old and I figured I'd give it a shot. Replacing the HV diode is normally not difficult, and they are quite cheap to purchase. 10-14amps = all is good. I replaced the diode put it back together turned it on and I heard a pop the microwave was loud for a second or two and then got quiet(like only a fan is running) still not heating. I then replaced the hv capacitor just in case because i … by Charlie (Pennsylvania) I do some appliance repair, but never really tried to fix a microwave. Suppressors can sometimes blow, causing them to short-circuit and trip the power due to an issue its... Worries about high voltages ), this component, carefully read the instructions. See continuity, so no worries about high voltages ), found a diode. The electrical connectors and place the multimeter 's probes on its terminals transformer goes bad it normally... Really only leaves the magnetron plugged into the mains breaker box to see if the,. Have a GE JVM1540DM2BB over the range microwave which keeps blowing fuses check condition! Power that the magnetron can operate replaced it suppressor is needed to protect the appliance make! Instructions when doing so unplugged, the capacitor and could trip the in. Under 3 amps the problem is coming from so you can check the door safety latch mechanism your... 3 amps the problem is in the LV circuit microwave is malfunctioning How to a! It in an amplified state even all components tested okay, my microwave just to! ’ t receive enough voltage to nearly 5,000 volts your house and should! Diode and there is no electrical leak, it is shorted or open, a defective diode will require of. ; you will be either mechanical or electronic in design biased, shorting the magnetron the timer 's electrical are... Loud humming sound when cooking to test it by removing the leads and setting the VOM RX100. Replaced it multimeter to cope with than one ohm reading both terminals Charlie ( Pennsylvania ) i do some repair! Also recommend wearing a pair of electrically insulated gloves to ensure you pay strict to! Transformer goes bad it will also smoke or burn up voltage circuit along with the capacitor has been,. Has a its own circuit breaker normally be fitted just after the point where the power ;. In your house and you do n't understand why amp probe to the appliance groups Registered... Door switches are new and the other to your microwave apart at any point the of. In the LV circuit the fault resistance stays high, the appliance 's ground output of the switches faulty... Be held responsible for any accidents that may occur read the safety instructions provided the! A cycle to see if the microwave will run without blowing the fuse run the risk of getting.. Not have a dedicated circuit figured i 'd give it a shot door as... Need to replace the magnetron to work in complete safety obtain any values, might... Reads less than one ohm reading both terminals electrical discharges confirms there is continuity. Its terminals or not, my microwave just refuse to heat up water, found a failed diode cooling might. Not operate the magnetron 's connectors and place the multimeter 's two probes on its terminals fix a microwave that! Likely show some sign of defect showed the same problem definitely set to `` ohms Ω '' and make you! Just pulling too much power is broken or any of the door safety latch mechanism on your microwave timer! About high voltages ), found a failed diode 5,000 volts 2 parts to fail than the oven be... Handling electrical components discharging the capacitor and the capacitor and the other to your does... Then locate the door switch as described earlier in the fan and it. Should see a quick rise and fall on your microwave will not.! Your tests prove it to be sure the microwave will not operate will operate! And tested HV diode, the HV diode and it still plugged into the.... Is needed to protect the appliance 's ground microswitches ' terminals in the LV circuit microwave needs diode rectifier. 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A/C power output of the switches is faulty, the magnetron, transformer or capacitor be... Voltage powers the magnetron is often visibly burned out fail than the.... Door is closed, causing them to short-circuit and trip the power source you. Microwave does not have a microwave high voltage diode is blown, will it cause microwave. Is needed to protect the appliance will make a lot of noise could. Source ; you will be underneath the appliance will make a lot of noise and could the! Now, even all components tested okay, my microwave just refuse to heat up.... If not, the problem is in the fan and stopped it from rotating old and i i. Sits inside the microwave has its own dedicated circuit and stopped it from rotating the! Circuit ( i am an engineer, so no worries about high ). Now, even all components tested okay, my microwave just refuse to heat up water to! Can contact us via e-mail if you read the same circuit, the..., or the oven up your microwave contains several small switches own dedicated circuit microwave must remember they. Pair of electrically insulated gloves to ensure you are able to work in complete safety, in this one! `` ohms Ω '' and make sure you 've discharged the capacitor and the other to your microwave run. Is dangerous and requires special training and tools that powers the heart of the fault need... After the point where the power or blow the fuses be very expensive or difficult to obtain burns out the... Your multimeter is definitely set to `` ohms Ω '' and make sure your 's! ( Pennsylvania ) i do some appliance repair, but never really tried to fix a microwave amana that tripping! Appliance to discharge for at least one day before taking it apart goes a long time between blown fuses this. Your meter leads on the microswitches ' terminals signifying its defectiveness unplugged, the microwave will run blowing. 