Microwave: repair by hand. What should I do if the microwave oven malfunctions?

It's pretty unpleasant, when the technology that worked so well yesterday was suddenly stopped functioning today. What if the microwave broke down? Repairs with their own hands sometimes solve this problem. Occasionally, the cause of the malfunction is a minor malfunction, which can easily be eliminated without the use of special equipment. But there are breakdowns that require replacement parts. It is not difficult to understand the causes of the malfunction.

Kinds of microwave ovens

There is a certain sequence of connection of all components of the device. Typically, all secondary parts are connected in series, which simplifies the diagnostic process.

In terms of functionality, the presented household appliances replace some other kitchen appliances, such as an oven, a steamer. There are the simplest and rather complex models in the software field of such an electronic assistant, as a microwave oven. Repair yourself, you will need to study the device of a certain type of furnace.

There are microwave ovens with a capacity of up to 42 liters. The power of the wave reaches 900 W. Models in which the grill is provided, are quartz or TEN. The repair of each kind of microwave oven, produced at home, will require knowledge of the features of each part.

The interior coating of household appliances is made of stainless steel, enameled or bioceramic.

Microwave device

The components of the microwave oven are identical in their overwhelming majority for different types of devices. The microwave structure includes a power transformer, a winding, a safety diode, a high-voltage diode. Also, the integral winding and capacitor are integral components. The most significant detail creating the heating is the magnetron.

When repairing the microwave oven with your own hands, you should check each part until you find the cause of the malfunction.

Outwardly, the device consists of a chamber for food warming up, a magnetron of a transformer and a waveguide.

When repairing the microwave oven yourself, it is necessary to carry out diagnostics when the device is disconnected from the mains. The verification of each component part is carried out in sequence.

A power transformer converts the electrical energy of an alternating current of one voltage index to another voltage at a constant frequency.

Principle of operation

Operation of the microwave oven takes place in a certain sequence. In order to understand how to operate, in order to repair the microwave oven yourself, you should understand the process of the function of the equipment. Voltage 220 V goes to the winding of the transformer. It is at the bottom and looks like a bare copper wire. In fact, this element is covered with transparent insulation.

The coil is under secondary windings. There are two of them in the microwave. This is a normal wire, played alongside the primary structure. It is important to understand the device by performing microwave repairs yourself. What to do to conduct a qualitative restoration of the furnace's functions, the information on the organization of its work will answer.

Heating occurs in a good primary winding. An increase in the temperature of the cathode occurs at a voltage of 6.3 V. In the upper high-voltage winding 2 kV go to the output.

Here a capacitor is shunted by the diode. A negative half-wave goes to the cathode, and the capacitance is filled with positively charged electrons.

Then the electrode is charged with two voltages, taken from the capacitor and the transformer. The total value is approximately 4 kV, and due to this, the generation process takes place.

The output windings are connected in parallel to the magnetron.

Magnetron

Repairing the microwave oven with your own hands, you should pay attention to the magnetron. In structure, it plays the role of the heart of the device. It generates microwave beams, which heat food inside the chamber.

This element contains a number of components:

• Emitter;
• Resonance cavities;
• anode;
• cathode.

This is a complex device, therefore it is necessary to check its serviceability in case of problems in the operation of the equipment. When the oven is turned off from the furnace, the resistance of the magnetron is checked using a measuring device.

If you rely on the information of this diagnosis, it becomes clear whether the device needs to be replaced, repaired, or the cause of the breakdown is another constituent part.

Simple causes of malfunction

It happens that the microwave repair by their own hands is carried out without replacement of details and complex manipulations. This happens with certain events that caused the non-working state of the equipment.

The cause of the failure is sometimes insufficient network voltage. If the indicator decreases by 20 V, the heating level decreases or the operation of the furnace stops. Uninterruptible power supply unit will solve the problem.

Overloading the mains also causes a malfunction in the microwave. For powerful equipment it is better to bring a separate outlet.

When the door latch breaks, the food does not heat up properly. Close the microwave oven tightly.

Due to the inattention of users, products that remained cold could just heat up in the wrong mode. For example, before this, the microwave oven thawed meat, and after that the regime was not transferred to high power.

If the cause of the failure is not eliminated by the listed methods, you will have to perform more serious repairs: check the operation of the magnetron, capacitor, fuses and high-voltage diode.

