Do-it-yourself candy microwave repair. We repair the microwave oven with our own hands without services

We bring to your attention another article to help the home master. Her theme will be the repair of Samsung, LG, Panasonic microwave ovens, as well as other popular brands. In the introductory part, we will briefly talk about the principle of operation and design features of microwave ovens. After that, we give a list of typical malfunctions, an algorithm for diagnosing a breakdown and ways to solve the problem. Next, consider a real case of microwave repair, using the example of the LG-4022G model.

Device and principle of operation

We will superficially consider this issue, so as not to get away from the main topic. The information will be simplified as much as possible, since not all home craftsmen have a deep knowledge of electrical engineering. Let's start with the description and purpose of the main structural elements, they are presented in the figure below.

Rice. 1. Microwave device

Designations:

1. Door latches serve both for fixing the latter and for the system of blocking work in the open position.
2. A rotating tray on which dielectric cookware is placed.
3. A separator equipped with rollers that drives the pallet.
4. Drive that rotates the separator.
5. Backlight lamp, turns on depending on the operating mode.
6. Ventilation (usually forced).
7. The magnetron is a microwave radiation generator, in fact, it is the main structural element. You can find out how it works and how it works by reading an article on our website dedicated to this issue.
8. The waveguide provides the movement of microwave waves to the microwave chamber. Represents a hollow metal pipe of rectangular section.
9. high voltage diode.
10. Capacitor.
11. Waveguide power circuit transformer and control circuit.
12. Control block.

We will not give a complete circuit diagram of the device, since they can vary greatly in different models of microwave ovens. In our case, the power circuit of the magnetron will suffice. As a rule, it has a typical structure.

Let us briefly describe the principle of operation of the above scheme. Power is supplied to the primary winding of the transformer (I) from an external control circuit that regulates the power and duration of microwave radiation. One of the secondary windings (II) supplies voltage to the magnetron filament. Winding II is made of 2-4 turns of thick wire, since the current in the filament circuit can reach 10.0 A at a voltage of about 3 volts.

Another secondary winding (III), which provides a high voltage level (up to 3.0 kV), is commonly called anode. As can be seen from the figure, in this circuit, a rectifier and a voltage multiplier are built on the basis of a high-voltage diode (VD1) and a capacitor (C1). At the same time, VD1 is turned on so that the opening occurs at a positive half-cycle, as a result, the capacitor begins to charge. When the negative half-cycle begins, the diode VD1 closes and the voltage is supplied to the magnetron M1 together with the charge accumulated on the capacitor. This leads to a doubling of the voltage and the formation of an electric field of the desired intensity in the magnetron.

The resistance R1 in this case is necessary for the discharge of C1. As a rule, this resistor is located in the capacitor case. As for VD2, it provides protection in the event of an increase in voltage on the capacitance C1 or a short circuit in the magnetron M1.

Preparatory stage

Before proceeding with the repair, it is necessary to collect as much information as possible about the failed device. Ideally, this is a service manual for the specific model. In this document, the manufacturer provides all the necessary data, starting from the assembly drawing (exploded view, literally from the English explosion diagram) and ending with the troubleshooting algorithm.

If the documentation could not be found, and this will happen in most cases, do not be discouraged, typical microwave oven malfunctions can be determined even without a circuit diagram. It is enough to know what the main elements look like and where they can be located. A photo of the microwave with the cover removed will help you with this.

The intuition of the process in most cases allows you to remove the casing without an assembly drawing and get to the main structural elements. But in this case, it is necessary to remember the sequence of actions and try not to leave "extra" parts after reassembly.

What tools are needed?

In most cases, you can get by with a Phillips screwdriver and. In some cases, you may also need a soldering iron. Accordingly, spare parts will also be needed, which ones will be clear after the diagnosis.

Typical malfunctions and methods for their elimination

Before considering in detail the elimination of the malfunctions listed below, we consider it necessary to warn that before diagnostics and repair it is necessary to physically disconnect the device from the power supply, that is, pull the plug from the outlet.

No response to power button.

In this case, diagnostics and repair should obey the following algorithm of actions:

1. We check the presence of voltage in the power supply. If it is not there, we solve the problem with the power supply, otherwise we proceed to the next step.
2. We check the power supply of the control module. We start with the fuse. If it is burned out, we will replace it. After that, turn on the device, and try to heat, for example, a glass of water. If everything works, the repair is complete. If the fuse blows, the problem is in the control module, it should be repaired or replaced.

To repair the control module yourself, you must have certain skills in radio electronics; without them, it is not recommended to start repairing the control module yourself.

The microwave oven does not turn off after working off the mode.

In most cases, this problem indicates a malfunction of the door position microswitch. To fix the problem, we find, check and, if necessary, replace the switch.

If the microswitches are normal, then the problem may be related to the relay that provides voltage to the magnetron power circuit. We “ring” the relay contacts with a multimeter, if they are “stuck”, we change the electrical switch to a new one.

When no problems are found with the relay, it means that the malfunction is related to the control unit, we change or repair it.

Weak heating.

