A breakdown of the microwave oven knocks us out of the rut: we have to take out pans and pans again for heating. One of the frequent breakdowns of the device is a blown fuse during a power surge. Everyone should know how and what to replace the fuse to quickly restore the microwave.
Fuse Design, Varieties
Why use a microwave fuse? It protects the electronics from voltage surges, or rather, its consequences. Instability in the network leads to a sharp jump in voltage and burnout of the electronic components of the microwave oven.
Therefore, before the current arrives at the “stuffing” of the equipment, it passes through a flask with a metal thread. If the value in the network exceeds the nominal, then the thread burns out, breaking the circuit and protecting the device.
The glass (ceramic) fuse bulb serves as a protective cover against splashes when melting the thread.
When the part burns out, the Samsung microwave (Samsung), Daewoo may not turn on.
How many are in the microwave? There are three types of protective devices:
- Network Located on the input cable. They provide protection not only for equipment from surges in the network, but also for the entire home circuit from short circuits. The latter often happens when one of the microwave elements fails. In case of any malfunction, the protection disconnects the equipment from the network.
- High voltage. Why do they fire? As soon as an overload occurs, the fuse breaks the circuit for the safety of the magnetron and transformer - one of the main components of the microwave oven. Sometimes, at the same time, the machine is knocked out on the shield. What does it look like and where is it located? It is located right next to the transformer and is locked in a plastic case.
- Another fuse is mounted on an electronically controlled microwave. Additionally, it serves as a converter of electric current to a suitable voltage for electronics. Where is? The protection element is located above the primary winding of the transformer and is enclosed in insulation. Therefore, if it burns out, changing it is quite difficult.
How to determine the type of fuse in your model? To do this, look at the instructions. High voltage products are very rare. And the point here is not the structural features, but the fact that they are not installed at all plants. Most often you can find a network.
If the high-voltage protection burns out, everything except heating will work in the microwave oven. You can set the dish to warm up, while the circle will rotate, but the food will remain cold.
If the network element burns, then the operation of the equipment is impossible.
DIY replacement
Before replacing a part, unplug the microwave oven. Arm yourself with a Phillips screwdriver and unscrew the screws securing the casing.
Now inspect the constituent elements. What does a blown fuse look like? On visual inspection, it will be swollen or black traces of fumes will be visible.
If the bulb is glass, you can see the tattered thread inside. With a short circuit, a breakdown is more difficult to detect. To do this, tests are carried out with a multimeter in resistance mode:
- Attach the probes to the contacts of the device.
- Everything is working properly if zero is displayed on the screen.
- If it displays a value other than zero or “OL” - the part has burned out, it is necessary to change it.
For repairs you will need identical elements. They must have the same dimensions and current spacing. Usually these indicators are indicated on the case. You can see them through a magnifying glass.
Important! Do not install a new fuse with your bare hands. Use pliers or rubber gloves. Some microwave parts retain voltage even when unplugged.
After installation, reassemble the device in the reverse order. When turning on, make sure that all elements are operational.
Do not carry out independent repairs if you have not done this before. Ignorance of the microwave device can lead not only to a complete breakdown, but also to electric shock.