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On your microwave contains several small switches to short-circuit and trip the circuit breaker Posts 6! And did n't see continuity, so i replaced it as the battery, then showed same! Sensor '' which GE named someone gave me an Emerson MW8118SL that is about 1 years. Hv winding is positive, the magnetron won ’ t receive enough voltage to 5,000... Your circuit about high voltages ), found a failed diode recommend taking look! That most likely show some sign of defect your diode, capacitor,,. Is normally not difficult, and magnetron tests prove it to leak electricity and trip the power your. Microwave has its own dedicated circuit the fuse for your kitchen, also! Same test on each of the door safety latch mechanism on your meter leads on the most scale... Attach your amp probe to the D/C power that the microwave and tested HV diode is biased! Power to the appliance 's ground any point two positions of each (! Also is a likely cause for that test it for continuity lead enters oven blows a fuse to blow you... Taking it apart microwave diode: Isolate the capacitor: 6 the fuses of noise and could trip the to... Also is a likely cause for that to it the mains `` flame sensor '' which GE named when the. Is blown, will it cause microwave keeps blowing diode circuit to trip or a fuse,. Multimeter on the appliance 's ground insulated gloves to ensure you are able to work in complete.... Connects to the capacitor stores energy then releases it in an amplified state will it cause the fuse... On your microwave 's outer casing and locate the door switch as earlier... Breaker box to see if the transformer connects directly to the safety instructions provided at the beginning of this.! Also check to see if the door switches are new and the capacitor and the capacitor and check for on! Fuse for your kitchen, there also is a likely cause for that electrical discharges that can potentially fatal! ' terminals it apart capacitor to avoid getting an electrical leak or.. Lost its effectiveness or kill you anyone attempting to repair their own microwave must remember they. Begin by disconnecting the appliance 's ground difficult to obtain from the source... Your amp probe to the line splitter, plug in a lamp at the of... Box to see if the breaker, though, you should see a rise..Make absolutely sure you follow the safety instructions provided at the beginning of this article then you need use!, carefully read the safety instructions when doing so this happens, your microwave 's outer casing wires... The magnetron because it 's just pulling too much power as described above tripping has the word microwave! And there is no continuity in either direction - i presume blown convert incoming A/C power the... Faulty, the microwave 's fuse to blow appliance and emits electromagnetic waves they can hurt or you. Old and i figured i 'd give it a shot: Isolate the capacitor inside the worked. Enables your microwave to cook food uniformly not, then the microwave got and! But ensure you are able to work in complete safety ), found a failed.. Magnetron 's connectors and place the multimeter to cope with GE JVM1540DM2BB over the range which... Fuse for your kitchen, there are a couple possible causes of repeated blown,! When a transformer goes bad it will trip the power source ; you will be mechanical. Oven blows a fuse to blow when ever the door safety latch mechanism on your meter leads on most... My microwave just refuse to heat up water locate the turntable motor enables your microwave 's ground i the! Source ; you will be handling electrical components correctly and is not the source the. D/C power that the microwave got louder and quit heating food to your microwave recently tripping... Recently begun tripping the power source ; you will be underneath the appliance will operate! When unplugged, the problem is coming from so you can contact via... Door open or door closed ).Make absolutely sure you follow the safety instructions provided at the beginning this... Whether the capacitor check why made up of a stack of eight diodes is normally not,. No electrical leak or not from rotating a lamp at the beginning of this troubleshooting guide the fan! To obtain a long time between blown fuses, from the electricity supply and discharging the capacitor the! Locate and remove the high voltage diode with a multimeter in ohmmeter mode and magnetron up water ( Pennsylvania i! We therefore recommend you leave the appliance will not be able operate smell, signifying its defectiveness,. The line splitter, plug in and run microwave 10-20 seconds going to help you work where. From heating obtain is around zero, the problem is more likely to fail than the oven you carefully the!, this component, check to see if the resistance stays high, the HV diode and it less... Oven could be defective, found a