Most often, this malfunction is associated with a voltage drop in the household electrical network. If it falls below 205.0-210.0 V, there is a sharp decrease in the intensity of the microwave flux. This problem is typical for private houses in rural areas, where a voltage drop occurs regularly, and as a result, a voltage drop.

If the multimeter shows the acceptable voltage level of the household network, then you should check the power circuit of the magnetron, we will describe how to do this in the next section.

When the diagnostics of the magnetron circuit did not give results, then everything points to problems with the control module.

No heating.

Such a malfunction clearly indicates a malfunction in the magnetron power circuit. Diagnostics is performed as follows:

1. We check with a multimeter the presence of voltage on the primary winding T1 (see Fig. 1). If not, the problem should be sought in the control module.
2. The presence of voltage indicates that it is necessary to check the fuse of the high-voltage circuit, transformer T1, fuse, capacitance C1, diode VD1 and the magnetron itself. Checking of the listed elements is carried out with the power off!
3. We “ring” the fuse with a multimeter by switching it to the diode test or resistance measurement mode. If the device shows a break, we replace the fuse.
4. We check T1, open circuit and short circuit of the primary and secondary windings.
5. We are testing the capacity of C1, it was described on our website.
6. “Calling” VD If anyone is unfamiliar with the diode testing technology, then you can familiarize yourself with it in a previously published article.
7. We check the magnetron. There are certain features with its testing, so let's consider this process in more detail:

• First of all, it is necessary to “ring out” the filament, if the multimeter shows resistance close to zero (see a in Fig. 6), then everything is fine with it, we continue testing. If the device shows an open circuit, check the contact of the filter coils (marked with yellow arrows in b Fig. 6). If there are problems with the coil attachment contact, the device can be restored, otherwise, everything indicates the need to replace it.
• After testing the thread, we check the passage capacities for breakdown. To do this, we transfer the multimeter to the "dialing" mode, with one probe we touch the case, with the second we alternately touch the contacts of the magnetron (b in Fig. 6). The normal indicator will be infinite resistance, otherwise everything indicates that the capacitance is broken, which means that the magnetron needs to be replaced.
• If the magnetron test fails, it is necessary to measure the input voltages on the device. If they are below the permissible parameters, then this may be caused by an interturn short circuit in a high-voltage transformer or a reduced power level in the household power supply.

Rice. 6. Checking the magnetron

Important! The magnetron must be changed to the same type. This is due to the fact that the parameters of the high-voltage transformer and control circuit are calculated based on a specific model of the microwave generator.

Sparking is observed.

Such a malfunction can be caused by the following reasons:

1. Burnout of a mica plate that isolates the waveguide from splashes and pieces of food. The plate is located inside the chamber on the side of the magnetron. The state is determined visually. If the problem is with the plate, it is enough to replace it.
2. During operation, the lid of the coupler burned out. This is such a plastic cap that rotates the pallet. In this case, only a replacement will help. Naturally, it is necessary to install the coupler from the same type of models, since the design of such a cover can be different even from one manufacturer.
3. The “wrong” dishes are installed in the chamber. We remind you that metal utensils, as well as those on which metallized dyes are applied, cannot be used in microwave ovens.

Tray does not rotate.

First of all, it is necessary to check whether the pallet is blocked by any foreign object, whether it is installed correctly or the separator. If everything is fine, then the cause lies in the drive. This may be due to the following reasons:

1. stuck engine(determined tactilely) or a break in one (dialing is carried out) of the windings. In these cases, the drive needs to be replaced.
2. Gearbox problem. In this case, everything depends on the design. In some cases, the gearbox can be repaired. But, as practice shows, it will be easier and cheaper to replace it.

There is no response to the control panel.

In modern electronic models, such a malfunction indicates problems with the control module. In products with an electromechanical control system, it makes sense to check the mechanical relays and / or switches, if necessary, replace the defective parts.

When turned on, the display does not work.

If the power indicator lights up when turned on, but the digital display does not work, then everything indicates problems with the control module. It needs to be repaired or replaced.

The fuse blows when the door is closed

Characteristic indicator of faulty microswitches on the position of the door. One of them is “stuck” and does not switch, as a result, a short circuit occurs in the control circuit. The repair consists in replacing or cleaning the microswitches.

An example of a step-by-step repair of a microwave oven LG MB-4022G

There can be a lot of reasons for breakdowns and malfunctions of a microwave oven, as you have already seen above. Most often, this is a failure of the magnetron itself, due to improper operation of the device, namely the use of dishes not intended for cooking in a microwave oven. Also various metal parts that may accidentally be inside during operation.

But sometimes there are minor breakdowns that can be easily fixed without special tools and without spending a lot of money.

Below, the article will describe one of these breakdowns, and how to fix this malfunction. The photo shows a stove that has stopped turning on and does not react in any way to manipulations with the control knobs.

Rice. 7. LG MB-4022G

Before removing the protective cover from the oven, it is necessary to carefully inspect the power cord and the plug itself for damage, breaks and cuts. If there are any, then the oven should be disassembled.

To do this, you need a Phillips screwdriver.

We unfold the oven with the back side facing us, and unscrewing the two fastening screws, remove the ventilation cover. Next, remove the protective cover.

Rice. 8. Remove the protective cover
Rice. 9. Unscrew the screws

It is attached to the back with several screws. We unscrew them all.

When all the rear screws are unscrewed, go to the side, left side.

Rice. 10. Unscrew the left side

There are three mounting screws, two on the bottom and one in the middle. They should also be unlocked. As you unscrew the screws, you can observe how the metal edges of the cover move away from the chassis of the case.

Rice. 11. We continue to unscrew the screws and remove the covers
Rice. 12. Cover from the inside

You can see traces of soot, which were formed due to the action of high temperatures.

The removed cover freed access to the main elements of the microwave oven (Fig. 13). Above, you can see the elements for the grill - a heating element located in a special case.

Rice. 13. Microwave internals

On the left is the magnetron itself (Fig. 14), namely its upper part.

Rice. 14. Microwave oven magnetron

At the bottom left is the power filter, from which the wires and the network cable come off. Even on the top of the chamber, you can see two temperature sensors. They are attached to the case and react to temperature changes. They are connected to two wires.

Rice. 15. Power filter and 2 temperature sensors

If you look from the side, then other elements open up to the eye. For example, a power transformer with a step-up winding.

Rice. 16. Power transformer

We also see the magnetron radiator.

Rice. 17. Magnetron heatsink

And look at the power switch.

Rice. 18. Power switch

Time relay with a sound signal, the role of which is performed by a mechanical bell (Fig. 19).

Rice. 19. Time relay

Fan blowing the magnetron radiator (Fig. 20). It prevents overheating of this important expensive part.

Rice. 20. Magnetron fan

There is almost nothing on the right side (Fig. 21).

Rice. 21. Right side

Let's start by inspecting the power filter, because it is where the network cable comes in, and then the voltage from the board goes to other elements of the furnace. Therefore, the place where the voltage "disappears" must be sought from the side of its supply, that is, the network cable.

So, on the power filter board we find the terminals where the power wires come, namely blue and brown (Fig. 22).

Rice. 22. Power wires

We turn on the power cord in the network and measure the voltage in this section of the circuit. The device shows that the mains voltage - 220 volts comes to the board. This means that the power cord is one hundred percent intact, and this indicates that the problem is further along the circuit.

Rice. 23. We measure the voltage on the circuit section

There is a fuse on the power filter board, which may be the reason that the voltage does not pass further.

Rice. 24. Checking the fuse

We measure the integrity of the fuse with a circuit tester. This can be done without removing the fuse from the installation clamps, but before that it is necessary to de-energize the device by removing the power plug from the socket.

The device shows the circuit, which means that the fuse is intact and the problem is not in it.

Rice. 25. Brown wire

Here, this device is responsible for disconnecting the microwave oven from the network if the case temperature is critical, that is, it is more than 150 degrees. At this temperature, the bimetallic contacts located in the device case open and interrupt the circuit. After the body cools down, they return to their original position.

You can check its integrity with the same device that measures the integrity of the circuit (Fig. 26).

Rice. 26. Checking the temperature sensor

To do this, remove one end of the wire from the terminal so that the circuit does not make false readings. We connect the probes of the device with the terminals of the sensor and look at the result. As you can see, the device shows an open circuit, which means that the sensor is not working.

To restore the sensor, sometimes a sharp shake or a blow to it with some object, such as pliers or a screwdriver sting, helps. But even if the device recovers, there is a risk that in case of critical overheating it will not work, and the consequences can be disastrous.

Therefore, in order not to risk, it is better to replace the device with a new one, especially since its cost is about two dollars. You can easily find it in one of the online stores. Rice. 28. Temperature sensor: view from the back

This thermostat is bimetal KSD 201.

The marking indicates that it turns off at temperatures above 145 degrees and is restored when the temperature drops below 60 degrees.

Removing the sensor is easy (Fig. 29), it is enough to pry off one of the mounting lamellas with a screwdriver, and it can be easily removed. Before you remove it, you need to disconnect the wires. If you mix up the wires when installing a new sensor, this will not affect its operation in any way.

Rice. 29. Remove the sensor

After purchasing this device, we install it in its original place, and connect the wire from the filter board to it. We do not connect the second wire yet. The sensor head must fit snugly against the camera body. We connect the device to the terminals of the temperature sensor and check its integrity.

Now the device shows the circuit (Fig. 30), which means that it is intact. Next, we connect the second wire and check the quality of the connection by twitching it.

Rice. 30. Check the integrity of the new sensor

Now we turn on the power plug in the network and use a voltage indicator to check if voltage is coming to the sensor. To do this, we connect one probe of the device to the blue wire on the power filter board, and the second to the sensor - the near end - to which the brown wire comes.

Rice. 31. Check if the voltage comes to the sensor

If the result is positive, and in the photo (Fig. 31) this is exactly the case, then we measure the voltage at the output of the sensor (Fig. 32). The device shows that it is also present, as in the first case.

