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Repair of microwave ovens with their own hands

Many of us have forgotten about the different plates, hobs and complete trust in the process of cooking microwave ovens microwave. And it is not surprising: microwave occupy little space, They have a wide range of different functions and saves time. Naturally, we are very disappointed, when our microwave oven fails. The causes of breakdowns and failures can be different. Consider, that breaks down in the microwave oven more often. Often with damage to the microwave you must turn to specialized master. It's not the easiest device, so the repair is rather complicated. But in fact, the microwave design elementary and includes only a few basic elements. If pre-acquainted with frequent breakdowns, the repair of the microwave yourself is not difficult.

The design of microwave ovens

Although the microwave oven construction comprising a mass of elements, most of them does not play a functional role. To repair this device need to know only the basic elements of the scheme, providing her work. Among them:

  1. magnetron.
  2. Transformer.
  3. High-voltage fuses.
  4. rectifier diode.
  5. Capacitor.
  6. Control block.

microwave circuit
An arrangement of elements in the microwave

Distinguish them easily, because the exterior design is not characterized by high complexity. The magnetron is always set in the middle, directed to food heating unit. The transformer is located under it, representing a massive box with protruding coil. Capacitor, a diode and a fuse located right of, and the control unit is often located near the Input Panel.

When the voltage of the device in 220 In enters the transformer. Passing the primary and secondary windings, the output of the element is already in progress in the current 2 KB. Further, the negative half-wave diode goes on, and positive charges the capacitor, which again leads to a twofold increase in voltage. After that begins the generation of microwaves by the magnetron. The power control unit adjusts the magnetron.

Therefore, in case of breakage you should pay attention to these elements. They carry the greatest load, so often the problem occurs in them.

When disassembling a microwave be sure to disconnect it from the mains.

failure Search

Search breakage in a microwave oven is based on the "symptoms". This allows you to gradually eliminate the possible causes and find true. so, if the oven is not switched on, you should check the following points:

  • The integrity of the power cord.
  • The position of the door and its closing system.
  • The state of the mains fuse and thermostat.

In the first case, the situation is elementary - no power because power cord damage. A similar situation happens in case of damage or overload sockets. In this case, it suffices to replace the element, with the microwave is all right.

Next it's worth checking the work and position of the door. The fact, that work microwave oven with the door open is dangerous for the surrounding. Therefore designed to operate only when it is fully closed. If the latch on the door was broken, locking element or inspection system, the security system will not start the device.

Recent times also relate protective furnace systems. The fuse prevents damage to the device due to voltage surges, and thermostat provides a complete system shut down when the door is open. Both can be damaged, replace them is quite simple.

It is also worth checking the mains voltage and the number of connected devices in the socket. Microwave is very demanding to nutrition, therefore slight variations can cause problems with the device.

the problem of microwave
Procedure if there is no heating
failure microwave
fuse malfunctions


Most models suffer from common problems and have similar, common Problems. for example, if the microwave oven works, but not warm, this indicates a malfunction of the capacitor, diode or magnetron. To self-repair the microwave oven, you will need a simple set of tools: pliers, nippers, otvёrtka, adjustable spanner and wrench on five, and soldering thereto the necessary inventory.

With self microwave microwave repairs should be aware of the security measures. Two of the main factors represent a hazard when repairing this high voltage microwave furnace and microwaves nodes. You can not include it if faulty door lock or the damaged meshes in the viewing window. You can not make their own holes in the body and enter whatever was conductive objects in the components and furnace elements. In no case do not touch the internal parts and assemblies during the microwave. Be sure to use a tester or other electrical devices for measuring the AC and DC.

Disassembly microwave independently

If the above reasons do not confirmed, it is necessary to disassemble the device for troubleshooting. Prior to this, be sure to turn off the oven from the power supply and wait a couple of minutes.


What to look when searching for breakdowns? There are some basic elements, often coming from the building:

  1. Circuit breakers.
  2. Capacitor.
  3. Diode.
  4. Transformer.
  5. magnetron.
Photo capacitor microwave

These elements are directly involved in the operation of the device and the previously mentioned. First you need to check the fuses. Their breakdown shows Immediately, because when burned wire inside is destroyed. If this did not happen, you should seek further.

To further test must take a multimeter, because apparently find damage to the rest of the details are extremely difficult. To check the capacitor need to switch to the ohmmeter mode, then connect to the details. If there is no resistance, the item must be replaced.

The high-voltage diode
The high-voltage diode

The high-voltage diode is impossible to check the tester. It is recommended to replace it in case of breakage of other parts, because often hit and falls on it. His test can be done a little bit different way - by connecting to the network on the way to the light bulb. If the lamp lights up weakly or flashes, This item is correct. If it is brightly lit or does not turn on, the diode should be replaced.

Further verification is carried out the transformer.

