MICRO-ONDAS MIDEIA NÃO ESQUENTA AULA - 03

Summary

In this video, the host provides a detailed guide on troubleshooting and repairing a microwave that isn't heating. The process includes checking various components such as the magnetron, fuse, and capacitor to identify the root cause. The host explains how to test each part using a multimeter to determine if they are functioning properly. With a focus on practical steps and clear demonstrations, viewers learn how to address common microwave issues, ensuring they understand the necessary repairs to get their appliance working again. The video is aimed at DIY enthusiasts and those interested in appliance repair.

Takeaways

• 😀 Make sure the microwave is turning on before troubleshooting. If it's not, check the power supply and fuses.
• 😀 The magnetron is responsible for heating the food in the microwave. If it’s faulty, the microwave won’t heat.
• 😀 Use a multimeter to test the continuity of the magnetron. It should not show continuity to its metal casing.
• 😀 If the magnetron is shorted, it may blow the fuse and cause the microwave to stop working altogether.
• 😀 Always test fuses with a multimeter to ensure they are intact. If the multimeter doesn't beep, the fuse is blown.
• 😀 There are two fuses in a microwave: one for low voltage and one for high voltage. Both should be checked during troubleshooting.
• 😀 The capacitor stores electrical energy for the magnetron. If it's faulty, the microwave won’t heat food.
• 😀 To test the capacitor, use the capacitance setting on the multimeter and look for a small increase in resistance.
• 😀 If the capacitor is shorted, it will show zero resistance and must be replaced.
• 😀 The high-voltage transformer is another key component to check. If it’s not working, the microwave will not heat, even if the rest of the components are fine.
• 😀 If you're not comfortable performing the repairs yourself, it's safer to contact a professional technician for further assistance.

Q & A

What is the primary issue with the microwave discussed in the video?

The primary issue is that the microwave is turning on but not heating food.

What is the role of the magnetron in a microwave?

The magnetron is responsible for generating microwave radiation, which heats the food inside the microwave.

How can you check if the magnetron is functioning properly?

You can check the magnetron by testing it for continuity with a multimeter. If it shows no continuity, it might be broken.

What should be tested if the microwave is not heating but is turning on?

You should test the fuse, magnetron, thermal fuse, and capacitor to identify the problem.

What happens if the fuse inside the microwave blows?

If the fuse blows, it will prevent the microwave from operating properly. The microwave may still turn on, but it won't heat anything.

How do you test the thermal fuse?

The thermal fuse can be tested with a multimeter by checking for continuity. If there's no continuity, the fuse is faulty and needs to be replaced.

What are the two main tests for the capacitor?

The two main tests for the capacitor are testing for short-circuit (by checking for continuity) and testing the capacitance (to check if it's working within the required range).

What is a sign that the capacitor is faulty?

If the capacitor shows continuity when it shouldn't, or if its capacitance is not within the required range, it indicates that the capacitor is faulty.

What should you do if the fuse is not functioning?

If the fuse is not functioning, it needs to be replaced. The video suggests that the fuse can be repaired, but replacement is often the best option.

What is the troubleshooting process if the microwave still doesn't heat after checking the common issues?

If the microwave still doesn't heat, check if the transformer is receiving the correct voltage. If the transformer is working, then the issue might lie with the control board or switches.