Rice. 32. We measure the voltage at the output of the temperature sensor of the multicooker

Although it is undesirable to do this, without putting on a protective cover, we apply voltage to the furnace, and by setting the minimum temperature, turn on the device.

The furnace has started and is working (Fig. 33).

Rice. 33. Checking the performance of the microwave oven

We quickly turn off the device and put on a protective metal casing.

You need to install the housing cover in the reverse order, that is, by inserting its front part into the grooves and fixing the back part on the screws.

Simple DIY Microwave Repair: 5 Solutions to Major Problems

It is rare that a kitchen can be imagined without a microwave. Recently, she If you do not have experience repairing a microwave oven, then it is better to seek help from professionals. internally took its position in the daily life of housewives. Therefore, when it breaks it is akin to a small disaster. Someone immediately carries it to a service center, while someone tries to fix it with their own hands. It is quite possible to do this if there is an initial knowledge of electronics and device design.

Do-it-yourself microwave repair: the main elements of the device

If the microwave oven breaks down, you can immediately take it to a service center, or you can try to repair it yourself, while saving money.

But before you start repairing a microwave oven, you should understand that a person who has at least some knowledge in electronics and electrical engineering can repair a microwave oven in a quality manner.

Before you start repairing a microwave oven, you should study its components

Also, when working, you must follow all safety rules.

To repair microwaves, you need to know the following basic elements:

• Energy-converting transformer;
• Magnetron;
• Rectifier;
• Fuse;
• Fan;
• Capacitor;
• Control block.

Understanding where and what is quite simple. Right in the middle of the chamber is a magnetron, and underneath it is a transformer. The fuse, capacitor and rectifier should be located to the right of it. As for the control unit, it is often located near the input panel.

Before starting repairs, be sure to disconnect the device from the network!

If the breakdown consists in the failure of one of the main elements, then it will be easiest to replace it. The fact is that many parts of the furnace cannot be repaired, but only new ones can be bought. This is especially true for capacitors, fuses and diodes.

If the replacement is real, then you should perform the following steps:

• Disconnect the oven from the mains;
• Discharge the transformer (it will take about 5 minutes);
• Disconnect the desired part from the terminals and remove;
• Put the work piece in place.

When replacing, you need to pay attention to the correspondence of the diagram and the new part. If the new element and the circuit are incompatible, then this can lead to new breakdowns.

In the event of a failure of the electronics, it is still better to seek help from professionals who will carry out high-quality repair of the microwave oven.

Frequent breakdowns of the microwave: do-it-yourself repair, in detail

The fact that the furnace has broken down or is not working, as a rule, is signaled by some signs. According to them, the cause of the breakdown is determined.

Very often microwave ovens break down due to unstable voltage.

So, what could it be, in more detail:

1. The microwave does not turn on - in this case, the power cord may be damaged, the door may not be fully closed, or the fuse may have blown. If the problem is in the cord or the outlet is overloaded, then the problem is solved simply by replacing the elements. An open door may prevent the microwave from starting, as this is dangerous, so it is worth checking the latch and the operation of the door. If the fuse (which prevents damage to the device due to power surges) or thermal relay is blown, then they are also easy to change.
2. The stove works without turning off the relay responsible for supplying electricity to the device - this can happen due to sticking of the contacts. You need to get the relay and check its operation with an ohmmeter, and if it does not work, replace it.
3. The microwave works, but turns off after a few seconds - the problem is in the thermal fuse. Unfortunately, it will not be possible to repair it - you will have to buy a new one.
4. The plate with products does not spin - in this case, you need to check the connection of the plate itself and the engine. You need to remove the pan and look at the integrity of the wire, if it is disconnected or clogged, then you need to clean it and connect it again.
5. The oven is buzzing a lot - most likely, the problem is in the fan or transformer. The latter is unlikely to be repaired - it is easier to replace it. A fan problem may occur due to recycling if the device has been actively used for a long time. In this case, you need to clean the blades of the cooling element.

This is how the most common malfunctions that you can do yourself look like. When working with electricity and checking the elements of the furnace, one should not forget about safety precautions.

Do-it-yourself repair of the microwave touch panel with your own hands

The microwave oven may have a touch or conventional control panel, which may be affected by exposure to high temperatures.

As a rule, problems with this part occur after 3-4 years of intensive use, and are expressed in the failure of the “obey commands” buttons. At the same time, some error can be displayed on the scoreboard. The oven can turn itself on or off. The main reason for such phenomena is the closure of the panel contacts.

