No Heat Up In Microwave Oven Repaired
A guy from an organization located in Bethlehem brought this LG microwave oven for repair. This device comes on but it does not produce any heat. Usually, with this kind of issue, I check for three things, the Magnetron head, power or simply just an open fuse. Let us find out.
This is the model number of this device.
Just few screws to come off and the cover was off to start the repair of this faulty device.
This is general view of the microwave oven from the side and as you can see, the main transformer, the capacitor, the fan and of course the magnetron on top. The first thing to do is to discharge the main capacitor which is a very important step to do otherwise you will get zapped with the high voltage stored in it.
These are the main transformer pins and it supposed to get 220 AC volts there otherwise the microwave oven will not come on.
In my case, the microwave oven was coming on therefore; the 220 AC volts were present here.
These are the two terminals of the magnetron and I am checking here if it was faulty or not. I did this checking by setting the multi meter on ohms and one probe on the body of the microwave oven and the second probe is touch one of the pins of the magnetron. If you get any ohms reading here, the magnetron is faulty and needed replacement but in my case, the magnetron was ok.
The third step to check the main fuse that connects one of the capacitor pin to the center tap of the transformer. I have come across many microwave ovens that do not heat and the main cause would be this fuse.
When I popped open the case of the fuse, I found out it was open and needed to be replaced. I did not have the same fuse ratings but for the sake of testing I added a thin wire there to make sure there are no other bad components in this microwave oven that needed attention.
As you can see here one side of the fuse is connected to the main capacitor and the other side is connected to the center tape of the main power transformer. And as I mentioned before you need to discharge this capacitor before doing any kind of work on it.
I put everything back together and tested the microwave oven and it passed the test. I will not in any way give it back to the customer without replacing the fuse there with an original one. I will pay a visit to a local electrical store and get some as soon as possible.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below: