What is connected to the high voltage transformer and capacitor in the microwave oven, is it safe?

The hose is filled with a high-pressure fuse.

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1.Detection and judgment of non-power-on situation: use a fat meter to measure the resistance value.

The resistance of the primary ends is 2 ohms, and the resistance of the secondary filament is close to that of a short circuit. The resistance of the high-voltage winding is 80 120 ohms. There are obvious differences between different transformers.

2.Power-on detection judgment: connect the primary to the 220V AC mains to see if the secondary voltage is within the range.

The filament is about 4v, the high voltage is 2000v, and the 2000v here is not easy to measure. Common multimeters do not measure voltages this high. It may be preliminarily judged by drawing an arc.

It takes experience. It can also be judged by measuring the no-load current current. The microwave oven transformer controls the current of about 4A.

Check when the microwave is not working. First, disconnect the connection of the transformer and measure the resistance of the multimeter. The primary winding is about 130 ohms, and the high-voltage winding is about 130 ohms, which is normal.

If one end of the high-voltage winding is grounded, the resistance of the high-voltage winding should be measured, and a meter pen should be connected to the bottom plate; The other table is connected to the wire of the high-voltage diode. The filament winding is too thick and too short, it is difficult to measure, and it is not often broken. High-voltage transformers are valuable components as well as vulnerable components.

It is very likely to occur: leakage of high-voltage lines, short circuits, burnouts. We also found in the repair that the primary wire is actually made of aluminum-clad wire, and the welding point with the insert often has poor contact problems.

1. The measuring instrument should be set at the highest resistance range; 2 Normal phenomenon: a test the two terminals of the capacitor, in a short time (real jump) show that the conduction is on, and then the resistance after charging is about 10m; b. The resistance of the terminal and the housing should be infinite; 3 Abnormal phenomenon: a short-circuit capacitor is always on; b Open circuit capacitors always show a resistance value of about 10m due to their internal resistance of 10m; c When the internal wiring in a high-voltage capacitor is open, an infinity resistance is displayed.

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The lower left corner is the wiring electrical diagram, some transformer secondary coils are leads (S0 is directly nailed to the transformer core), the terminal structure in the figure is the same, the lead of the filament coil is generally red, red and black, red and white silicone wire, and a wire diameter core inside.

Extended Materials. The role of capacitors:

1. Coupling: The capacitance used in the coupling circuit is called the coupling capacitor, and the capacitance circuit is widely used in the resistor-capacitance coupling amplifier and other capacitive coupling circuits to play the role of blocking the DC flow and AC.

2. Filtering: The capacitor used in the filter circuit is called the filter capacitor, which is used in the power supply filter and various filter circuits, and the filter capacitor removes the signal in a certain frequency band from the total signal.

3. Decoupling: The capacitor used in the decoupling circuit is called the decoupling capacitor, which is used in the DC voltage supply circuit of the multi-stage amplifier, and the decoupling capacitor eliminates the harmful low-frequency cross-connection between each stage of the amplifier.

4. High-frequency vibration cancellation: The capacitor used in the high-frequency vibration cancellation circuit is called the high-frequency vibration cancellation capacitor, in the audio negative feedback amplifier, in order to eliminate the high-frequency self-excitation that may occur in the vibration cancellation, this capacitive circuit is used to eliminate the high-frequency acoustic noise that may occur in the amplifier.

5. Resonance: The capacitor used in the LC resonant circuit is called the resonant capacitor, and the capacitor circuit is required in the LC parallel and series resonant circuit.

6. Bypass: The capacitor used in the bypass circuit is called bypass capacitor, if the signal of a certain frequency band needs to be removed from the signal in the circuit, the bypass capacitor circuit can be used, according to the different frequencies of the removed signal, there are full-frequency domain (all AC signals) bypass capacitor circuit and high-frequency bypass capacitor circuit.

7. Neutralization: The capacitor used in the neutralization circuit is called the neutralization capacitor. In radio and mid-frequency amplifiers, television high-frequency amplifiers, this neutralizing capacitor circuit is used to eliminate self-oscillation.

8. Timing: The capacitor used in the timing circuit is called the timing capacitor. A timing capacitor circuit is used in a circuit that needs to be charged and discharged by capacitor for time control, and the capacitor plays a role in controlling the magnitude of the time constant.

9. Integration: The capacitor used in the integration circuit is called the integration capacitance. In the synchronous separation circuit of electric potential field sweeping, this integrated capacitance circuit can be used to remove the field synchronization signal from the field composite synchronization signal.

10. Differential: The capacitor used in differential circuits is called differential capacitance. In order to obtain the cusp trigger signal in the flip-flop circuit, this differential capacitive circuit is used to obtain the cusp pulse trigger signal from various types (mainly rectangular pulses) signals.

11. Compensation: The capacitor used in the compensation circuit is called the compensation capacitor, and in the bass compensation circuit of the card base, this low-frequency compensation capacitor circuit is used to improve the low-frequency signal in the playback signal, in addition, there is also a high-frequency compensation capacitance circuit.

12. Bootstrapping: The capacitor used in the bootstrap circuit is called bootstrap capacitor, and the commonly used OTL power amplifier output stage circuit adopts this bootstrap capacitor circuit to increase the positive half-cycle amplitude of the signal in a small amount through positive feedback.