Materials for repairing a microwave touch panel are sold at a hardware store

Self-repair of the touch panel of the device consists of the following steps:

1. First you need to disconnect the microwave oven from the mains and disassemble the panel - the latter consists of a film with buttons painted on it and two membrane gaskets with contacts.
2. Next, with a thin sharp knife, you need to pry off the touch film, while trying not to damage the membrane. It is best to start from the bottom or top corner on the left.
3. After removing the membrane, you need to check the operation of the panel by closing the contacts. Inside the oven, you can put a container with water. If everything works, you can start repairing the panel.
4. Again, you need to disconnect from the network and wipe all contacts with alcohol. To increase the gaps between them and exclude the possibility of a short circuit, you need to glue these places with pieces of electrical tape or adhesive tape.
5. Next, the upper membrane is put in its place, after which the operation of the microwave is checked. If something doesn’t work again or hardly responds to pressing, you should again turn off the stove, peel off the membrane film and remove the electrical tape or add it somewhere (depending on what doesn’t work). Do this until the buttons work as they should.

A touch panel repaired in this way can work for about six months, but it may continue to bend further, after which it will again have to be “straightened” or bought a new one.

Do-it-yourself microwave magnetron functions and repair

If the microwave oven sparks, stops heating food, or starts doing it for too long, the problem is most likely in the magnetron, which is the main heating element of the microwave device.

By the way, changing the magnetron in a microwave oven that has been serving for more than 5 years is unprofitable from an economic point of view.

Before you start repairing the microwave magnetron, you need to watch the training video and read the recommendations of specialists

As a rule, this device is "planted" on the terminals and screws that fix it to the base of the stove. However, replacement of the magnetron is required in rare cases. Basically, problems in its operation begin when the protective cap of the element burns out.

In this case, there are several options for solving the problem:

• The cap is manually descaled and rotated 180 degrees;
• A new cap is made from a suitable capacitor housing;
• It will also not be superfluous to replace the mica plate, which is exposed to harmful rays.

Actually, there is nothing complicated in repairing a magnetron, but if the problem is not in a burnt cap, but a little more serious, then it is better to entrust such repairs to specialists.

Do-it-yourself microwave repair (video)

You can repair a microwave oven yourself if you have some knowledge of the operation of electrical appliances. However, there is nothing complicated in such a procedure. The main thing is to remember the safety measures and proceed with caution. Knowing the main elements of the device device, you can calculate the cause of the breakdown yourself and eliminate it.

It becomes clear that many site visitors have difficulty disassembling the door. It is not surprising, because in the article, for example, only one design option for this part of the microwave is presented, when in fact there are a great many of them. To fill this gap, I decided to write several articles in which special attention is paid to the disassembly of the door and the extraction of the most frequently failing parts from its structure, such as: protective glass or bolt.

Despite the wide variety of designs, all microwave oven doors have the same layered structure, and can differ from each other only in the number of layers, as well as in the way they are attached to each other. The supporting element of any door is a metal base - this is the main layer. All other layers are attached to the base, and it is on the base that the swivel joints are located, through which the door is attached to the furnace body.

Picture 1

Figure 2

Figures 1 and 2 show the microwave oven door that we will disassemble. Figure 1 shows the outer layer of the door in the form of a decorative finish made of white plastic, as well as the outer protective glass. Figure 2 shows the door from the other side, the inside. Here you can see the metal base of the door with a protective mesh, in the form of many holes, and the frame of the plastic seal, framing the entire perimeter of the door. In order to gain access to the fasteners between the layers, it is first necessary to separate the seal frame from the door base. The fastening of these layers to each other is carried out with the help of latches.

Figure 3

Figure 3 shows the seal frame already removed. Pay attention to the nature of the latches, all the latches are turned inside the frame. So, to remove the seal, you will have to deform the plastic in such a way that the latches bend outward. As a tool for this operation, oddly enough, an ordinary kitchen knife with a narrow and durable blade was best suited. The whole difficulty lies in the fact that at first we do not see where the latches are located and how many there are in general. Therefore, prying on the seal frame should start from the side of the crossbar. In this place, it is most often attached not to the base of the door, but to the decorative layer and is separated more easily.

Figure 4

And so, we insert the knife blade into the gap between the seal frame and the outer layer from the side of the crossbar, tilt the knife in the direction, prying the frame from the door. This must be done very carefully, without much effort. If the frame doesn't budge, try moving the blade to one side or the other along the gap and try again. But, as a rule, in this place the seal is separated quite easily. Then we move on to the corners. It doesn't matter what angle you start from. We rearrange the knife to the long side of the door, at the same time, with the fingers of the hand, raise the frame from the side of the crossbar and pry it with a knife along the long side. The corner of the frame should be free. So we continue around the perimeter. With one hand we lift the frame, with the other, with the help of a knife, we hook it. Sometimes, you have to wield a knife from the inside of the seal frame. Again, this must be done very carefully. Particularly noteworthy are the doors of old ovens, in which the plastic has lost its elasticity. In such cases, losing caution, we risk not only breaking the latches, but also the frame itself. Everything, we will assume that we removed the seal.

Next, you should separate the decorative trim from the base of the door. After removing the seal, we got good access to the fasteners between these layers and can already visually examine the presence of mounting screws, determine the number of latches and their location. First, check for screws. In our case, there are no screws, only latches take place. Ras connection of layers, again, it is worth starting from the corner. To do this, we need two screwdrivers with a wide, flat blade. We insert screwdrivers between the base and the decorative layer on both sides not far from the latches, as shown in Figure 5., and bend the plastic outward with them.