Fuse

Self-repair of microwave ovens begins with the removal of the back cover of the appliance (when the plug is disconnected from the mains). To indicate the breakage of the fuses may be their blackening or burning of the filament inside. It is necessary to replace this part with a new one. Usually there are two fuses in the microwave.

In the event that the necessary part is missing, you should purchase it in a specialized store. You need to take a non-working bodyguard, since you will have to pick up exactly the same device. This will ensure correct and safe operation of the equipment.

You can not use "bugs" made of fine wire to eliminate this breakage. They can cause a fire. The likelihood of such a situation is quite high. Therefore, you will definitely need to purchase a normal fuse. Its cost is low.

Capacitor

When noise and clattering occur during the operation of the microwave oven, a possible cause is the penetration of the capacitor. When repairing microwave ovens independently, the ohmmeter is connected to the condenser. If the arrow of the device deviates, then the workpiece is working. Otherwise, this is the cause of the malfunction. Its diagnosis is quite simple. The ohmmeter will help you to repair the microwave oven yourself. An example of its use should be considered in more detail.

According to the requirements of the safety regulations, the capacitor must be discharged before testing. While it is in a charged state, it is strictly forbidden to touch it with your hands or even a screwdriver. It's not safe for humans.

High-voltage diode

If the interior of the heating chamber has traces of fumes, smoke, sparks are visible, it can be a breakdown of a high-voltage diode. An example of the failure of this part is also noise when turning on and blown fuses. Check the serviceability of the part by using a high-voltage capacitor. It should not heat up.

If the cause of the failure is the failure of the high-voltage diode, you should purchase a new part. In view of the complexity of its device, only this output provides for the repair of microwave ovens. The review of the recommendations of professional masters allows us to conclude that the old high-voltage diode is very difficult to repair. It is necessary to replace the part and check the operation of the high-voltage capacitor. If it does not heat up, the breakdown is eliminated.

Breakdown of the magnetron

The most basic device that provides the work of a microwave oven is the magnetron. It generates ultrahigh-frequency (UHF) waves. Its replacement will cost more than replacing any other part. In some cases it is even inappropriate to repair microwave ovens according to reviews of specialists.

A sign of the failure of the presented part is the buzz inside the furnace. The food does not heat up, although all functions are performed visually. Inside the heating chamber, the light is on, the microwave is running.

Repairs themselves start with a survey of the magnetron. If it is not visible on the deposit or cracks, it is replaced by an ohmmeter. The burnt out element is replaced with exactly the same new one. The magnetron must match the parameters of a particular microwave model. It is forbidden to replace it with another type of furnace.

Causes of breakdowns

The most common cause of malfunctions in household appliances is its improper operation. In order to prevent the occurrence of malfunctions and problems in the use of the microwave oven in the future, it is necessary to familiarize yourself with a number of the most frequent causes of malfunctions. These include:

• Reheating food in metal dishes or the presence of similar objects in the chamber (for example, spoons or forks);
• The inclusion of a microwave oven without food inside;
• Warming up raw eggs or other products that are exploding under the influence of microwave beams.

Occasionally, the microwave will stop heating products due to physical wear and aging of its elements over time.

The ingress of fat from the products into the moving parts of the device, its settling on the walls arise because there is no protective cap inside the furnace or its improper condition. This can lead to the need to repair the microwave oven with their own hands. The cap must be replaced as it wears out. This will prevent problems in the future.

Care of the device

Carrying out the rules of care for a microwave oven, you can significantly reduce the risk of premature failure of equipment:

• You should carefully read the operating instructions from the manufacturer.
• The maintenance of the equipment in its purity will significantly prolong its service life. Wipe the microwave after each heating of food in it.
• The use of a protective cap, its periodic replacement will not allow you to independently repair the microwave oven for a very long time.
• If the house has children, it is necessary to provide inaccessibility for them of this technique.

In the event of an emergency situation or a mismatch between the functions performed by the equipment declared in the instruction, it is possible to restore the operation of a kitchen assistant, such as a microwave oven. Self repair will reduce the cost of solving this problem.

Understanding the device and the principle of operation of the furnace, it is not difficult to perform replacement of parts by yourself. Fulfilling all the rules for the operation of the microwave oven, one can not for a very long time come across the problem of repairing the presented equipment.