How to test a microwave’s magnetron

How to test a microwave's magnetron

.Virtually all of the kitchens on the earth have one equipment in frequent nowadays and that’s the microwave. Microwaves are used to cook dinner and warmth meals and liquids and is extensively used. Due to its fixed utilization, there’s excessive chance of it getting consumer used and therefore barely malfunctioned. One factor that may presumably go improper is the magnetron. A magnetron will be thought of as the center of the microwave because it produces RF vitality which is radiated into cooking cavity the place meals absorbs it. If you want to test it for its optimum efficiency, then there are a number of methods to do it. The next will let you know how to test microwave’s magnetron:

How to test a microwave's magnetron

Picture Credit: Wikipedia

1. Technique 1

On this technique, you’ll first want to unplug the microwave oven from the principle energy provide and discharge all of the excessive voltage capacitors. Now you have to to very rigorously take away the leads from the terminals of the magnetron. Keep in mind to make notes of the wire places as correct wiring is extraordinarily essential for the system’s appropriate working. Now take an ohmmeter and set it to its lowest resistance scale. Now measure the resistance from one magnetron terminal to the opposite in any of the instructions. The filament resistance of the magnetron must be lower than an ohm for its correct working.

2. Technique 2

There’s one other technique to test a microwave’s magnetron. On this technique, you once more want to unplug the system from the principle energy provide. Set the meter to its highest resistance scale and verify from the terminals of the magnetron to the steel magnetron housing. Now by doing so the meter ought to learn infinite, whatever the polarity of the meter. Even a little little bit of studying will likely be a sign that the magnetron is flawed.

Keep in mind that testing a magnetron should not be performed if you’re a layman who hasn’t tried something like this earlier than or haven’t any expertise of wires, wiring and digital equipment restore work. That is so as a result of doing so can show harmful. If something is just not performed appropriate, it might probably harm your equipment and show dangerous in your security. There isn’t a dearth of fine technicians and electricians on the market who will be referred to as if you’re dealing with any problem together with your microwave.

The magnetron makes use of everlasting magnets and likewise a half wave voltage doubler circuit. This oscillates and produces 2450 MHz cooking frequency. It thus converts the 60Hz provide voltage into usable microwave vitality. It will be significant to be abreast with such information earlier than to try to restore the magnetron or some other a part of the microwave. In case your microwave doesn’t warmth, then this might be associated to a faulty magnetron and you need to both verify this by your self by following the steps given above or contact a skilled at Mr Proper.

If you need to Do It Your self, we’ve some really helpful instruments and gear for you:-

You thought you’ll have a quiet night time at dwelling, however when heating up some leftovers, your microwave oven begins buzzing, crackling, or popping loud sufficient to drown out the graceful jazz coming from the Bluetooth speaker sitting in your kitchen counter. What’s inflicting that horrible sound? Is it even secure to use the microwave if it’s emitting such a loud noise?

Most typical causes for noisy microwave ovens

The kind of noise your microwave oven is making will be a robust indicator for which half could also be defective or sporting out. These are the commonest elements answerable for a noisy microwave:

  • Magnetron – The microwave magnetron makes use of high-voltage to create the microwave frequency that cooks the meals positioned within the oven cavity. In good situation, the magnetron will emit a low hum throughout operation. Nonetheless, if the magnetron is broken or practically burned out, it could start emitting high-pitched sounds or growling noises.
  • Diode – The diode works at the side of a capacitor to energy the magnetron. A faulty microwave diode might be the actual offender behind a noisy magnetron.
  • Turntable Motor – One of many few transferring elements within the microwave, the turntable motor rotates the equipment’s glass tray so the meals or beverage is heated evenly. Over time, the motor bearings can put on out which might create a grinding or screeching sound when the motor tries to function. You possibly can typically uninstall the motor by first eradicating the microwave’s backside panel then unthreading the motor mounting screw or screws and detaching the facility wires. With the motor in your hand, attempt turning the motor shaft. Is it sticking or troublesome to rotate? Then the motor is probably going faulty and can want to get replaced with a new one.
  • Exhaust or Cooling Fan Motor – A cooling fan motor or exhaust fan motor (normally present in microwaves mounted over a vary to drive a blower wheel to draw steam and smoke generated by the vary’s cooktop by means of a charcoal filter again into the kitchen or to the skin of the house by means of a vent), can put on out in the identical method a turntable motor can. It’s best to take away the fan motor from the equipment and take a look at rotating the fan blades or blower wheel by hand. If the blades or wheel don’t flip freely, you realize the motor has seized and can want to get replaced.
  • Blower Wheel/Fan Blades – For those who’re listening to a scraping sound after urgent the beginning button in your microwave, it’s doubtless the blower wheel or fan blades have turn into partially dislodged from the fan motor shaft and are rubbing in opposition to the fan housing. You possibly can attempt reseating the wheel or blades, however chances are you’ll want to change the element with a new one.

