1: major of electronic appliance application and maintenance

There are many subjects, such as: electrical and electronics, home appliance fault maintenance, internal PLC, mold drawing, electronic capacitance drawing. ......

2. Electronic information engineering and electrical technology

3. Home appliance maintenance major

4. Mechatronics major

5. Electronics and Electrician Major

There are many things, depending on how you choose. You should carefully check your qualifications, teaching ability and internship ability. Good luck.

⑵ What major does home appliance repair belong to?

Electronic and electrical specialty can't learn anything at school, so it is recommended to be a maintenance apprentice.

⑶ What is your major in home appliance maintenance?

Learn the fundamentals of electrical engineering, electronic circuits, integrated circuits, analog electronic circuits, radio transmission and reception principles, and rapid maintenance techniques. Electronic basic capacity, radio, power amplifier, stereo, washing machine, audio equipment, black and white, ordinary color TV, remote control circuit; Installation, principle and maintenance technology of solar water heaters, induction cookers, CDs, VCDs, DVDs, power amplifiers, electric fans, smart appliances and other household appliances.

(4) What major do you want to learn to repair household appliances or machines?

Choose a major to see your hobby, interest is the best teacher. You said that the major of application and maintenance of electronic information technology is different from the major of answering electricity about returning machines.

Dragons, as long as they are refined, are equally popular. Both of them are maintenance professionals, just one size. I study electrical maintenance, which is very practical. Not everyone can make a bad thing better, don't you think? Good luck, friend.

5] What major should I study if I want to learn home appliance maintenance when I grow up?

Home appliance maintenance major = = electrical and electronic technology

I. Maintenance of Ordinary Rice Cookers

Ordinary rice cookers are simple in principle and structure. If something goes wrong, they can repair it by themselves without bothering professional maintenance personnel.

Structure of ordinary rice cooker: The ordinary rice cooker is mainly composed of a heating plate, a temperature limiter, a heat preservation switch, a lever switch, a current limiting resistor, an indicator lamp, a socket and the like.

1, heating plate: This is the main heating element of the rice cooker. This is an aluminum alloy disk with electric heating tubes embedded in it. Put the inner pot on it, and you can see it when you remove the inner pot.

2. Temperature limiter: also called magnetic steel. Equipped with permanent magnet ring and spring, it can be pressed at the center of the heating plate. When cooking, press the cooking switch, and the lever switch is driven by the attraction of magnetic steel to keep the power contact connected. When cooking, the temperature at the bottom of the pot keeps rising, and the attraction of the permanent magnet ring decreases with the increase of temperature. When the water in the inner pot evaporates and the bottom temperature of the pot reaches 103 2C, the attractive force of the magnetic ring is less than the elastic force of the spring on it, and the temperature limiter is pressed down by the spring to drive the lever switch to cut off the power supply.

3. Thermal switch: also known as thermostat. It consists of a spring leaf, a pair of normally closed contacts, a pair of normally open contacts and a bimetal. When cooking, the temperature in the pot rises, and because the two pieces of metal that make up the bimetal have different rates of thermal expansion and cold contraction, the bimetal bends upward. When the temperature reaches above 80C, the normally open and normally closed contacts are driven by the spring plate under the push of the upward bending bimetal, thus cutting off the power supply of the heating pipe and stopping heating. When the temperature in the pot drops below 80C, the bimetal gradually cools and recovers, the normally open and normally closed contacts are switched again, and the heating pipe is electrified and heated. This is repeated, that is, the heat preservation effect is achieved.

4. Lever switch: This switch is completely mechanical and has a normally open contact. When cooking, press this switch to turn on the power supply of the heating tube, and at the same time supply power to the heating indicator lamp to light it up. When the meal is ready, the temperature limiter jumps down to drive the lever switch to break the contact. After that, the heating pipe is only controlled by the insulation switch.

5. Current limiting resistor: The appearance is mostly golden yellow or white, and the size is like 3W resistor. It is pressed between the heating tube and the power supply to protect the heating tube. Common current limiting resistors are 185C 5A or 10A (depending on the power of the rice cooker). Current-limiting resistor is the key element to protect the heating pipe, which can be replaced by wire.

Maintenance of Common Faults

1), phenomenon: plug in the power plug and the power fuse will blow immediately.