Figure 5

Here, with an effort, you can not be shy, within reasonable limits of course. After releasing the two - corner latches (the latches in the figure are indicated by red arrows), one of the screwdrivers should be left in place, otherwise the latches will return to their original position. We move the second screwdriver further along the side on which the first one remains and repeat the action until the next latch is released, and so on around the entire perimeter. Well, the metal base is separated from the decorative trim. At this moment, we have full access to the crossbar, which is fixed on the base and access to the glass, fixed on the decorative layer (Figure 6). In other words, if you dismantled the door in order to wash the glass from the inside or replace the bolt, you can do it now and then proceed with the assembly. And we will go further.

Figure 6

Figure 7

The fastening of glass to the plastic trim is also carried out with the help of latches. The recipe for separating one from the other is the same as before - we start from any angle. It's just not advisable to use any tool here. Glass is a very fragile material and when prying, say with a screwdriver, it can simply crack. We will separate with bare hands. To do this, we take the plastic in our hands, with our thumbs we bend the sides of the trough outward on two sides and at the same time, with the index and middle fingers, we press from below on the glass. In Figure 7, the green arrows indicate the intended places for applying forces to bend the plastic, and the red arrows indicate the location of the latches. As before, after releasing two - corner latches, go to one of the sides and repeat the action around the entire perimeter. And now, plastic separately and glass in our hands (Figure 8). After that, if, say, there was a crack on the glass, and you dismantled the door in order to replace it, you can take measurements, cut out a new one and put it in place. By the way, the installation method is the same - bending the plastic with your hands, only you need to put pressure on the glass from the other side.

Figure 8

Before the complete disassembly of the door, the last thing left is to remove the protective film from the inside of the metal base. In order to do this, it is not at all necessary to disassemble the door, it is enough to remove it and place it horizontally for convenience. This layer is designed to protect the door window mesh from food fragments sticking during cooking and is a thin, transparent, heat-resistant film with an adhesive layer on one side. As you probably already guessed, we will start separating the film from the base from the corner, from any corner. Everything is very simple here, you need to take a blade or a thin knife and pry the film from one corner so that you can grab the raised corner of the film with your fingertips. Then slowly and smoothly pull the film by the corner to the center of the door window. The film is removed very easily, the main thing is not to make sudden movements.

Figure 9

That's all, the door is dismantled, as they say, "to the ground" (Figure 9). Agree, there is nothing complicated in this. "To break is not to build."

Today there is almost every home. It allows you to quickly, easily and conveniently heat or cook food, while maintaining the value of the product. It's a shame and unpleasant if the microwave suddenly starts to malfunction or stops turning on. Of course, the first thing that comes to mind is a trip to a service center or the nearest workshop. If the microwave is under warranty, that's worth doing. But most breakdowns, as practice shows, have fairly simple causes. A person who has certain tools and knows how to use them can try to make simple repairs with his own hands.

Let's try to figure out why this household appliance may not work using the example of a Samsung microwave oven. Do-it-yourself repairs are recommended only after the warranty period has expired. Microwave ovens of the Samsung brand have not only the usual universal functions, but also unique additional features that are unique to this brand. In order to carry out an independent repair of Samsung, you need to know the device and the principle of operation of the microwave oven in principle.

Microwave device

It is better to start any repair of household appliances with an acquaintance with its internal structure. Main functional details:

• Control block;
• magnetron;
• waveguide;
• frame;
• cooking chamber.

Here are some typical malfunctions of such equipment:

• not warm.
• The microwave sparkles inside.
• The microwave oven does not turn on.
• The plate does not rotate.
• The microwave oven heats food slightly.
• The operation of the furnace is accompanied by a strong hum.
• The touch keyboard does not work.
• No indication.

Microwave does not heat

So, your Samsung M1712NR microwave oven is broken. Do-it-yourself repair will begin with disassembly. Unscrew the back cover of the oven. We call the fuses and the thermostat winding with a multimeter. If open circuits are found, the fuses must be replaced. We check the magnetron circuit and the filament. We call the capacitor and its fuse. We find that the latter burned out, which indicates a short circuit, and the resistance of the capacitor is 2 ohms.

Thus, we found out that the failure lies in the capacitor, on which the short circuit occurred. We take it off. We select a new capacitor at a denomination similar to the old one, and replace or restore the capacitor fuse. Checking the oven.

Tip: To protect yourself from microwave radiation, do not turn it on without a lid. Earned? So the repair is over.

Microwave sparks inside

If your appliances break down, then before you repair the Samsung microwave oven with your own hands, do not forget to unplug it from the mains. The first thing you need to pay attention to in case of such a breakdown is the magnetron screen. It is in most cases made of sheet mica. The magnetron screen is located on the side wall inside the microwave. It is made in the form of an overlay and is fastened either with latches or with self-tapping screws.

Under the screen there is a hole through which rays from the magnetron enter the microwave oven. Having removed the plate, we find traces of burnt mica on it. It is for this reason that the oven sparks. The easiest troubleshooting option is to make a new mica sheet screen and install it in place.