Utilizing a multimeter to test microwave elements

The magnetron and diode will be examined with a multimeter to decide if the elements have continuity – a steady electrical path current within the elements. Earlier than you try to disassemble the microwave to attain the magnetron, diode, or some other element for testing or alternative, unplug the facility twine. Since excessive voltage capacitors utilized in microwaves might retain a cost even after the facility twine has been unplugged, it is strongly recommended to discharge the capacitor instantly after eradicating the duvet. You are able to do this by inserting a screwdriver blade throughout every set of capacitor terminals (keep away from touching the blade when doing this).

Right here’s how you should utilize a multimeter to test a magnetron for continuity:

  • Rotate the multimeter dial to the bottom setting for “Ohms of resistance”.
  • Contact the black lead to one of many magnetron’s terminals and the crimson lead to the opposite terminal. The meter show ought to present lower than one Ohm for the magnetron to be working correctly.

To test a diode for continuity, you have to a meter powered by a 9-volt battery or use a 9-volt battery at the side of the meter. For the latter:

  • Holding the black lead in opposition to one finish of the diode, contact the other finish of the diode to the destructive terminal on the 9-volt battery. Contact the crimson lead to the constructive terminal on the battery. Take into account, the diode ought to solely have continuity in a single course, so if the multimeter show exhibits no continuity, attempt reversing the diode so the black lead is in touch with the other finish of the diode when contact the opposite finish of the diode to the 9-volt terminal. If the diode exams destructive for continuity in each instructions or has continuity in each instructions when the leads are reversed, the diode has failed and can want to get replaced.

Watch out for microwave oven arcing

For those who hear a crackling sound throughout operation, it is best to observe the oven cavity for arcing: sparks or flashes typically occurring close to rack helps. Arcing will be brought on by a soiled wave information or the uncovered steel of a broken inside wall. Whereas a free blower wheel or defective diode won’t essentially pose any imminent hazard when working a microwave, arcing can harm the oven and the cookware so it is best to instantly shut off the equipment and keep away from utilizing it till the issue is fastened. A brand new wave information will be bought if vital or, if the wall is chipped, you should buy particular microwave paint to cowl the uncovered steel.

All the time put security first when trying a microwave restore

Due to the excessive voltage and excessive present utilized by microwave ovens, remember that repairing this equipment poses a substantial threat for harm or demise if precautions aren’t taken. It’s best to at all times unplug the microwave earlier than you try any disassembly. Since excessive voltage capacitors utilized in microwaves might retain a cost even after the microwave has been unplugged, we suggest that solely skilled professionals entry and change inner elements.

Discover the best microwave oven elements with Restore Clinic

Replacements for these elements that may trigger your microwave oven to turn into noisy, like a magnetron, diode, turntable motor, fan motor, fan blade, blower wheel, or wave information will be discovered at Restore Clinic. All you might have to do is enter the total mannequin variety of your microwave within the Restore Clinic web site search bar to see a full checklist of appropriate elements. The half class and half title filters permit you to simply refine that checklist to discover the precise half you want. Whereas Restore Clinic shares equipment elements that match microwaves from high manufacturers like GE, Samsung, Whirlpool, LG, Kenmore, Frigidaire, and Panasonic, you’ll need to be sure you’re deciding on a half that’s immediately related together with your particular microwave oven mannequin.

Equipment Categorical August 30, 2017 Microwave Restore Go away a Remark

Generally microwaves don’t break down fully as a results of a blown fuse or a busted transformer. As a substitute, generally your microwave can stick with it the passive capabilities of lighting up, telling time, and even rotating the turntable inside with out really heating up your meals. In these circumstances, one thing is interfering together with your microwaves capability to totally make the most of its energy.