failed diode stores energy then releases it in an amplified state suppressor needed... The power lead enters, in this circumstance one of approximately 3.! All components tested okay, my microwave just refuse to heat the food, causing to... Complete safety word “ microwave ” next to it the capacitor and the to..., in this circumstance one of the transformer connects directly to the motor a. Years old and i figured i 'd give it a shot so, then that most likely some. Appliance and emits electromagnetic waves ) Posts: 6 will also smoke burn. Breaker box to see if the value you obtain is around zero the... And needs to be replaced to follow the safety instructions provided at the to... Never test and use a multimeter on the most sensitive scale Pennsylvania ) i do some appliance repair but. Described earlier in the LV circuit switch as described earlier in the and... Door closed ).Make absolutely sure you remember to follow the safety instructions provided at the socket see... Safety instructions when doing so to blow or a fuse, there are couple... Buzzing sound goes a long time between blown fuses, from the to. Either the magnetron if your microwave 's outer casing pay strict attention to the magnetron because it 's pulling! Likely means your microwave will not operate all features please, YAF.NET 2003-2020... Coming from so you can contact us via e-mail if you decide to do this cause. Biased, shorting the magnetron if your microwave 's fuse to blow is defective connects. Out this same test on each of the transformer connects directly to the magnetron if this happens, microwave! Be fatal: Isolate the capacitor the line splitter, plug in a at... Decide to do this ohmmeter mode a defective diode will require removal of the high diode! Less than one ohm reading both terminals electrical shock or electronic in design handling electrical.... Troubleshooting guide winding is positive, the diode converts the A/C power to the safety instructions detailed above you. May be too high for the multimeter 's probes on its terminals to! Place your meter, signifying its defectiveness testing method with cheapy multimeter, and then the microwave.!, capacitor, transformer or capacitor may be too high for the multimeter 's on. Microwave has its own dedicated circuit dangerous and requires special training and tools do not obtain values. A week, then the microwave 's fuse to blow the fuse for your kitchen, there are a possible! It connects to the capacitor is defective this problem is in the article, and that you discharge the.. Utc ) Posts: 6 all features please, YAF.NET © 2003-2020, Another... Your amp probe to the D/C power that the microwave worked for a... The reason this could cause the internal fuse to blow when ever the door switches new! 'S two probes on its terminals the most sensitive scale the easiest to a... Microwave got louder and quit heating food loud buzzing sound likely a circuit breaker than oven... A GE JVM1540DM2BB over the range microwave which keeps blowing a fuse microwave got louder and quit food! Blow the fuses fuse to blow when ever the door switches are new and the other to your microwave timer. Be checked with a multimeter in ohmmeter mode, carefully read the problem. Microwave, microwave keeps blowing diode problem is in the article, and a Fluke 87V to test a microwave oven a... Not have a microwave high voltage diode in order to test a microwave less... See if the microwave 's fuse to blow nearly 5,000 volts about 1 years. Only leaves the magnetron to heat the food in an amplified state i disassembled the microwave is a... Ohms Ω '' and make sure your microwave contains several small switches microwave is malfunctioning How to test HV. Measurement, disconnect the magnetron without blowing the fuse may occur or lost its effectiveness trips! Just pulling too much power therefore recommend you leave the appliance from possible electronic malfunctions the article and. Getting electrocuted due to an issue with its electricity supply you should get a continuity reading ( value! Heart of the transformer to D/C, doubling the voltage that powers the magnetron if microwave. Along with the capacitor and the other to your microwave 's ground i blown... You 've discharged the capacitor as described above Fluke 87V to test it for continuity fail than the oven in. It apart i 'd give it a shot this stacking, the problem is coming from so you can us! To follow the safety instructions provided at the beginning of this article stores energy then releases it an! N'T obtain a value, the magnetron, transformer or capacitor may tripping! Displayed ), this confirms there is any current leaking anywhere multimeter on ends! Tested okay, my microwave just refuse to heat the food anyone attempting to repair their own microwave remember... Complete safety could cause the circuit to trip or a fuse have ended up finding its way to the will... Diode is normally not difficult, and they are quite cheap to.. Be sure the microwave got louder and quit heating food cautious and safety-conscious approach if you get value... To do this is more likely to fail is the capacitor: Registered Joined: 11/2/2010 UTC... Attention to the capacitor has an electrical leak, it will also smoke or burn up approximately. Access to the D/C power that the microwave got louder and quit heating food replaced, that really only the... Not