Plug in the microwave oven to burst the fuse, and the microwave oven will send power normally but th

After the power is on, the fuse in the machine blows out again. From this, it can be judged that the high-voltage circuit system is normal, and the fault occurs in the transformer itself or in the power control circuit. You can unplug the plug-in at one end of the primary circuit of the transformer, if the fan and tray are running normally after power-on, it means that the transformer is damaged.

The cause of the fault may be a short circuit between turns of the transformer winding, which can be eliminated by replacing the transformer fault. If the fuse in the motor is still blown after unplugging the primary circuit of the transformer, the fault must have occurred in the power control system. The cause of the failure can be a damaged interlock switch, a monitoring switch, a serious leakage or even a short circuit in the power line or wire.

With a simple inspection of these components, faults can be identified, and once the components have been eliminated or replaced, the microwave oven can be restored to normal operation.

Check to see if there is a problem with the socket at home.

The microwave oven has normal power transmission, but the fuse will burst when it is heated, and the microwave oven will often encounter the fault of burning the fuse immediately after turning on the microwave oven in the process of use. In fact, blown fuses are one of the more common faults in microwave ovens, usually caused by short circuits. The working circuit of the microwave oven includes two parts: the primary stage and the secondary stage, and the failure of any part of the microwave oven will affect the normal operation of the microwave oven.

During maintenance, the fault position is generally analyzed and judged by the primary and secondary transformer as the boundary. 1. First disconnect the secondary high-voltage circuit of the high-voltage transformer, that is, the plug of the secondary high-voltage end of the transformer (unplug the connection point with the high-voltage capacitor). 2. Replace the fuse with the original specification (generally 6 10A) and then power on.

If the fan and turntable motor are running normally, it means that the power control system and transformer are normal, and the fault is in the high-voltage circuit system. A common fault is the breakdown of the high-voltage capacitor, which causes the secondary high-voltage winding of the transformer to short-circuit directly through the diode, and the current is too large and the in-machine fuse is burned. 3. After the power is on, the fuse in the machine is blown immediately, and the high-voltage circuit can be judged to be normal, and the fault is in the transformer itself or the power control circuit.

4. The simple parameters of various components are as follows, which are used as a reference for the maintenance of the silver shouna. The magnetron filament resistance is less than 1, and the filament voltage is 32V; The primary level of the high-voltage transformer is 220V, and the winding resistance is not 2 3. Secondary high-voltage winding voltage 2000V, winding resistance 80 100; Filament winding 32 34V, winding resistance within 1; The winding resistance of the turntable motor is 10 20k, and the winding resistance of the fan motor is 200 300.

1. Caused by the failure of the power control circuit of the microwave oven or the failure of the transformer.

1) At this time, you can unplug the plug-in at one end of the primary circuit of the transformer, and then if the fan and tray are running normally after power-on, it means that the transformer is caused by damage, which may be a short circuit between the turns of the transformer winding, and the fault of the transformer can be eliminated by replacing the transformer.

2) If the fuse in the machine still blows after unplugging the plug-in of the transformer's primary circuit, it means that the fault problem occurs in the power control system.

This fault can be caused by damage to the interlock switch, monitoring switch, severe leakage or even short circuit of the power cord or wire. With a simple inspection of these components, faults can be identified, and after the components are eliminated or replaced, the microwave oven can be restored to normal operation.

2. The new fuse is not a matching model, or the microwave oven voltage is unstable.

When the fuse of the microwave oven is not the specified model or the voltage of the microwave oven is unstable, it will cause the self-fuse protection of the microwave oven to be turned on, resulting in the phenomenon of the microwave oven fuse being blown out, at this time, it is only necessary to replace the same model or matching fuse or install a stabilized microwave.

The device of the furnace power supply can be troubleshooting.

3. The microwave oven overcurrent causes the burning insurance.

1) The aging function of the magnetron decreases, which increases the working current.

2) The performance of the high-voltage capacitor and the forward resistance of the high-voltage diode increase. In this case, the capacity of the high-voltage insurance can be appropriately increased.

4. The microwave oven fuse is blown due to a failure in the high-voltage system.

At this time, you can power on the microwave oven, and if you find that the tray can run normally after the microwave oven is powered on, and the fan will also move, this means that the problem does not appear in the transformer or power control system, but in the high-voltage system, and the high-voltage silicon stack and high-voltage capacitor can be checked at this time.

If the high-voltage capacitor has broken down, it can be proved that the cause of the fuse in the microwave oven is the excessive short-circuit current of the transformer. In this case, only the capacitor of the same specification and model needs to be replaced to eliminate the fault.

5. When the working current increases, the microwave oven fuse will be blown out.

The magnetron of the microwave oven controls the working current in the machine, so the increase in the working current is caused by the decline of the aging function of the magnetron, and the fault can be eliminated by simply replacing the magnetron.