When you’ve got a Frigidaire Gallery FGMV174KFB (2012), you may test the performance of every of those elements with a multimeter. There are three elements of your microwave that deal primarily with the excessive voltage facet of issues and join to your inline fuse: the capacitor, the transformer, and the magnetron. You possibly can test the rectifiers, or diodes, of your magnetron, that are answerable for changing electrical energy from AC to DC.

You possibly can test every of the three elements of your damaged microwave within the order that’s most handy to you and you are feeling the most secure doing; capacitors and diodes are the commonest causes of issues, and also you need to make certain you’re dealing with {the electrical} elements safely.

WARNING: DO NOT ATTEMPT WITHOUT EXPERIENCE IN APPLIANCE REPAIR. BE SURE TO UNPLUG MICROWAVE AND DISCHARGE CAPACITOR BEFORE WORKING ON ANY ELECTRICAL COMPONENT.

The Process for Testing the Diode, or Rectifier, of Your Magnetron:

Get a nine-volt battery and insert the readers of your voltmeter as a commonplace. Then use gator clips to put the diode in a sequence circuit with the battery to test the voltage. A diode or rectifier ought to trigger a voltage drop, on this circumstance one in every of roughly Three volts. For those who learn the identical voltage because the battery, then the diode is dangerous and desires to get replaced.

You possibly can test a new diode with the identical process of making a sequence circuit and make sure that there’s an acceptable drop in voltage. Rectifiers can fail, so it’s a frequent reason behind microwave and equipment malfunction.

Putting in Your New Diode: 5304467670

Make certain the cathode facet is on the bottom and the anode facet is on the capacitor. It’s extraordinarily essential to join the diode within the appropriate course to guarantee a secure, functioning connection. The destructive facet of your rectifier will sometimes have a band across the nearest fringe of the of the center element so as to denote which facet it’s on; it can even have a floor connector, which seems like a circle on the tip of the wire. The constructive facet received’t have a band and can have a bit that goes to the capacitor. The destructive facet is the cathode facet, and the constructive facet is the anode facet. Be sure you hold these totally different sides straight!

Different Potential Electrical Issues with Your Microwave:

In case your diode is working and doesn’t want to get replaced, the subsequent greatest element to test is your capacitor, after which the high-voltage facet of your transformer. Transformers will be a little tough to test as a result of the high-voltage facet will be damaged whereas the low-voltage terminals are completely operational. On this half, search for blackened items or indicators of smoke. The high-voltage winding to floor connection must also have a resistance of zero ohms, and if it doesn’t you’ve discovered your damaged element.

As at all times once you taking aside and changing elements in {an electrical} equipment, take care to reattach the elements precisely as you discovered them and to use insulated instruments. If you can be engaged on or close to the microwave’s capacitor, take the additional step of manually discharging it as a substitute of hoping the voltage will dissipate if you happen to wait ten to thirty minutes. And if you would like to be taught extra about repairing your personal microwave and main home equipment, try Equipment Categorical for extra articles and product-specific tutorials.

The standard magnetron tube has a mean lifetime of 2,000 hours of operation. Meaning try to be in a position to cook dinner and warmth meals in a typical microwave oven for 2,000 hours earlier than then oven loses energy.

Equally, are microwaves price repairing? Restore or Substitute Microwave A alternative equipment prices about $100 and will work for not less than seven to 10 years. In case your microwave is comparatively new and the restore prices lower than changing it, the repair is price it. Typically, the issues price fixing embody: No gentle when the door opens or whereas cooking.

Thereof, what causes a magnetron to fail in a microwave?

Causes a Magnetron to Fail in a Microwave

  • Magnets Cracking. This trigger occurs when the harm happens to the magnets of the magnetron, this end in lowering the magnetic discipline.
  • Burned out terminals.
  • Burned Antenna/Dome.
  • Free Connection of Magnetron.
  • Resistance Continuity.
  • Arc-over internally.

When ought to Microwave get replaced?

Delish states that a microwave usually lasts for 10 years earlier than needing to be changed. Subsequently, in case your microwave is older than 10 years outdated, it most probably wants changing.

This test is mostly made solely when a buyer complains that the meals seems to be under-cooked or takes a very long time to cook dinner completely.

