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An Unusual Microwave Oven Symptom Repaired

By on March 28, 2020
microwave oven transformer








A friend of mine approached me when I was picking up my son from school and asked me about his microwave oven. He had the oven in the trunk of his car and when I looked at it, it smelled like something was burnt in it and it smells like burnt bread.

burnt bread in microwave oven

What made the situation worse is the mom who tried to clean it up with water inside the microwave heating area so when the water got inside and they tried to use the oven, the earth leakage switch tripped so the customer was kind of scared why this was happening.

Later on I found out that his young daughter when she was alone in the house, tried to heat up some bread but kept it heating up for almost an hour so when the customer came into the house, there was dark smoke all over the place.

how to fix microwave oven

So the plan for this repair is to clean everything up and hope for the best and based on that I started a thrill cleaning inside the microwave oven.

microwave oven transformer

I started cleaning the main power transformer, the bleeding diode, the capacitor, the fan and then the magnetron heating head

heating heat in microwave oven

All these area were drawing in bunt stuff mixed with water but after the cleaning, it was almost spotless but it took me a lot of time and effort to get it clean.

cleaning microwave oven

That is the area of the capacitor, the bleeding diode and the transformer had been cleaned to get this microwave oven up and running.

how to fix microwave oven

That is the cover of the microwave oven from the inside and as you can see, it was cover in burnt bread and mixed with liquid.

I was so lucky to say that after all this cleaning and drying up any liquid in there, I was able to bring this microwave oven back to life. It was up and running to that I can say, it was a messy 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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Note: You can check his previous repair articles in the link below:




  1. Albert van Bemmelen

    March 28, 2020 at 3:28 pm

    Tripping Earth leakage switches are always bad news, just as cleaning up the sticky and smelly messy stuff that caused this. Luckily the Earth safety switch prevented the shorting power line current from doing any damage to the electronic parts of the oven.

    • Waleed Rishmawi

      March 29, 2020 at 5:34 pm

      Albert: yes i was lucky not to find bad parts in there..all went well. have a blessed day

  2. Parasuraman S

    March 28, 2020 at 4:53 pm

    Well done! Thorough cleaning is always a must step in our electronic service work! You have done a marvelous cleaning of the set to bring life back into it! Well appreciated!

    • Waleed Rishmawi

      March 29, 2020 at 5:35 pm

      Parasuraman: thank you. cleaning was not fun and the smell was just bad but it was better than the piss of the cat on that sound mixer that I worked on earlier. have a blessed day

  3. dan bandy

    March 29, 2020 at 6:11 am

    Yes it is ok to clean all the component of the microwave. I repair 5 with different problems , i change the magnatron, condenser or diode and is in function. I have un microwave on stand - by who start himself at 4 or 5 minutes less start function. in rest it is ok is in parametres , but is new , have 2 or 3 years and rarely on function. The digital sensors on face are in mask , i have no acces less distroyd.

  4. Yogesh Panchal

    March 29, 2020 at 3:47 pm


    Clean up this machine with Only Water made this machine so sticky and smelly messy stuff by the user... bit mixing soap could have done good job... Lol.....
    Good Cleaning work.

    • Waleed Rishmawi

      March 30, 2020 at 5:16 pm

      Yogesh: thank you for your input. yes, what I usually do when I clean the microwave at home is putting a cup of water in the machine, heat the water up and let the steam stay a little bit inside, then i just wipe everything off with a dry cloth. the steam make everything soft in there and with the dry cloth with the steam inside, make everything easy to come off. I taught his to my wife and so far we did not have any kind of problem. have a blessed day my friend.

  5. Waleed Rishmawi

    March 29, 2020 at 5:38 pm

    Dan: thanks for your input although i had a hard time understanding something of the things you are trying to say. have a blessed day


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