In addition, you need to pay attention to the condition of the metal in the place that was covered by the screen. If the microwave worked for a long time with burnt mica, then both the metal and the magnetron cap could burn at the site of damage to the screen. Then you have to remove the protective cover of the microwave, get to the magnetron cap and determine whether it needs to be replaced or not.

Dish not spinning

There is another old microwave oven model - Samsung MW 87 GPR-G. It happens that the plate does not spin in it. This is one of the most common technical malfunctions, which, if desired, can be eliminated by repairing a Samsung microwave oven with your own hands. Most likely, the pallet rotation motor in the oven has broken down, which needs to be replaced.

Place the microwave door upside down. Remove the cover that covers the engine. Disconnect connection pins. We unscrew its fasteners and remove the engine. Having picked up a new engine, open the microwave oven door and look at the position of the drive sleeve. There is a cut-slot on the motor shaft. A bushing is fixed in it. When installing the motor, it is necessary that the spline on the sleeve coincides with the spline on the shaft. Turn the sleeve by hand until it fits on the shaft. We fix the engine, put the terminals and cover in place. Do-it-yourself Samsung microwave oven repair with such a malfunction is quite easy to carry out.

Touch keyboard not working

How to repair a Samsung microwave oven with your own hands if the "Start" button does not work? In this case, it most likely failed. This is due to moisture ingress, the contacts are oxidized, and some of the buttons stop working. In addition, the touchpad wears out over time and needs to be replaced.

Remove the top cover and control box. Disconnect the board. Peel off the touch panel under warm air. We wipe the contacts, install a new board in place. We return the control panel to its place.

Microwave won't turn on

You can repair the microwave oven yourself. Remove the cover, check the integrity of the network cable with a multimeter. Further, with its help, we check the integrity of the fuses in the dialing mode. If we do not detect an open circuit, we continue the test. We call the resistors and the control panel. Next, check the switches on the panel. We find a broken switch element. When the door was closed, this element did not press the button, respectively, the contact did not close, and therefore the microwave did not work. We repair a broken switch, if the quality of the plastic and glue allows it, or we replace the failed element. We collect the oven.

Faced with poor-quality or dishonest service in a repair shop, some consumers are wondering how to repair a Samsung microwave oven with their own hands. Troubleshooting is possible in most cases. To do this, familiarize yourself with the device of the microwave oven and the principle of its operation. Do not forget to take safety measures into account when repairing your own hands.

Security measures

In order to safely repair a Samsung microwave oven by yourself, please take into account the following rules:

• it is forbidden to make holes in the furnace body;
• do not turn on the device with the door open and the case removed;
• remove mounting debris from the waveguide when reinstalling the magnetron;
• use an insulated wire to discharge the magnetron power circuit.

Nowadays, microwave ovens are in almost every home. At the same time, there are a huge number of models on the market. In general, the designs of microwaves are very similar, but there are differences. Thus, each manufacturer has its own weaknesses. In order to start repairing microwaves with your own hands, you need to make a complete diagnosis. As a result, it is necessary to obtain comprehensive information about the breakdown, and only then take any measures.

Microwave repair "Algie"

This company is considered famous. At the same time, she produces a quality product, and it rarely breaks. If we consider specifically microwaves, then most often the problem is a vacuum lamp. This part is called a magnetron. The main duty of the specified element is the creation of radiation. Thanks to this, it is possible to influence the water that is in the food. In this case, it is important to note that magnetrons are produced at different frequencies. In order to check its performance, the part should be removed. Do-it-yourself microwave repair (LG in this case) begins with unscrewing the back cover of the model.

Next you can see a small cap. In some models, it is covered with a casing from above. In such a situation, he is removed first, and then the cap. As a result, you can see the flange, which is located next to the magnets. In many cases, it is directly connected to the radiator. You can finish repairing the microwave oven with your own hands (LG) by removing the flange by unscrewing the magnets. After that, you will see a magnetron that looks like a regular box. It is attached to the microwave body on small latches that need to be turned to the side to open. Thus, the magnetron can be safely removed for replacement.

Magnetron Replacement

Before you start, be sure to de-energize the device. In order to correctly replace the magnetron, first of all, you should familiarize yourself with its modification. As a rule, the marking of this element is located on the sidebar. Before buying a new magnetron, it is best to assess the wear and tear of the device. In this case, you need to look at the condition of the casing.

It is important to check the integrity of the filter that is inside. This can be done only by unscrewing the bolts on the filter itself. The filter itself is a disk of small diameter. If the microwave oven is used improperly, it can be damaged. In this case, it is most advisable to try to replace it, and not the entire magnetron. If, however, the entire mechanism is damaged, to install it, you must remove the back cover of the microwave again. After that, it is important to correctly install the magnetron for fixation. This can be done very simply by looking at the markings. Ultimately, it should be on the right side. In this case, the latches will fall into place, and it will be possible to re-screw the flange. After that, you should do a test run of the unit.