There have been a variety of makes an attempt to rapidly decide if the oven is performing to its specified energy. Nonetheless, the best and maybe essentially the most dependable contain heating a recognized quantity of water for a specified time, and noting the temperature change following the heating course of.

There two preparations for one of these test; JIS and IEC705.

The JIS system was initially offered for ovens manufactured up to 1990, whereas the IEC705 association was established for ovens manufactured after 1990.

The IEC705 association is aimed extra at a laboratory surroundings the place mains voltage and ambient situations are managed.

This test is designed to present a information to the overall effectivity of the heating system and to point out gross lack of energy output. It’s not a laboratory test and as such has a extensive toleerance by way of outcomes

2 x 500ml plastic beakers
1 x Correct thermometer
1 x Flat stirrer

  1. Fill every beaker with 500ml of water at 20 C° +/- 5 C°
  2. Verify the exact temperature of every and if there’s a distinction discover the typical by including the 2 values collectively and dividing the end result by 2.
  3. Place the beakers within the centre of the cooking space and set the oven to full energy and change on. Permit the oven to function for exactly 60 seconds, permitting 2 seconds for the magnetron to attain working temperature.
  4. Take away the beakers from the oven and stir every beaker instantly earlier than taking the temperature of every, repeating step 2.
  5. Subtract the typical beginning temperature from the typical remaining temperature and multiply the end result by 70 to give the worth representing the oven energy in Watts (JIS)

Beginning temperature: (19.3 + 19.9) /2 = 19.6 C°
Closing temperature: (27.1 + 30.5) /2 = 28.Eight C°
Distinction: 28.8 – 19.6 = 9.2 C°
Energy output: 9.2 x 70 = 644 Watts JIS

IEC705

  1. Proceed as for JIS test, however with water at 10 C° +/- 2 C°
  2. On reaching step 5, multiply the distinction between the averaged values by 71.15 to give the facility output in Watts IEC705

Beginning temperature: (8.8 + 11.0) /2 = 9.9 C°
Closing temperature: (19 + 20) /2 = 19.5 C°
Distinction: 19.5 – 9.9 = 9.6 C°
Energy output: 9.6 x 71.15 = 683.04 Watts IEC

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Equipment Categorical August 30, 2017 Microwave Restore Go away a Remark

Generally microwaves don’t break down fully as a results of a blown fuse or a busted transformer. As a substitute, generally your microwave can stick with it the passive capabilities of lighting up, telling time, and even rotating the turntable inside with out really heating up your meals. In these circumstances, one thing is interfering together with your microwaves capability to totally make the most of its energy.

When you’ve got a Frigidaire Gallery FGMV174KFB (2012), you may test the performance of every of those elements with a multimeter. There are three elements of your microwave that deal primarily with the excessive voltage facet of issues and join to your inline fuse: the capacitor, the transformer, and the magnetron. You possibly can test the rectifiers, or diodes, of your magnetron, that are answerable for changing electrical energy from AC to DC.

You possibly can test every of the three elements of your damaged microwave within the order that’s most handy to you and you are feeling the most secure doing; capacitors and diodes are the commonest causes of issues, and also you need to make certain you’re dealing with {the electrical} elements safely.

WARNING: DO NOT ATTEMPT WITHOUT EXPERIENCE IN APPLIANCE REPAIR. BE SURE TO UNPLUG MICROWAVE AND DISCHARGE CAPACITOR BEFORE WORKING ON ANY ELECTRICAL COMPONENT.

The Process for Testing the Diode, or Rectifier, of Your Magnetron:

Get a nine-volt battery and insert the readers of your voltmeter as a commonplace. Then use gator clips to put the diode in a sequence circuit with the battery to test the voltage. A diode or rectifier ought to trigger a voltage drop, on this circumstance one in every of roughly Three volts. For those who learn the identical voltage because the battery, then the diode is dangerous and desires to get replaced.

You possibly can test a new diode with the identical process of making a sequence circuit and make sure that there’s an acceptable drop in voltage. Rectifiers can fail, so it’s a frequent reason behind microwave and equipment malfunction.

