How To Fix Microwave Oven With Overheating Problem
A computer technician brought this to my shop and explained that this microwave oven gets over heated. I had to ask, what do you mean by overheating? The best way was to show me what is really happening with it right there in my shop. He powered on the device and it was working fine. Then suddenly, it hit me; the fan was not working, I usually hear the sound of fan running but at this time, I could not hear it. I powered off the device and took it apart.
It is a medium size microwave oven and as you can see, it is Graetz made.
On the inside, it is just like any microwave oven although it says on the back it was made in China.
This is an outside view of the back of device where the fan sits. I just wanted to make sure that the air flow was not blocked with dirt. This fan is supposed to take and direct the flow of air from outside to inside to cool off the magnetron.
I took the fan out along with its plastic holder to test the coil on it.
As I was about to test the coil of this fan when I noticed the breaking of the coil windings and that was enough indication for me that the fan is out of order and it has to be replaced with a new one.
The parts of the microwave oven are hard to find. The only way to get them is from an old microwave oven that is usually found in the junk yard. I made a habit of collecting such parts in my workshop. When a microwave oven comes to my shop and the owner finds it too expensive to repair, I just buy the whole thing and then take them apart.
I sometimes get them for free. I throw away what is bad and keep what is good which saves me a lot of hassle driving the whole way to the junk yard and of course make more money of it.
I mounted the new fan on the plastic holder and then I attached to the body of the microwave oven. I turned the microwave oven on and at this time, the fan was running and the air was flowing smoothly from outside to inside keeping the magnetron cool and nice.
I did some testing on it and it passed with high stars. Mission accomplished.
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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David
July 20, 2018 at 10:25 pm
Did you do the 3 d tests you are working on a high voltage at a high current and no mention of safety what was the leakage measured on the door when the job was complete
Waleed Rishmawi
July 23, 2018 at 2:16 pm
David: I appreciate your comment and concern about safety but since I did not mess with the HT area I did not do any testing. it was a simple process of taking off a fan and putting a new one in.
Parasuraman S
July 21, 2018 at 12:49 pm
Good service! Double way beneficial, both by saving a device and another by recycling a part! Well done!
Waleed Rishmawi
July 23, 2018 at 2:17 pm
Parasuraman: thank you very much. have a great day
Albert van Bemmelen
July 21, 2018 at 3:33 pm
Inspiring article about making a habit of collecting parts Walleed! I used to think that the Microwave radiation element was always a Japan made product. But I now see that this LG is a China made (2M226) element.
Waleed Rishmawi
July 23, 2018 at 2:20 pm
Albert: i always collect used good parts either by going to the junk yard or buying old stuff from customers.
about the LG parts, this is a china made microwave oven but I think that some technician replaced that magnetron head earlier with an LG one. so I do not think it was in the original build of the microwave oven.
thanks for your comments. have a super day
Andrew F. Ali
July 22, 2018 at 12:51 am
Good job. As long as there was no repair work done on the HV section. I don't normally test for leakage.
Waleed Rishmawi
July 23, 2018 at 2:21 pm
Andrew: my thoughts exactly. thanks for commenting. have a super day
James
July 22, 2018 at 6:29 pm
Excellent Rendition yo'
Waleed Rishmawi
July 23, 2018 at 2:21 pm
James: thanks man. have a super day
Tim Sprouse
July 23, 2018 at 3:56 am
I spent years working for a shop that repaired school audio visual equipment. These fan motors are very similar to, if not the same, as the motors used in record players. Good article.
Waleed Rishmawi
July 23, 2018 at 2:22 pm
Tim: thanks for sharing. have a super day
Justice
July 23, 2018 at 3:09 pm
Keep old parts, very wise and you have taught me something valuable and right now I am going to strip fan from already disposed microwave, thanks to you Walleed.
Waleed Rishmawi
July 24, 2018 at 12:23 am
Justice: get fan, magnetron, table motor, transformer and the micro switches. Also front panel also are good to have.
Tito
July 26, 2018 at 9:47 pm
A nice repair Waleed and a good one.A good idea too for not throwing away the junk. You need them in times like these.
Waleed Rishmawi
July 26, 2018 at 11:44 pm
Tito: thanks