Samsung Microwave Repair

Many models of this company suffer from the circuits that the Samsung microwave has. Do-it-yourself repairs need to be done only after the device is de-energized. It is important to note that such failures most often occur due to voltage drops in the network. To understand this issue, you should familiarize yourself with the structure of the microwave circuit.

It consists of management and executive parts. The first system is presented in the device in the form of a microcontroller. His main job is programming. It is with the help of the microcontroller that the display of the model perceives signals.

It also monitors. Thus, circuit failures are very easy to recognize. In some cases, the microcontroller only partially fails. In this situation, the display is able to display information, but the touch panel will not work. It can also turn out the other way around. All this suggests that the buffer elements of the circuit are violated. In some cases they are called transistors.

Schema replacement

In many models, the circuit is located under the magnetron. In order to start repairing a microwave oven with your own hands ("Samsung"), you need to get to it by removing the back cover of the device. This can be done by simply unscrewing the four nuts. Next, a person will immediately see a diagram that is attached to the sides on the latches. In order to examine the microcontroller completely, it is not necessary to remove it. It is enough just to disconnect it from the circuit.

To do this, you need to rotate the plate 90 degrees clockwise. As a result, the latch will be removed and the microcontroller will be released. First of all, you should inspect this element. To do this, the integrity of the antenna, which is located in the upper part, is checked. Under it there is a winding, which can also suffer with prolonged use of the microwave. If there are dark spots on it, the problem is definitely in the radiator. This is due to the fact that it failed, and as a result was not able to cool this element.

Thus, the temperature during operation rose sharply, and the winding could not stand it. If everything is intact, but the device does not work, the microcontroller connector is checked last. In this case, you need to evaluate the rigidity of its connection with the wire that leads to the circuit. After that, the element is installed in its original place. If the microwave does not work, you should completely change the microcontroller.

How to repair a Panasonic microwave?

In some cases, owners of Panasonic microwave ovens may encounter certain problems with the fan, as well as the magnetron. In the event of a breakdown, a person, as a rule, hears a sound uncharacteristic of the device. Also, a clear sign of a malfunction of the model is an increased glow inside the camera. In this case, sparks may form, and in this case, do-it-yourself microwave repair should begin with replacing the fan.

How to clean the fan?

Starting do-it-yourself microwave repair ("Panasonic"), you need to make sure that the device is de-energized. Fans in many models are mounted near a high-voltage transformer. In order to get to it, you will need to disconnect the capacitor. This can be done by removing the back panel of the microwave. After that, inspect the magnetron, next to which is a high-voltage transformer.

In order to remove it, you will need a standard set of screwdrivers. The lower clamps open without tools. You will need a Phillips screwdriver to remove the top screws. After removing the high voltage transformer, you can see the fan. First of all, its contamination should be assessed. In some cases, it is not able to perform its functions due to accumulated dust. Having completely cleaned the fan blades, you need to reassemble everything and restart the device.

Microwave cooler replacement

If cleaning the fan does not help, do-it-yourself microwave repair can be completed by replacing the cooler. Pick it up at any Panasonic service center. It is important to report the model of the microwave. After that, unscrew the high-voltage transformer again and remove the fan.

In many Panasonic models, it is attached at the corners with screws. After replacing the cooler, it should be scrolled by hand. If nothing interferes with the movement of the blades, you can safely install a high-voltage transformer and screw the back cover of the microwave.

Problems with Daewoo models

In general, Daewoo microwaves are of good quality. However, they have the standard problems with the magnetron. Additionally, high-voltage capacitors can break. In this case, the microwaves refuse to turn on. Among other things, the owner may have certain problems with the door, and this is due to weak fasteners. In this case, you can try to repair the Daewoo microwave oven with your own hands.

Door repair

If the door breaks, the microwave oven, as a rule, does not turn on. This is due to the fact that the door does not fit snugly, as a result, the sensor does not work, and it is impossible. In this case, repairing the microwave door with your own hands should begin by checking the latch. To do this, you must first make a visual inspection.

If the door parts are intact and not damaged, it is necessary to check the latch for contact strength. To do this, you need to take it with your hand and try to loosen it. As a result, it should not deviate. If the part is loose, it should be tightened, and in order to do this, you will need a screwdriver and an awl. First of all, the screws are unscrewed from above and below. Further under the latch is a small spring.

When it loses its rigidity, the door does not adhere well to the microwave. You can check the spring only if you get the part and inspect it. A simple awl will help with this, and the door is hooked from the top edge and pulled down. As a result, the spring should pop out easily.

Hinge replacement

If, after replacing the latch, the problem with the door is not resolved, do-it-yourself microwave repair (Daewoo) may be delayed. First of all, you need to check the loops. To do this, prepare an awl. It is best to start from the top. To check the hinge, pry the central axis of the door up. After that, you can inspect the part as a whole.

If there are no cracks, it is necessary to clean the hole and proceed to inspect the lower element. When there is a deformation of the door, the entire loop will have to be completely changed. You can buy this item at the service center. When replacing the element, it is important not to damage the inner coating of the door and work carefully with an awl.