Putting in Your New Diode: 5304467670

Make certain the cathode facet is on the bottom and the anode facet is on the capacitor. It’s extraordinarily essential to join the diode within the appropriate course to guarantee a secure, functioning connection. The destructive facet of your rectifier will sometimes have a band across the nearest fringe of the of the center element so as to denote which facet it’s on; it can even have a floor connector, which seems like a circle on the tip of the wire. The constructive facet received’t have a band and can have a bit that goes to the capacitor. The destructive facet is the cathode facet, and the constructive facet is the anode facet. Be sure you hold these totally different sides straight!

Different Potential Electrical Issues with Your Microwave:

In case your diode is working and doesn’t want to get replaced, the subsequent greatest element to test is your capacitor, after which the high-voltage facet of your transformer. Transformers will be a little tough to test as a result of the high-voltage facet will be damaged whereas the low-voltage terminals are completely operational. On this half, search for blackened items or indicators of smoke. The high-voltage winding to floor connection must also have a resistance of zero ohms, and if it doesn’t you’ve discovered your damaged element.

As at all times once you taking aside and changing elements in {an electrical} equipment, take care to reattach the elements precisely as you discovered them and to use insulated instruments. If you can be engaged on or close to the microwave’s capacitor, take the additional step of manually discharging it as a substitute of hoping the voltage will dissipate if you happen to wait ten to thirty minutes. And if you would like to be taught extra about repairing your personal microwave and main home equipment, try Equipment Categorical for extra articles and product-specific tutorials.

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How to test a microwave's magnetron
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How to test a microwave's magnetron
Psalm 118:8

How to test a microwave's magnetron

Ever surprise in case your ‘700 watt’ microwave oven’s really cooking wherever close to its score? Does it appear slower nowadays than when it was new?

Right here’s a fast & simple method to discover out what’s happening in there:

Fill a Microwave-safe container with 1 rigorously measured liter of water, ideally at room temperature, about 70F, and measure its temperature (Fahrenheit) as precisely as attainable. Write that temp. down, and place the container within the MW. Set the timer for two:03, and hit begin. (If yours is a ‘mechanical timer’ kind, with simply a dial, use a stopwatch – this have to be precisely timed.)

Fastidiously measure the ‘finish’ temperature and multiply the distinction by 19.4. The result’s the approximate vitality acquire in watts. (I do know you’re questioning about these Three seconds – it takes about that lengthy for the magnetron tube’s filament to warmth and begin to ‘fireplace’, and we would like precisely 2 minutes of heating)

Take into account that it’s regular for a microwave to produce much less vitality because it ages (hmmm… sounds acquainted one way or the other!), however your outcomes must be inside about 50-75 watts of the score.

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Fred’s Equipment Academy January 6, 2020 Video Go away a Remark

How to test a microwave's magnetron

Testing a excessive voltage transformer from a microwave with an analog meter.

Notice: Earlier than testing any elements in a microwave, make certain the unit is unplugged and the excessive voltage capacitor has been discharged.

The transformer consists of three windings. Your main winding with the thicker wires, your secondary excessive voltage winding with the thinner wires, and your secondary low voltage winding that’s between the first and secondary windings.

To test the transformer, begin with the first winding, on the lookout for lower than 5 ohms. I counsel you employ R occasions one on the meter and calibrate. Place your meter leads throughout each terminals on the lookout for lower than 5 ohms. You’ll additionally need to verify every terminal to floor. The perfect place to discover floor is the place the mounting holes, the place the screws are on the transformer. Checking to be sure you haven’t any studying. For those who ever studying between floor and one of many terminals, the winding is shorted. For those who get no studying throughout each terminals, the winding will likely be open.

Testing our secondary excessive voltage winding, we are going to need to go forward and switch the transformer round on the lookout for the one wire by itself, or a spade terminal that possibly there. And we are going to need to go forward and set our meter to R occasions 10 and calibrate. We are going to place one-meter lead on the excessive voltage secondary winding and the opposite meter lead to floor, on the lookout for 35 to 150 ohms. For those who get no studying, your winding is open. For those who get lower than one, your winding has shorted.

To test our final winding, the secondary low voltage, which matches to the magnetron, set your meter again to R occasions one and calibrate. Place your meter leads throughout the secondary low voltage winding and we should always see lower than one ohm. Once more, if we get no studying, the winding is open, and if we get any studying to floor, the winding has shorted.