Overhaul: 1. Water or rice soup enters the power socket of the rice cooker, causing a short circuit. In this case, you can scrub and dry the socket, and then continue to use it. 2. The surface of power socket or plug of rice cooker is carbonized. In this case, it is best to replace it with a new socket or plug. If carbonization is not serious, it can be cleaned or used temporarily, but it is best to replace it if conditions permit.

2) Phenomenon: I can't cook.

Overhaul: 1, the power cord is open. Check the power cord with an ohmmeter. 2. The current limiting resistor is blown. This situation is more common. At this time, you can check the resistance with the multimeter ohm file. If the resistor is burnt out, it must be replaced with a current-limiting resistor of the same model, and it must not be careless. The heating tube in the heating plate is burnt out. At this point, check the heating pipe with an ohmmeter. If the circuit is broken, only a new heating plate of the same model can be replaced.

3) Phenomenon: Boiling uncooked rice.

Maintenance: This fault is generally caused by the weakening of the permanent magnet ring in the temperature limiter. The detachable temperature limiter of rice cooker is used to check whether the magnetic ring is broken and how attractive it is. If it is damaged, only new magnetic steel can be replaced.

4) Cook the rice.

Maintenance: This fault may be caused by sintering and sticking of normally closed contact of thermal insulation switch. Although the temperature limiter jumped off after the rice was cooked, the heat preservation switch continued to energize the heating tube and the rice was cooked. At this time, you can separate the contacts with a knife, and then clean the contact surface with fine sandpaper.

5) Phenomenon: You can't keep warm after cooking.

Overhaul: This fault may be that the normally closed contact surface of the thermal insulation switch is dirty or ablated, which makes the contact resistance of the contact too large, which leads to the closure of the contact and the blockage of the circuit, and the heating pipe does not work. At this time, the contact surface can be cleaned with fine sandpaper and polished smoothly. If the ablation is serious, only a new insulation switch can be replaced.

One thing that must be paid attention to when maintaining the rice cooker is that the inside of the rice cooker is electrified when working, and most of the internal components are * * *, so it is necessary to ensure that the components with strong electricity cannot touch the shell of the rice cooker when maintaining. After the maintenance, the insulation resistance between the plug and the shell of the rice cooker must be measured with the ohm range of the multimeter × × 10k, and it must be infinite before use.

Second, the principle and maintenance of induction cooker With the improvement of living standards, people gradually accept safe and hygienic cookers, and induction cookers have also entered thousands of households.

Fault analysis and maintenance methods

Phenomenon 1, boot burn insurance.

① First disconnect the terminal pin of the electromagnetic coil, replace it with a fuse tube, and measure the voltage across the capacitor C 102. Generally, the DC output voltage of bridge rectifier is 220 V-300 V If there is no voltage or the fuse keeps blowing, it is judged that the bridge rectifier block is broken.

Cause analysis: If the rectifier bridge breaks down, 220V AC will be directly short-circuited.

② There is voltage at both ends of C102. It is judged that IGBT is damaged, and the fault is eliminated after replacement.

Analysis reason: There is voltage across C 102, which indicates that the DC output of bridge rectifier is normal. If two output pins of IGBT are punctured, it is equivalent to DC short circuit.

③ The bridge and IGBT are not broken, but the fuse is still burned, and the IA83 16S integrated block is broken, and the fault will be eliminated after replacement.

Analysis reason: The output pulse angle of TA83 16S is too large, which leads to IGBT overload.

2. The fan doesn't work

① Unplug the fan strip and check whether there is 12V power supply. If there is, it means that the fan motor is broken.

Cause analysis: the power supply is normal, usually the fan motor is short-circuited or open-circuited.

② ② There is no 12V voltage on the fan patch panel, and the emitter of the driving transistor Q703 is broken down. Replace Q703 to eliminate the fault.

Analysis: Q703 is not broken, and the integrated block IC4 is broken. Replace it with the integrated block IC4 and troubleshoot.

③ The fan motor and Q703 are not broken, but the integrated circuit block IC4 is broken. Replace with IC4 integrated block, and solve the problem.

Analysis reason: If the seventh pin of IC block IC4 has no high-level output, then the emitter of Q703 has no bias voltage, and the integrated electrode of Q703 is still unable to conduct, and the power supply is in an off state.

Phenomenon 3. Start-up operation shows normal, but no heating.

① Measure whether there is a voltage of 18V at the third pin of TA83 16S. If there is no voltage, check whether Q20 1 and ZD20 1 are broken down. If there is any fault, correct the fault after replacement.

