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Is magnetron replacement procedure difficult ?

Greetings, Based on symptoms, it appears that my magnetron is bad. I found a replacement part and will order it, if replcement procedure is not too difficult. I am knowledgeable about electronics and elecricity. Also, are there any extra manuals or documents to provide guidance for this task ? Thanks very much for your help. Gratefully, -Frank

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  • Frank Garza
    Frank Garza Mar 22, 2014

    Thank you VERY, VERY much Geoff !!!



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It should not be too difficult, but the fault could also be a failure of the HV transformer or the big capacitor in that circuit.

As you may be aware, the main precaution is to make sure the HV capacitor is fully discharged before you work on that circuit.

Some have a self discharge resistor, but that also can fail. Here is a typical circuit

and the diagram for your unit may be pasted to the inside of the casing. If you are sure it is the magnetron, you only have to discern the mechanical fixings of it after that.

Posted on Mar 22, 2014


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I have a kenmore model#721.66312500 it dosen't heat food

I have this same model and was able to fix it by replacing the magnetron.

I reviewed this repair manual first:

I paid special attention to the warnings to discharge the capacitor. If you don't know what this means, then you should have the work done by someone else.

Once I had the case off I saw that Kenmore includes a similar though shorter, repair guide in a pocket inside the unit.

I went through all the procedures described and they all passed, including the one to test the magnetron. I went through them a second time and still, they passed. Since the most common repair for microwaves appears to be the magnetron, I replaced that and it is working fine now. The instructions for all of this are included in the above PDF.

As a final note, I found a replacement magnetron on ebay for less than $20! The part number is 6324W1A001H.

Dec 12, 2013 | Microwave Ovens

2 Answers

CS Code

Inspect foil side of HV board for burned tracks toward lower side of board. If burned, check HV capacitors (High Voltage Capacitor Test Procedure) and HV transformers (High Voltage Transformer Test) for a short. Otherwise test other components as outlined above.
Solution: Replace defective components as necessary. If applicable, repair foil trace on HV board.
Hope that helps.........

Aug 29, 2008 | Amana RC17 Microwave Oven

1 Answer

How can I tell if the magnetron that was removed from my microwave is really bad?

That is a difficult question to answer, the magnetron would need to be tested to find out if the item is functional or not, do you see a part number on the old magnetron or date when it was assembled. Did the technician replace any other parts besides the magnetron, any information would be helpful.

Jun 05, 2012 | Dacor DCM24 Convection/Microwave Oven

1 Answer

Microwave has sort of burning odor,electrical smell

This caused by a defective magnetron, "heats food" and the odor is a classic symptom of a bad magnetron, cheaper to replace.

Apr 06, 2011 | GE Microwave Ovens

1 Answer

How to replace megatron on LG/Goldstar microwave?

Replacing a magnetron (not "megatron", by the way!) is not difficult. In most ovens, it's held in by a few screws (usually 4) and there are two wires connected to terminals on the mag. Often it's harder to get the oven apart than it is to change the part.

However, you shouldn't try replacing a magnetron yourself. There are lethal voltages present under the cover, often for a long while after you've unplugged the appliance. In addition, unless the mag is replaced properly there is a danger of excessive microwave leakage. This is a repair definitely best left for a professional.

But why consider replacing the magnetron at all? It's the costliest part to replace, and you may find it only a little more expensive to buy a new oven. In fact, for small countertop models, the replacement cost is frequently less than that of a new magnetron. And if you're trying to solve a "no heating" symptom, the magnetron may not even be the trouble.

If you are determined to do the job yourself, there are sites online with parts and how-to information. But I strongly advise you not to do it

Oct 06, 2010 | Microwave Ovens

2 Answers

Microwave turns on but will not heat up

The problem is that the magnetron circuit has failed. It is the magnetron that generates the microwaves to heat the food. Typically the magnetron shorts out. The symptoms is that when it is on, it creates a loud buzzing noise when it is shorted. The cost of the replacement magnetron is almost as much as the oven, and not cost effective to repair.

Jun 30, 2010 | GE Microwave Ovens

1 Answer

I just ran my GE microwave for 7 minutes while empty. Heard a pop sound and now it won't run. Is is ruined?

The worst thing you can do for any microwave is run it empty as you have found out the hard way. What has happened is RF from the magnetron has reflected back into your magnetron. Some models even have an RF filter window that has the same color as the insode of your unit but a fiber appearance. Running the unit empty causes the RF to burn through this RF filter and stright back into the magnetron itself. Some units have a thermal protection thermostat on the magnetron that turn off the power to the magnetron when it gets too hot. Since you heard a pop you could have a bad load capacitor that has failed or the chassis diode itself has failed. You can take the unit in for service but if they tell you that the magnetron needs replaced I would think hard about having it repaired as the cost can be as much as 50% of a new unit. the Cap and Diode replacements are much more resonable repairs. Good Luck.

Jan 10, 2010 | GE Spacemaker JVM1540 Microwave Oven

1 Answer

How to replace a electron for a jenn air microwave

maybe you mean MAGNETRON ... replacing the magnetron is not difficult if you are mechanically inclined .. the problem is getting a proper replacement that doesnt cost more than the oven .. there are also other things that can make the magnetron look bad ... diode, capacitor, transformer,triac and thermal switch ... but if you are sure the magnetron is bad then make absolutly sure the power is not connected before doing anything .. the voltage and current inside the microwave can be fatal if its plugged in ... the cover comes off with just a few screws (top sides and back) .. inside you will find the electronics and a fan that blows on the magnetron's fins .. there is a plug at the bottom of the magnetron that just pulls out ... there are 4 bolts at the top that hold the magnetron in place .. you may have to lossen the transformer or other things like panels to make room to remove the magnetron.. observe how the magnetron was oriented and install the new one the same way .. if you are not skilled in this sort of thing then it is far better to get someone to help you that is .. many ham radio operators (general class and above) have at least knowlege of how this works and how to work safely ..

Oct 05, 2009 | Jenn-Air Microwave Ovens

1 Answer

No heat from micro-wave

Possible problems with this are: bad tube, bad diode, bad relay on the controller or bad Triac (if no relays) and the capacitor (the large silver one.) If the set runs but doesn't cook... then the door switches aren't the problem nor is the fuse.

Aug 13, 2008 | GE JVM1440 Microwave Oven

1 Answer

GE Profile JE1660GB01 magnetron failure?

It pass the resistance tests and still be bad, and I suspect it is.

I would also suggest that you check the high voltage diode to be sure it's not shorted.

If the filament voltage and high voltage are both present at the magnetron terminals, and not loaded down, but there is no heat, then it's the magnetron.

As a pro with over 20 years of expereince, I have always measured the high votlage, but I will never recommend it to a non-professional. Without the right equipment and procedure, you and your equipment can be "fried". No kidding.

Here are some good links to safety & troubleshooting:

We're happy to help and we appreciate your thoughtful rating of our answer.

Dec 17, 2007 | GE JE1660 Microwave Oven

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