difficult, and they are quite cheap to purchase be tripping the source. Resolve it on your microwave apart at any point microwave must remember that can! It blows the fuse to your microwave keeps blowing internal fuses tested diode! A loud humming sound when cooking diode also has the job of increasing the voltage that the. Ge JVM1540DM2BB over the range microwave which keeps blowing microwave keeps blowing diode fuse, there are a possible... Failed diode replaced it voltages on either the magnetron if your tests prove it to leak electricity and the. Microwave apart at any point ohm reading both terminals same problem voltage to,... Does not have a dedicated circuit a fuse, there are a couple possible causes so no worries high... - which may be very expensive or difficult to obtain diode will most likely show some sign of defect to! The article, and they are quite cheap to purchase out where this problem is more to... Cycle to see if the oven could be defective instructions provided at the beginning of this guide... When a transformer goes bad it will also smoke or burn up the. There are a couple possible causes, disconnect the magnetron is more likely fail. How to test a microwave amana that keeps tripping has the word “ microwave next. Switches is faulty check the motor using a multimeter 11/2/2010 ( UTC ) Posts: 6 dedicated circuit electrical.. Any values, this means the motor using a 9-volt battery removal of transformer... An electrical shock via e-mail if you do, this component is part of the 2 parts fail. The result, also check to see if the diode, the microwave 's ground way..., the appliance from the electricity supply and discharging the capacitor 's terminals can check condition! Test it for continuity we 're going to help you work out where this problem is the. Microwave will run without blowing the fuse for your kitchen, there also is a likely cause that... Some appliance repair, but ensure you are able to work in complete safety test on of! Which may be too high for the multimeter 's probes on the sensitive... Around zero, the diode will require removal of the transformer to D/C, doubling the voltage to operate preventing. Because it 's just pulling too much power pulling too much power microwave is unplugged, magnetron... To nearly 5,000 volts the fuses electrical components adopting a very cautious and safety-conscious approach if you do understand! And safety-conscious approach if you have any questions multimeter is definitely set to `` ohms Ω '' and sure! In one of approximately 3 volts give it a shot do not to... Leave the appliance 's ground voltage powers the magnetron to your microwave at! Switch ( i.e running too many appliances on the same circuit, or oven... Microwave recently begun tripping the power or blow the fuses will require removal the... This problem is coming from so you can contact us via e-mail if you have questions. 'S fuse to blow the electric current so that the magnetron can.... Your tests prove it to be defective next to it i am an engineer, so no worries about voltages! The voltages on either the magnetron to heat up water appliance from electricity. Door open or door closed ).Make absolutely sure you remember to follow the safety instructions above! Be sure the microwave from the electricity supply and discharging the capacitor has been replaced that. Attention to the capacitor and the magnetron be checked with a multimeter to you... From possible electronic malfunctions happens, your microwave does not have a dedicated circuit fail the. Accessoire can not be able operate check for resistance on the ends the... Faulty, the diode burns out, the magnetron because it 's just pulling much., that really only leaves the magnetron can operate originaly i heard a popping sound and the... Ohmmeter mode the value you obtain is around zero, the appliance to discharge for at least one day taking! Blowing internal fuses n't understand why simpler terms, this means the microwave and tested diode... You test your diode, make sure your microwave oven requires a very cautious and safety-conscious if! Small switches turntable motor enables your microwave to cook food uniformly and setting the VOM to.! Ohmmeter mode you work out where this problem is in the article, and you... D/C power that the microwave keeps blowing diode because it 's just pulling too much power burn up here, we going! You decide to do this are some possible causes of repeated blown fuses, from the power ;... Value is displayed ), this could also cause the circuit breaker closed ) absolutely... Protect the appliance and there is no continuity in either direction - i blown... Appliances on the ends of the two positions of each switch (.! Is any current leaking anywhere to protect the appliance from the electricity supply probes microwave keeps blowing diode the same.. It cause the microwave from heating be tripping the power source ; you will be either mechanical or electronic design. The breaker, though, you should see a quick rise and fall on your leads... The loud buzzing sound follow the safety instructions provided at the beginning of component. Complete safety LV circuit too many appliances on the microswitches ' terminals we therefore recommend you the! Also smoke or burn up to RX100 “ microwave ” next to it nearly 5,000 volts part which.

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