How to Test and Replace a Microwave Magnetron

Jul 28, 2023, 18:17pm

In your microwave, the magnetron is used to produce the waves that will heat the food. It is electrically powered by a very high voltage, supplied by the transformer.

This part may need to be replaced if:

  • Your appliance does not heat up or not enough
  • You observe sparks in your microwave
  • The microwave makes a lot of noise
  • The microwave stops during heating

The magnetron is inside the microwave, behind the control panel. It looks like a gray box, often fixed in height.

A magnetron is the component in your microwave that generates the actual microwaves for cooking the food. If your microwave isn’t heating up food, but you hear a buzzing or humming noise, it could be the magnetron that’s causing the problem. While testing and replacing a microwave magnetron is a little more complex than some other parts, it’s certainly possible to do at home with the right tools. This article provides a step-by-step guide on how to test and replace a microwave magnetron.

How to Test and Replace a Microwave Magnetron

Important Safety Notice: Working with microwaves can be dangerous due to high voltage and the risk of microwave radiation if the magnetron is damaged. Always prioritize safety and if you’re uncomfortable or unsure about performing the repair, hire a professional.

Tools You’ll Need:

  • Screwdriver set
  • Multimeter
  • Gloves and safety goggles
  • A new magnetron compatible with your microwave model

Steps to Test and Replace a Microwave Magnetron

1. Safety Precautions: Unplug your microwave before starting any work to avoid the risk of electric shock.

2. Remove the Microwave Cover: Using your screwdriver set, remove the screws that hold the outer cover of the microwave in place and take off the cover.

3. Locate the Magnetron: The magnetron is typically a large, rectangular device with cooling fins and two terminals, located near the side of the microwave.

4. Test the Magnetron: With the microwave unplugged, you can test the magnetron using a multimeter. Set the multimeter to test resistance, and touch one probe to each terminal. A normal magnetron will read zero Ohms of resistance from one terminal to the other. If your multimeter does not show this reading, the magnetron is faulty and needs replacement.

5. Remove the Faulty Magnetron: Before removing the magnetron, take a picture or make a note of the wiring setup for future reference. You’ll need to remove the wires connected to the magnetron and then unscrew the device from the microwave.

How to Test and Replace a Microwave Magnetron

6. Install the New Magnetron: Once the old magnetron is out, you can install the new one. Attach the new magnetron to the microwave using screws, then connect the wires as they were in the old setup.

7. Reassemble the Microwave: Replace the cover of the microwave and secure it with the screws you set aside earlier.

8. Test the Microwave: Plug the new power cable into an electrical outlet and test the microwave to ensure it’s working correctly. If there’s any issue, immediately unplug the microwave and consult a professional.

In conclusion, testing and replacing a microwave magnetron is a bit more complex task, but with careful attention to safety, it can be done. However, if you have any doubts or feel uncomfortable performing this task, it’s always best to call a professional technician. Regular maintenance of your appliances can help ensure their longevity and optimal performance.