Microwave repair by own hands( video)

Often, when a microwave breaks down, you should contact a specialized technician. After all, this is not the simplest device, so the repair is quite complicated. But in fact, the design of the microwave oven is elementary and includes only a few basic elements. If you first familiarize yourself with frequent breakdowns, then repairing the microwave oven yourself will not be difficult.

Microwave design

Although the design of the microwave oven contains a lot of elements, most of them do not play a particularly functional role. To repair this device you need to know only the basic elements of the circuit, ensuring its operation. Among them:

• Magnetron
• Transformer
• High-voltage fuse
• Rectifying diode
• Condenser
• Control unit

It's easy to distinguish them, because the exterior design is not very complicated. The magnetron is always installed in the middle, directed to the food warming unit. The transformer is located below it, representing a massive box with a protruding coil. The capacitor, diode and fuse are located to the right of it, and the control unit is often located near the input panel.

When the device is turned on, the voltage of 220 V goes to the transformer. Passing the primary and secondary windings, at the output of the element is already a current of 2 kV.Then the negative half-wave goes to the diode, and the positive one charges the capacitor, which again leads to a two-fold increase in voltage. After that, the generation of microwaves begins with the magnetron. The power of the magnetron is regulated by the control unit.

Therefore, in case of breakage, it is worth paying attention to these elements. They carry the greatest load, so often the problem arises in them.

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

Finding a breakdown

Finding a breakdown in the microwave oven is done on the basis of "symptoms".This allows you to gradually exclude possible causes and find the real one. So, if the oven does not turn on at all, then you should check the following:

• Power cord integrity
• Door position and closing system
• Mains fuse and thermal relay condition

In the first case, the situation is elementary - there is no power supply due to a damaged power cord. A similar situation occurs when the socket is damaged or overloaded. In this case, it is enough to replace this element, with the microwave itself everything is in order.

Further it is necessary to check up work and position of a door. The fact is that the operation of the microwave oven with the door open is dangerous to others. Therefore, the design provides the ability to work only when it is completely closed. If a latch, a locking system or an inspection element is broken on the door, the protection system will not start the device.

The last moments also concern the protective systems of the furnace. The fuse prevents the device from breaking due to power surges, and the thermostat ensures complete shutdown of the system when the door is open. Both can fail, replacing them is fairly simple.

It is also worth checking the voltage in the network and the number of connected devices in the socket. The microwave oven is very demanding for power, therefore its small deviations can interfere with the operation of the device.

Dismantling the microwave oven yourself

If the above reasons are not confirmed, then you need to disassemble the device for troubleshooting. Before this, it is necessary to turn off the oven from the mains and wait a couple of minutes.

What should I look for when searching for breakdowns? There are several basic elements that often go out of order:

• Fuses
• Condenser
• Diode
• Transformer
• Magnetron

These elements are directly involved in the operation of the device and were mentioned earlier. First you need to check the serviceability of the fuses. Their breakdown can be seen right away, because during the combustion the conductor inside is destroyed. If this did not happen, then it is worth looking further.

For further verification, it is necessary to take a multimeter, because it is extremely difficult to outwardly find a breakdown on the remaining details. To test the capacitor, switch the device to the ohmmeter mode, then connect it to the part. If there is no resistance, the part must be replaced.

High-voltage diode can not be checked by the tester. It is recommended to replace it with the breakdown of other parts, because often a blow is necessary and for him. It can be checked by a slightly different method - by connecting to the network on the way to the light bulb. If the light is weak or flashing, the part is OK.If it is brightly lit or does not turn on at all, then the diode must be replaced.

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The transformer is then checked.

It is important to observe the safety precautions, after all

this element is able to keep the charge for a long time. It takes a few minutes to discharge a working transformer, and if the discharging resistor breaks down, it takes much longer. It is necessary to defuse it about the case or not touch at all, if there is no experience with such equipment.

Then the windings of the transformer are inspected. It is necessary to remove the terminals and alternately check the device terminals with an ohmmeter. First, the primary winding is checked, for which the norm varies from 2 to 4.5 ohms. For the secondary winding, the limits are 140 and 350 ohms. It is also worthwhile to check the filament winding by connecting the terminals leading to the magnetron to the multimeter. The norm here varies from 3.5 to 8 ohms.

All previous tests did not work, then the problem may be in the magnetron.

To test the magnetron, simply connect the tester to its power terminals. The tester switches to the ohmmeter mode. If the resistance is equal to 2-3 Ohms, then this means a breakdown of the device. The same situation, if the tester is infinity. In both cases, the device must be replaced.

The listed elements are the most frequent culprits for the breakdown of a microwave oven. However, the failure of the device is often associated with other problems, such as problems with the electronic control unit, the timer and other electronic components. Here simple checks by means of the multimeter will not help, the help of the qualified master is necessary. Although it is much easier to simply replace the part, if you are sure of its failure.

The destruction of the cap on the magnetron

Cases of breakage associated with the destruction of the cap on the magnetron are not uncommon. The thin aluminum case simply does not withstand the loads and is destroyed by the action of microwave waves. Such a problem is often found in older devices, the age of which exceeds several years. Explicit symptoms in this case are noise and sparks during the operation of the device.

To check it is enough to remove the transformer, because the cap is located towards the food chamber. If the cap is destroyed, then there are 2 options:

• Replacing the cap
• Turning the cap

The first option is the priority, just order a replacement or give the magnetron for repair. The second option is considered a temporary alternative, allowing to extend the life of the device for an indefinite period. It is enough just to scroll the cap 180 degrees around the axis, because the load is only one half.

Repair of malfunctions of microwave oven yourself

Microwave repair is a feasible task for a novice electrician. If the problem is the failure of one of the constituent elements of the furnace, then the most simple and correct solution is its replacement. The bottom line is that most of the details of this device can not be repaired, but only a complete replacement for a new one. Especially this applies to fuses, diodes and capacitors - the main reasons for the failure of the device.

The parts are replaced in several steps:

1. The microwave oven is disconnected from the mains.
2. The transformer is discharged( 5 minutes).
3. The terminals are detached from the defective part, it is removed.
4. Connect a workable part to the same place.

Two important factors need to be considered when replacing a part. The first of them is compliance with the scheme. It is important to remember that each part has its own characteristics, selected for the operation of the entire electrical circuit. If after the replacement this nuance is not taken into account, then this leads to new breakdowns. This is especially true for the transformer and capacitor.

The second important factor is the connection of the part. It is necessary to connect the replacement correctly, retaining the old terminal arrangement. If you connect the device in reverse order, it can disable it, as well as several other parts in the system.

This will restore your microwave oven in most cases. If the breakdown is related to the electronic part of the device, then it is worth to contact the professionals. This will ensure quality repairs and prolong the work of the device for a long time.

Video for repairing microwave

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