Analysis reason: If there is no voltage of 18V at the third pin of TA83 16S, the fault point should be the series voltage stabilizing circuit of the power supply, so the basic components constituting the series voltage stabilizing circuit must be checked first.

② The third pin voltage of ta 83 16S is 18V. After replacement, the fault should be solved in IC3 integrated block TA8316s.

Reason for analysis: The LED board displays normally and works normally, indicating that the computer control circuit is basically normal and the fuse is not blown, indicating that the high-voltage board is basically normal, but the IGBT cannot be turned on because there is no pulse output to the IGBT control electrode of TA83 16S.

Phenomenon 4. After the machine is turned on, the panel light flashes all the time.

(1) The crystal vibrates badly. After replacement, troubleshoot.

Analysis reason: the crystal oscillator is broken, resulting in no clock frequency input to the CPU, which makes the whole IC 1 CPU out of control.

Third, the TV structure: front shell, back shell

Circuits: power supply circuit, CPU computer control circuit, high-frequency receiving circuit, intermediate-frequency circuit, decoding circuit, power amplifier circuit, line scanning circuit, field scanning circuit, CRT (kinescope) and loudspeaker.

[6] What is your major in home appliance maintenance?

If you want to learn home appliance maintenance, you have to learn everything, such as refrigerators, air conditioners, color TVs, washing machines and so on. If you only know one or two things, people will think that your skills are not too hard, and they won't look for you next time.

What was the major of "home appliance repair" in the university?

Hello, there is no major in home appliance maintenance in the university. This household appliance category is relatively large, so it is not easy to set up a major in the university.

I want to learn this kind of home appliance maintenance. I should apply for any major and study everything in it.

household appliances

Maintenance has now become an important major, mainly aimed at the maintenance management of ordinary household appliances, mainly studying the basics of electronics and electricians, home appliance maintenance, refrigeration installation and maintenance, and high-end home appliance maintenance. This major has also solved the re-employment problem of some unemployed workers.

main content

1. The basic part of electrotechnics and electronics mainly studies electrotechnics principles, electronic circuits, integrated circuits, analog electronic circuits, radio transmission and reception, and rapid maintenance technology.

2. The home appliance maintenance part mainly studies electronic basics, radios, amplifiers, stereos, washing machines, audio equipment, black and white, ordinary color TVs and remote control circuits; Installation, principle and maintenance technology of solar water heaters, induction cookers, CDs, VCDs, DVDs, power amplifiers, electric fans, smart appliances and other household appliances.

3. In the part of refrigeration installation and maintenance, I mainly study electrician foundation, transistor circuit, refrigeration principle and fault maintenance, refrigerator, air conditioning refrigeration, refrigeration equipment, electrical appliances and control circuit principle, the use of refrigeration tools, the analysis and operation of refrigerator air conditioning circuit, the fault analysis, practical operation and installation technology of air conditioning, refrigerator, freezer and central air conditioning.

4. The maintenance part of high-grade color TV and flat-panel TV mainly studies the principle and maintenance of large-screen color TV unit circuit; Principle and maintenance of rear projection color TV unit circuit: basic knowledge of digital circuit and HDTV; Principle and maintenance of digital HDTV circuit: principle and maintenance of LCD TV: principle and maintenance of plasma TV: introduction of LED TV principle; The use of high-grade instruments; And the principle, detection and maintenance of high-grade computer LCD.

Levies, what is your major in repairing household appliances?

You think too much. . Let's go and fix the car now. Cars are also tens of thousands cheaper. . Who can repair home appliances now? . In summer, air conditioning may have an answer, and it may cost money to repair it. Other electrical appliances are broken, and now people directly replace them with new ones, which has passed the warranty period. . Learning to repair home appliances is out of date now. . . Now there are no computers and mobile phones. Now ordinary people are probably cars.

⑽ What should I learn in home appliance maintenance?

Electrical maintenance is the most basic application of radio specialty and the most practical aspect of this subject. Everyone who loves radio usually does some maintenance work, at least it is to repair the minor faults of the electrical appliances around him.

Steps/methods

direct-vision method

1. principle

Intuitive method is a maintenance method to find and eliminate faults through human eyes or other sensory organs.

2. Application

Intuitive method is the most basic test reason.