Photos transformer microwave
Photos transformer microwave

It is important to observe safety precautions, after all

microwave magnetron
Photo magnetron microwave

this element is able to hold a charge for a long time. It takes a few minutes to discharge serviceable transformer, and for failure to discharge the resistor - much longer. It should relieve him of the case or do not touch, if there is no experience with similar equipment.

Further verification is carried out the transformer windings. It is necessary to remove the terminals and turn the device to check the ohmmeter terminals. Checked first primary winding, for which the rate varies from 2 to 4,5 ohm. For outside of the secondary winding are 140 and 350 ohm. Also worth checking filament winding, Connect terminal, leading to the magnetron, to the multimeter. It varies from the norm here 3,5 to 8 ohm.

All previous tests have failed, the problem may be in the magnetron.

To check the magnetron is sufficient to connect the tester to its power terminals. Tester switches to the ohmmeter mode. If the resistance is equal to 2-3 Omam, it means damage or injury. The same situation, if the tester means forever. In both cases, the device must be replaced.

These elements - most frequent breakage microwave culprits. Often, however, the output device of the system is linked to other malfunctions such as problems with the electronic control unit, timer and other electronic components. Here is a simple test will not help by the meter, require assistance of a qualified master. Although much easier to simply replace the item, if you are sure of its failure.

The destruction of the cap on the magnetron

Frequent cases of failure, associated with the destruction of the cap on the magnetron. The thin aluminum body simply can not withstand loads and breaks down under the influence of microwaves. This problem often occurs in older devices, greater than several years age. Obvious symptoms in this case, is noise and sparks during operation.kolpak microwave

To check enough to remove the transformer, because the cap is disposed toward the food chamber. If the cap is destroyed, i.e 2 options:

  • Replacing the cap.
  • coup cap.

The first option is priority, order enough replacement or give a magnetron for repairs. A second alternative embodiment is considered temporary, allowing to extend the life of the device indefinitely. Suffice it to scroll through the cap on 180 degrees about axis, because the load is only one-half.

Repair of microwave fault yourself

Repair of microwave ovens is a feasible task for the novice electrician. If the problem is the failure of one of the constituent elements of the furnace, the simplest and most correct decision - to be replaced. The bottom line is, that most of the parts of the device can not be repaired, and a complete replacement of the new. This applies particularly to fuses, diodes and capacitors - the main cause failure of the device.

Replacing parts is carried out in several steps:

  1. Microwave oven is disconnected from the network.
  2. Discharging occurs transformer (5 minutes).
  3. Of defective parts are disconnected terminals, it is removed.
  4. Connects serviceable item at the same place.

When replacing parts must take into account two important factors. The first of them - a schema. Important to remember, that every detail has its own characteristics, selected for efficiency all circuitry. If after changing this nuance is not considered, it leads to new breakdowns. This is particularly true of the transformer and a capacitor.

The second important factor - the connection details. You must connect the correct replacement, retaining the original location of terminals. If you connect the device in the reverse order, it may disable it, as well as several other parts in the system.

This will restore your microwave in most cases. If the failure is related to the electronic part of the device, it is necessary to turn to professionals. This will ensure a quality repair and extend the device work in the long term.

Burnout protective mica

The most common failure is the failure of the waveguide cap in the microwave chamber. The reason for this becomes splashes of cooking. From this it begins arcing between the antenna of the magnetron and a protective cover. Untimely removal of burnt products leads to a local burn-out cover and the complete destruction.

Local burnout mica cover plate can be removed using an alcohol or a solvent 646. Suffice it to gently rub the spot burnout.

burnout mica

If the mica cover plate is in an obviously poor condition, zazhirena be painted or become, then it should be replaced. Remove the plate-lens is a snap. This can be done using a standard sharpened knife. Typically mica plate mounted on the screws or rivets. Carefully we place the old plate for the new template and cut out the new. It is best to do it with a knife - scissors can dislocate mica. Openings in the new record Do the acute and screwdriver handle plate edge fields sandpaper. The new plate is set on the place of the old.

Often the question arises, than replace mica for microwave? For this purpose, any suitable insulator with a similar characteristic of the dielectric constant. for example, ftoroplast or teflon.

other faults

Widespread breakdowns in a microwave oven are also fault associated with other elements of the furnace. for example, such, furnace as a keyboard control unit, the electronic control unit and a microwave dissector. Less often fail transformer and high voltage capacitor, microwave waveguide and a rotating pan plug. Subject to wear and power source magnetron microwave.

Knowing troubleshooting in a microwave oven, you will significantly save on repairs. However, if you do not know, how to repair the microwave, it is best to consult a specialist. Repair microwave microwave to help qualified service staff. In addition, watch the video to repair the microwave, perhaps there is precisely the failure of which will help to repair your favorite domestic helper.

Video Repair microwave


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