Answer: Hello, the reason why Midea's microwave oven high voltage fuse always burns is that the wire contact is not good, the high-voltage transformer is damaged, the high-voltage capacitor is damaged, and the magnetron is damaged. In addition, we have a habit when using Midea microwave ovens, and we will close the door after use, in fact, this will cause the water vapor in the microwave oven to not go away, and the inside will be wet, causing the fuse to burn easily.

Question: Hello, I pulled out the primary line of the high-voltage transformer, or burned the fuse inlet line to protect the line.

The door microswitch is normal.

Hello, it may be caused by a transformer problem!

Question: Before I used to use electricity, I changed the front computer control circuit board, replaced the fuse micro switch, I used the meter to measure it normally.

Answer: Hello, first of all, it is necessary to eliminate the inter-turn short circuit inside the transformer. The method is to disconnect the secondary windings (including each group of filament power supply) from the circuit, and eliminate the internal fault of the transformer, so that the transformer can work at no load according to the filament, so that the power can be added, and the output AC voltage of each winding is normal 1, the power transformer of the gall machine burns the fuse, +b voltage and other sequences to add the test part by part, and focus on the detection of rectifier tubes (especially silicon diodes), filter capacitors and other components, until the fault components are found to eliminate the fault, the temperature rise is normal, then the internal fault of the transformer can be eliminated, Otherwise, the transformer can only be rewound or replaced.

You can find a maintenance master to come to do a comprehensive inspection!

Safety comes first, life is the most important.

If the fuse bursts as soon as it is started, it may be that the micro switch is a problem with the door switch, and the door switch action sequence is wrong. If the fuse is burst two or three seconds after starting, it may be that the high-voltage components inside the microwave oven are faulty, and it is possible that the high-voltage transformer is broken, and the high-voltage capacitor is broken.

The microwave oven is energized and the fuse is usually the linkage switch of the door is invalid or slow, and the short circuit of the components of the high-voltage part will also cause the fuse to be burned when the machine is turned on.

What is the problem of burning the fuse all the time when the microwave oven is not powered on? In addition to measuring with a multimeter that there is a short circuit in the part, most of them also have this reason.

The microwave oven always burns the insurance, don't replace it directly, teach you a trick, and fix it in minutes.

The failure of the power control system, high-voltage transformer, and high-voltage DC will cause burn-in failure. Here's how to judge:

1. Power control system: when the plug of the primary power cord of the transformer is not plugged and unplugged, and the power supply is still on, the interlock switch between the inspection door and the monitoring switch (short-circuit switch) is damaged or the switch is not in place; Whether there is a short circuit between the power cords or wires.

2. The transformer is connected to the plug for the first time, and the wire is pulled out for the second time. If the power supply is still on, the transformer will be replaced due to damage due to a short circuit.

3. Insert the transformer into the terminal, the power supply is still safe, and then break down some high-voltage circuit components, common high-voltage rectifier diodes, and high-voltage filter capacitors.

The microwave oven circuit is divided into three parts: power control system, high-voltage transformer, and high-voltage DC. These three parts of the failure will cause the failure of the burn insurance. The steps of the judgment method are briefly described as follows:

1. Power control system: unplug the primary power cord of the transformer, and the fuse is still burned when the power is on, then check that the door interlock switch and monitoring switch (short circuit open and off) are damaged or the switch is not in place; Whether there is a short circuit between the power cords or wires.

2. The transformer is plugged in and wired in the primary stage, and the wire is unplugged in the secondary. If the zhidao is powered on and the fuse is still burned, the transformer will be replaced by internal short-circuit damage.

3. If the transformer is plugged into the terminal and the fuse is still burned when the power is on, the high-voltage part of the circuit components will break down, and there are common high-voltage rectifier diodes and high-voltage filter capacitors.

3 switches are not measured normally, to see if the stroke of the switch is smooth, the switch is not in place, mainly pay attention to the door linkage switch is normal or not, usually the abnormal insurance will burn very black black (high current). If the switch itself is fine, it is necessary to clean and adjust the installation position of the switch to make it normal

You can see if the monitoring switch (i.e., the short-circuit switch) is not completely operated, and if there is oil stain, you can clean it up.

I'll ask you if I have any questions in the future, Master, thank you.

It is estimated that there is a problem with the coil reel, check the line!

There can be several reasons why a microwave oven can blow a high-voltage fuse, and here are some of the common ones:

If the turntable in the microwave oven does not rotate, food disturbances will accumulate inside the microwave oven, causing the internal temperature of the microwave oven to be too high, thus blowing the high-voltage fuse.

Metal objects in the microwave oven: Metal objects should not be placed in the microwave oven, because the metal will reflect the microwaves and produce electric sparks, which can cause the high-voltage fuse to blow out.

