How to check a capacitor in a microwave

Capacitors in a microwave oven serve to equalize voltage surges that occur in the network during operation. This is very important for the proper functioning of the microwave.

The capacitor consists of two insulated conductors that are placed in a metal case. During switching on, they interact in the circuit. Thanks to this, electricity is accumulated.

At a time when the voltage that the unit receives from the electrical network may not be enough to operate the furnace, the energy accumulated during operation is released. This prevents sudden increases in voltage.

Parts vary based on maximum energy storage capacity.

The type of capacitor used in the device depends on the microwave oven itself, its power and design.

Capacitor check

If you have a need to check the serviceability of this element in a microwave oven, you need to approach this matter responsibly. This will prevent damage to other electronics located in the microwave.

Typically, testing is carried out when a malfunction is identified or when there are other failures in the correct operation of the microwave.

Below are instructions on how to perform the test correctly and which device is best to do it with.

How to find a capacitor in a microwave

• When working with a capacitor there is a possibility of interaction with high voltage and this can be very dangerous. In order to protect yourself from the possible negative effects of current, You must first unplug the microwave oven.
• After unscrewing the back cover of the device, you must remove the cover panel.
  Depending on the design of the furnace, it will not be difficult to find the capacitor; it is enough to know approximately what it looks like. Usually the part is located near the transformer.
• Regardless of how long the device has been without power, it is necessary be sure to discharge detail.

Important. A capacitor has the ability to store electricity. To avoid getting an electric shock even after turning off the stove, it is necessary to release the accumulated energy.

Only after the above operation can you start working with it.

Using a Multimeter to Test

For diagnostics you will need a special device - a multimeter. Its functions include testing various electrical devices or individual parts.

To check with a multimeter The device is set to ohmmeter mode. The multimeter prepared for use is connected to the capacitor.

IMPORTANT: For correct measurement it is necessary to set the maximum possible limit on the device.

The limit depends on the type of device, so it is different for everyone.

After the first reading of the readings, it is necessary to rearrange the probes and monitor the dynamics of changes in the result, displayed on the device.

However, verification by this method occurs at a low rate.Usually, at this voltage, in high-voltage capacitors, if they have a leak or are broken by a short circuit, the breakdown is not detected.

In order to avoid such inaccuracies, you can use a megohmmeter with an external high voltage source equal to the operating value of the capacitor.

Among the main megohmmeter models suitable for such a test are the following:

• PU182.1 (500 V);
• PU186 (2500 V);
• KEW-3125 (5000 V).

Signs of a working and faulty capacitor

Initially, signs of problems may include various power outages during operation of the microwave, as well as a short circuit.

When checking with a multimeter, based on the readings on the display during contact of the probes, you can determine how well the capacitor is working and whether there are problems with it.

• If during the test the display shows number one and the indicators do not change - this means that a break occurred in him and his you can safely throw it away. Such parts are considered defective.
• If the display shows constant slight resistance, it means there is a leak, The leaking capacitor also needs to be replaced.
• If the device shows zero resistance and data will not grow, That The capacitor is broken, that is, there is a short circuit in it.
• Finally, if upon contact of the probes the resistance indicator is minimal, but then gradually increases, until the multimeter displays a unit, this means that the capacitor is OK. It can be easily used at work.

Thus, knowing all the above nuances when using a multimeter, you can easily determine whether the part is working or needs to be replaced.

Timely checking of such critical parts of the microwave oven will help keep it in good condition longer.

By following all the rules, procedures, and also having a little knowledge in electrical engineering, identifying the problem and eliminating it will not be difficult.