One of the methods of obstacles, the implementation process should adhere to the principle of simple before complex, external before internal. In practice, the first problem is how to open the cabinet. Secondly, the shapes, names, representative letters, circuit symbols and functions of various electronic components in the disassembled electrical appliances can be numbered in pairs. That is, electronic components can be accurately identified. As an intuitive method, inspection mainly has two aspects: one is the observation of physical objects; The second is the observation of the image. The former is suitable for various maintenance occasions, while the latter is mainly used for video equipment with images, such as TV sets.

Visual maintenance is mainly divided into the following three steps:

(1) Inspection before unpacking: Observe the appearance of electrical appliances to see if there are any collision marks, and whether the buttons, sockets and wires of electrical equipment on the machine are damaged.

(2) Inspection after opening the case: observe the circuit board and various devices in the machine to see if the fuse is blown; Whether there is any component collision or disconnection; Whether the resistor is burnt out or discolored; Whether the electrolytic capacitor has leakage, crack and deformation; Whether the copper foil and solder joints on the printed circuit board are intact, whether there are traces of trimming and welding by others, etc. When observing in the machine, you can move some parts by hand in order to check them comprehensively in an intuitive way.

(3) Check after electrifying: At this time, it depends on whether there is fire or smoke inside the electrical appliance; Ears should listen to whether there is abnormal sound inside the appliance; Sniff whether there is coking smell inside the electrical appliance; Contact with some pipes, integrated circuits, etc. See if they are hot. If there is abnormal fever, turn it off immediately.

3. A few notes

(1) The intuitive method is very simple and does not need other instruments. It is very effective for repairing common faults and damaged faults of electrical appliances.

(2) The intuitive detection method is comprehensive and closely combined with the experience, theoretical knowledge and professional skills of maintenance personnel. Mastering it skillfully requires a lot of practice.

(3) Visual inspection often runs through the whole repair process, and it is better to cooperate with other inspection methods.

Resistivity method

1. principle

Resistance method is a maintenance method to judge the fault by measuring the grounding resistance of integrated circuit, transistor pin and electrical unit circuit and the resistance of each element.

2. Application

Resistance method is one of the most basic troubleshooting methods. Generally speaking, there are two methods of resistance measurement: "online" resistance measurement and "off-welding" resistance measurement.

Measuring resistance "on-line", because the tested components are connected in the whole circuit, the resistance measured by multimeter will be affected by other parallel branches, so it should be considered when analyzing the test results to avoid misjudgment. The normally measured resistance will be equal to or less than the actual marked resistance of the component, and it is impossible to have a resistance greater than the actual marked resistance. If so, the component under test is faulty.

"Soldering" resistance measurement, because one end or the whole component is soldered from the printed circuit board, and then the resistance is measured with a multimeter, this method is troublesome to operate, but the measurement result is accurate and reliable.

(1) switchgear detection

There are many switching elements in various electrical appliances, and measuring their contact resistance and disconnection resistance is the most commonly used means to judge the quality of switching elements. The contact resistance of the on-line resistance measuring switch should be less than 0.5 Ω, otherwise it is poor contact. It is normal that the disconnection resistance should usually be greater than several thousand ohms.

(2) Quality inspection of components

Resistance method can judge the quality of resistance, capacitance, inductance coil and transistor.

When using resistance method, the resistance value of online resistance is generally tested first. After measuring the resistance of each component, the red and black bars of the multimeter should be exchanged once, and then the resistance should be measured again. This can eliminate the interference of external circuit network on the measurement results. The results of two resistance tests should be analyzed for reference. Key suspicious parts can be desoldered for further inspection.

(3) On-off detection of connectors

There are many connectors in electrical appliances, such as earphone sockets, power conversion sockets and various plug-ins on circuit boards, which can be tested by resistance method. For example, the contact resistance can be detected by inserting and unplugging the plug of the round hole socket. When testing other plug-in components, the contact resistance can be measured by swinging the connector. If the resistance value is uncertain, there is a poor contact fault.

3. A few notes

(1) resistance method is very effective for troubleshooting open circuit or short circuit faults. In testing, online testing is often used first. After problems are found, components can be removed before testing.

(2) On-line testing must be carried out in the case of power failure, otherwise the measurement results will be inaccurate and the multimeter will be damaged.

(3) When testing some integrated circuits with low voltage (such as 5V and 3V), don't use the R× 10k multimeter to avoid damaging the integrated circuits.

(4) When testing the quality of components online by resistance method, the red and black bars of the multimeter should be tested interchangeably to avoid the influence of external circuits on the measurement results.