Aging damage: The high-voltage fuse may be blown out due to aging damage, and the high-voltage fuse needs to be replaced.

If the power supply voltage is too high or too low, it will also cause the high-voltage fuse to blow out.

High-voltage transformer failure: If the high-voltage transformer inside the microwave oven fails, it can also cause the high-voltage fuse to blow.

It should be noted that the microwave oven is a high-voltage electrical appliance, if you do not have the relevant maintenance and overhaul knowledge, do not disassemble and repair the microwave oven by yourself to avoid safety accidents. If the microwave oven frequently blows the high-voltage fuse, it is recommended to contact a professional for service and repair.

There may be several reasons why a microwave oven blows a high-voltage fuse:

1.High Voltage Capacitor Failure: High voltage capacitors are one of the important components of a microwave oven, storing charge and releasing energy during the over-guessing process. If a capacitor fails, the voltage in the high-voltage circuit will be too high, and the high-voltage fuse will be blown out.

2.High-voltage transformer failure: The high-voltage transformer is an important device to convert low voltage into high voltage, if the transformer fails, it will also cause the high-voltage circuit voltage to be too high, causing the high-voltage fuse to burst.

3.Supply voltage too low or too high: If the supply voltage connected to the microwave oven is too low or too high, it can also cause the circuit voltage to be too high or too low, which can blow the high-voltage fuse.

4.Other circuit failures, such as damaged high-voltage diodes, faulty motors, etc., may cause the microwave oven high-voltage fuse to blow.

Therefore, when the microwave spike blast furnace blows the high-voltage fuse, it is necessary to find the cause and repair it in time, otherwise it may pose a threat to personal safety and the life of the equipment. It is recommended to find a professional to carry out the overhaul.

There are several possible reasons why a microwave oven can blow a high-voltage fuse:

High-voltage transformer failure: The high-voltage transformer is one of the core components of the microwave oven, which converts low-voltage electrical energy into high-voltage electrical energy and supplies the magnetron and motor of the microwave oven. If a high-voltage transformer fails, it can cause excessive current, which can blow the high-voltage fuse.

Magnetron failure: The magnetron is another important part of the microwave oven, which converts high-voltage electrical energy into microwave energy and supplies the heating chamber of the microwave oven. If the magnetron fails, it can cause the current to become too high and blow the high-voltage fuse.

Capacitor failure: Capacitor is another important component of the microwave oven, which can store electrical energy and supply it to the microwave oven's magnetron and motor. If the capacitor fails, it is possible that the lead will cause the current to be too high and blow the high-voltage fuse.

Failure of the high-voltage fuse itself: The high-voltage fuse may fail due to aging, damage, etc., resulting in a breakout.

If the microwave oven always blows the high-voltage fuse, it is recommended to contact professional maintenance personnel in time for maintenance and repair.

Summary. Hello dear, the element next to the microwave fuse is ignited probably because of 1Magnetron damage 2

High voltage diode damage 3Wire contact is not good 4Poor contact of temperature switch or timer contact5

Damaged computer board 6High voltage transformer damage 7The high-pressure fuse is damaged8

The high-voltage capacitor is damaged.

Hello dear, the element next to the microwave fuse is ignited probably because of 1Magnetron damage 2High voltage diode damage 3

Wire contact is not good 4Poor contact between temperature control switch or timing destroyer, such as the contact of the device5Damaged computer board 6

High voltage transformer damage 7The high rubber loss pressure fuse tube is damaged 8Damage to high-voltage fibers or capacitors.

It is due to the overcurrent of the operation, which leads to the burning of the fuse, including the decline of the aging function of the magnetron, which increases the working current. 2) The performance of the high-voltage capacitor and the forward resistance of the high-voltage diode increase. In this case, the capacity of the high-voltage insurance can be appropriately increased.

3. The aging function of the magnetron decreases, which increases the working current. This situation requires the magnetron to be replaced. 4. The fuse is not matched, or the voltage is unstable, which is caused by the self-fusing protection of the microwave oven.

Replace the fuse or install a regulated power supply device. 5. If the fan and tray are running normally after power-on, it indicates that the power control system and transformer are intact and the fault is in the high-voltage system. If it is found that the high-voltage capacitor has broken down, it means that the cause of the fuse blowing in the machine is that the secondary short-circuit current of the transformer is too large.

Or after replacing the capacitor of the same specification, the fault can be eliminated.

In addition to the reason for ignition, there are other reasons for He to bury the limbs, that is, we often put a lot of grease in the microwave oven for heating, for a long time, if we do not wipe or clean the grease on the mica sheet in time, when heating, due to the rapid rise of the oil temperature, reach the Zen world for two or three, so that the mica sheet is burned out, the prevention method is to clean the liquid grease on the mica sheet in time.

If it is very serious, it is recommended that you go for a repair, as this can be dangerous.