Surely many were faced with a situation when, when the microwave is turned on, the machine next to the counter turns off. There are a lot of factors that can cause this, from the usual malfunction of an electrical appliance to poor contact in the meter or in the machine itself. We will try to figure out what malfunctions of the microwave oven can cause this, and what methods exist for eliminating this problem.
The most common causes and operation errors
Circuit breakers
Automatic machines signal that there are some malfunctions in the wiring line:
- Perhaps the problem is in the broken power cable of the device, or maybe in the device itself.
- Knocks plugs when connecting, for example, a microwave at the same time as an electric kettle. This indicates, first of all, that the overload that appeared during the synchronous introduction of some home devices was too high.
- Faulty machine, set in the counter.
- Also, you need to change the wiring, especially if it has never changed at all. The insulation on the wires deteriorates over time, probably somewhere there are bare strands that touch each other and begin to shorten.
High voltage capacitor punched
When this element fails, surges in the mains voltage may appear and short from high overload. For these reasons, it may knock out a machine in the counter. There are several symptoms that report this problem:
- products do not heat up;
- the stove emits a sweet aroma of a burned winding or fumes;
- a rumble is heard during her work.
Microwave does not heat food
The conversion devices themselves may differ:
- power;
- dimensions;
- fixtures;
- counter windings.
What to do:
- Discharge capacitor - a screwdriver in the block case or closing the contacts between each other. Since it can cause electric shock, even if there is no network connection.
It’s risky to touch the capacitor immediately after opening the lid, as it holds a charge for a long time and is capable of electric shock.
Microwave device
- Unscrew the screws and remove the cover.
- Carefully remove the terminals from the terminals of the main winding of the transformer.
- On the tester, set a threshold of 0.2 kOhm and determine the readings. If they are less than 2 or more than 4.5 Ohms, then most likely the reasons need to be sought in the main winding.
- Inspect the secondary winding, in this case, the threshold of the device is 2000 Ohms. Remove the terminals from one pin and also analyze the data. If the readings are higher than 0.35 kOhm or less than 0.14 kOhm, then this indicates that there is an inter-turn circuit of the secondary winding.
- Test the filament winding - measurement threshold 0.2 kOhm. Disconnect the terminals and test. Resistance - from 3.5 to 8 ohms.
- To test whether 220 volts are supplied to this section of it. To do this, connect the tester to the terminals that fit on the main winding, start the microwave and turn on the heating program.
Door microswitch on the door
The power supply circuit of the transformer has lock keys. They only close if the microwave door is locked. Door latches short-circuit the contacts and power is supplied to the converter. The first signs that contact sticking happened - the microwave does not turn off and the doors are locked.These parts should be replaced:
- Remove the cover and press the upper latch.
- Remove the plastic insert located on the inside of the door.
- Replace.
Microwave door latches
If the fuse blows when the door is opened or closed, it means that the microswitches are not synchronized. Their service should be adjusted so that when the door is opened, the main one is disconnected, and then the safety switch closes.
Magnetron Internal Circuit
In inverter microwave ovens, the designers introduced a negative magnetron electrode. In order to make sure that the magnetron is not really functioning:
- Put water in the oven.
- Turn on for a minute and a half and listen carefully.
- If a sound is heard that is interrupted, then this indicates that the cathode emission at the magnetron has ended and electrons have emitted.
- He himself practically does not heat up and, accordingly, the water will also be cool.
- If this component of the system breaks down, then it should be replaced:
- Unscrew the magnetron - discharge the heat exchanger, remove the power supply, unscrew the air duct from it so that it does not interfere, and unscrew the bolts.
- Install another with bolts. The waveguide system is so organized that it is possible to catch on the edges with both washers and hooks. When changing individual types of magnetrons, it is possible to drill holes for self-tapping screws directly in the waveguide, if the holes do not match. The main thing here is that ventilation is respected and oriented correctly
- Replace the duct.
- Check its operation - install water, turn it on and listen. At the beginning of work, he may crack a little. Water should be warm and magnetron too.
Be especially careful not to leave debris in the waveguide when changing. Litter will cause a disorder of microwave waves in the waveguide, as a result of which the stove will emit radioactive waves.
Blown fuse
In an emergency, the fuse blows, protecting the generator. This switching device is a fragile product that is easy to spoil and is hidden in a plastic case. It is made in the form of a not very large glass cylinder, inside of which there is a spring with a thin combustible wire. If there are problems with the power supply of the wires, this part warms up and if the power does not come back to normal for a very long time, the wires are soldered.
Microwave fuse
If there is a problem with this component, then it is usually visible visually - the wire is loose. However, there are episodes when the contact is broken, but this is not visible visually. Therefore, it is more correct to take a multimeter and ring the fuse or examine it for a break, measuring the reaction.
If the microwave oven does not turn on directly due to a blown fuse, it must be changed. Everything is simple here - the fuse is easily removed from its place and a new one is inserted. Also, it is possible to recover. To do this, carefully remove the steel cap from the side where the spiral was soldered off, and solder it into place using a soldering iron.
Protection and safety
Protective relays are responsible for synchronous shutdown of absolutely all modes when the door is opened at the moment magnetron operation. Two of them, as a rule, break the power circuit on the ground or in the phase, but in addition to this, one necessarily monitors the working capacity of the second. There is a third safety relay that opens the power contacts when the door is open and the start button for the heating process is not turned on.
The high power consumption of this appliance is considered a high hazard. A network with an earth cable will significantly protect against electric shock. In the absence of grounding, in no case do not touch the housing and pipes at the same time. This may cause a short circuit.
Grounding through communication pipes is prohibited. This can cause permanent damage.
In order to protect the child, a microwave oven lock is provided.
Much depends on the proper care and prompt elimination of the resulting malfunctions.
Repairing microwave ovens is not safe because significant voltage is involved. But even with many services, many people prefer to make repairs themselves. For this reason, repair may require an immediate call from a specialist. A professional craftsman will be able to accurately detect the root cause of the malfunction and immediately eliminate it. With the timely elimination of deficiencies and the reasonable operation of the microwave, it will work stably for a long time.