13. Frequency division: The capacitor in the frequency division circuit is called frequency division electricity.

Summary. Hello, if you can repair it to the electrician, don't risk connecting it yourself, sometimes the connection is right, but the skin is not wrapped well, and the wire will be burned.

How to wire microwave oven high-voltage capacitors?

Hello, if you can repair it to the electrician, don't risk connecting it yourself, sometimes the connection is right, but the skin is not wrapped well, and the wire will be burned.

Did you know or not?

Nonsense, why do you ask an electrician to fix it?

The microwave oven transformer is a common core of high and low voltage, the high voltage is generally 2100V, the low voltage is, and the secondary has three heads. Low voltage, high voltage and neutral line (shell). The high-voltage 2100V is converted into 4200V direct current through series capacitance and voltage doubling rectification, and the magnetron is supplied with 2450MHz microwaves.

Low pressure to the magnetron filament.

We know, but we don't advise you to do it yourself, it's dangerous.

I'm asking about capacitors? Not a transformer?

The negative pole of the high-voltage diode is connected to the microwave oven housing, and the positive pole is connected to one of the terminals of the capacitor.

Is it any terminal?

Well. There are four interfaces on the capacitor, and there are three connectors, how to connect them in order?

The shell is connected first. There is no order for the terminals inside.

<>1.Because friction does work, friction generates heat.

2.First the gravitational potential energy is converted into kinetic energy, and then from the kinetic energy is converted into internal energy.

3.When an object slides down at a uniform speed from the top of an inclined plane (indicating friction), the mechanical energy of the object decreases, and the reduced mechanical energy is converted into internal energy, and some of these increased internal energy is the object's and the other part is the inclined plane, that is, the sum of the object's mechanical energy and the total internal energy is constant. Then, of course, the sum of the mechanical energy of the object and the internal energy of the object decreases, because part of the increased internal energy is given to the inclined plane.

Microwave ovens, if the high-voltage capacitor is broken, the fuse will be burned first. 1.The high-voltage capacitor is damaged, mostly due to short circuit, resulting in burn fuse (high, low, and voltage fuses may be damaged).

2.The insurance burns, naturally there is no output, and it cannot be heated. 3.

The low-voltage fuse burns, the indicator light will not turn on, the turntable will not rotate, the cooling fan inside will not rotate, and the agitator will not rotate. 4.The low-voltage fuse is normal, the high-voltage fuse burns, the indicator light will be on, and the turntable will also rotate, but there is no output and no heating.

5.The output of the microwave tube depends on whether the high-voltage part is normal or not. 6.

The light is on, indicating that the low-voltage part of the fuse is good, but the high-voltage part is faulty. 7.When the high-voltage fuse blows.

The microwave oven light is on and not heated, and the reason for the blowing of the high-voltage fuse should also be checked: 8According to the circuit diagram, check the high and low voltage fuses first, and then check the high voltage capacitor C, high voltage diode D, and magnetron.

9.In general, the high-voltage fuse is prone to damage, followed by the high-voltage capacitor C, which is prone to breakage....... 10.

Microwave oven circuits from different manufacturers will be different and should be treated differently.

High-voltage capacitors are critical and important components. If it is broken, it cannot be heated, or it is tripped by short circuit. If the capacitor is still like this, it is not a capacitor problem, but a problem with the power supply or other parts or parts.

In this case, it is necessary to find the cause of the capacitor damage in order to solve the problem at the source. It is recommended to have a professional maintenance personnel to inspect the repair. FYI.

The microwave oven high-voltage capacitor is easy to what will happen if it is broken, the high-voltage flashlight of the microwave oven is broken, which will definitely not work, or cook rice, or cause a short circuit or cook undercooked rice, or heat and cool at the same time.

If the voltage capacitor burns out, you should think that the voltage at home is unstable, and the voltage at home is generally unstable, this phenomenon will occur, you can see if the lights at home are flickering, and you can replace the air switch at home.

If the high-voltage capacitor is damaged, a multimeter should be used to inspect and measure various components of the high-voltage circuit, such as transformers, magnetrons, high-voltage diodes, and door switches.

There is no problem with all the components, and then the fuse is replaced and the machine is energized and tested.

The shell of the capacitor must be reliably connected with the microwave oven casing, the casing must be reliably connected with the ground wire of the power cord, the ground wire end of the power cord plug must be reliably connected with the ground wire in the socket, and the ground wire in the socket must be reliably connected with the ground wire of the power supply system; There are 2 terminal blocks on the capacitor, one end is connected to the high-voltage output of the high-voltage transformer, and the other end is connected to the high-voltage input of the magnetron. Detection and judgment of non-energizing: the resistance value is measured with a fat meter, the resistance value at both ends of the primary is 2 ohms, the resistance value of the secondary filament is close to short circuit, and the resistance value of the high-voltage winding is 80 120 ohms, and the difference between different transformers is obvious.

Detect whether the capacitor is good or bad:

1. The measuring instrument should be set at the highest resistance range;

2 Normal Phenomena:

a Test the two terminals of the capacitor, show that the conduction is on in a short period of time (real jump), and then the resistance after charging is about 10m.

b. The resistance of the terminal and the housing should be infinite;

3 Anomalies:

a Short-circuit capacitors are always on.

b Open circuit capacitors always show a resistance value of about 10m due to their internal resistance of 10m;

c When the wiring of the internal balance line in the high-voltage capacitor is open, an infinite number of resistors is displayed. <>