Common sense books on home appliance maintenance

1. Common sense of home appliance maintenance

Common sense of home appliance maintenance 1. What knowledge do you need to master in general home appliance maintenance?

The maintenance of household appliances is a general concept, and the scope of household appliances also involves audio-visual categories, such as televisions, DVD players, stereos, power amplifiers, MP3.MP4, and various types of portable DVD players and music players. Refrigeration category: refrigerator, air conditioner, cold storage, ice maker, ice cream machine, automobile air conditioner, etc. Washing machines: For example, domestic washing machines and industrial washing machines. Kitchen appliances: rice cooker, induction cooker, electric frying pan, microwave oven, range hood, ventilator, disinfection cabinet, dishwasher, etc. And small household appliances.

Therefore, in the maintenance of household appliances, in addition to the corresponding professional knowledge of electronic technology, we should also have relatively solid knowledge of electricians, fitters and integrated wiring, as well as strong hands-on ability, and be good at doing some simple design and transformation work.

In order not to be eliminated by the ever-changing electrical appliances and the increasingly competitive market, we must persevere, accumulate rich practical experience and constantly learn advanced theories and knowledge.

2. What knowledge do you need to master to maintain household appliances?

To be a high-precision home appliance maintenance technician, you need to master a lot of knowledge.

The main knowledge is as follows;

1, basic theory: electrician basic knowledge, semiconductor transistor circuit knowledge, instrument use knowledge, digital circuit knowledge, microcomputer knowledge, etc.

2. Maintenance operation skills: learn general operations, such as shell disassembly of electrical equipment, daily use of related tools and equipment, welding technology of electric soldering iron, oxygen wind welding technology, manual connection technology of various wires, etc.

3. Special maintenance features of main electrical appliances: For example, the refrigerator has the working principle of compressor and condenser, which involves the filling and pressure testing of freon, and the dredging and welding of pipelines; The TV set has a high voltage circuit and a line field scanning circuit; The washing machine has time control circuit and computer chip; Rice cookers have magnetic control circuits and so on.

4, maintenance experience accumulation: this depends on yourself. Good at taking maintenance notes, reading maintenance magazines and online materials.

I want to learn some knowledge about home appliance maintenance.

First, the maintenance of ordinary rice cookers The principle and structure of ordinary rice cookers are relatively simple. If there is any fault, it can be repaired by itself 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 embedded with electric heating tubes. Put the inner pot on it, and you can see it when you take it off. 2. Temperature limiter: also called magnetic steel.

It is equipped with a permanent magnet ring and a spring, which can be pressed and located in the center of the heating plate. When cooking, when the cooking switch is pressed, the lever switch is driven by the attractive force of the 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 the bimetal bends upward because of the different thermal expansion and contraction rates of the two pieces of metal that make up the bimetal. When the temperature reaches above 80C, the normally open and normally closed contacts are driven by the spring leaf under the push of the upward bent 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 down and recovers, the normally open and normally closed contacts are switched again, and the heating pipe is electrified for heating. 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 of the heating tube, and at the same time supply power to the heating indicator light to make it light up.

After the meal is ready, the temperature limiter bounces down and drives the lever switch to disconnect 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. Common troubleshooting 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, the socket can be scrubbed and dried, and then continue to be used.

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 temporarily used, but if conditions permit, it is best to replace it.

2) Phenomenon: I can't cook. Overhaul: 1, power supply lead 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, the current limiting resistor of the same model must be replaced, and it must not be careless. 3. The heating tube in the heating plate is burnt out.

At this point, check the heating pipe with an ohmmeter. If the circuit is damaged, 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 the rice cooker is used to check whether the magnetic ring is damaged and how attractive it is.

If it is damaged, only new magnetic steel can be replaced. 4) Overhaul of cooked rice: This fault may be caused by sintering and jamming of normally closed contact of thermal insulation switch.

Although the temperature limiter jumped off after the rice was cooked, the insulation switch continued to energize the heating pipe and the rice burned. 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 blocking of the circuit, and the heating pipe does not work.

At this point, you can clean the contact surface with fine sandpaper and polish it smooth. If the ablation is serious, only a new insulation switch can be replaced.

One thing that must be paid attention to when repairing the rice cooker is that strong electricity will pass through the inside of the rice cooker when working, and most of the internal components are * * *, so it is necessary to ensure that the strong electricity components cannot touch the shell of the rice cooker when repairing. After the maintenance, the insulation resistance between the plug and the shell of the rice cooker must be measured with * 10k of the ohm range of the multimeter, 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. In order to make Midea's service outlets use the parts of induction cookers to repair induction cookers quickly and accurately, the book "Principles and Maintenance of Induction Cookers" is specially compiled, and the principle of induction cookers is emphatically analyzed with PD 16 as the template. I hope everyone can analyze the fault by themselves through the principle, so as to draw inferences from others.

Chapter 1 Working principle of induction cooker 1. Overview of the working principle of the induction cooker When the induction cooker works normally, the alternating magnetic field generated by the coil on the induction cooker repeatedly cuts and changes at the bottom of the pot, which makes the bottom of the pot generate annular current (eddy current) and generates heat by using the short-circuit thermal effect of small resistance and large current. 2. Electrical schematic diagram of PD16 induction cooker 3. PD 16 Working Block Diagram of Induction Cooker Chapter II Functions of Induction Cooker 1 Main Components. Ceramic plate: imported advanced heat-resistant crystalline ceramic plate.

2. High-voltage main substrate: constitutes the main current loop. 3. Low-voltage main substrate: computer control function.

4.LED circuit board: display working status and transmit operating instructions. 5. Coil: Convert high-frequency alternating current into alternating magnetic field (PAN).

6. Fan assembly: heat dissipation auxiliary element (fan). 7.IGBT: Control the on-off of large current through small current signal.

8. Bridge rectifier block: convert AC power supply into DC power supply (BD 10 1). 9. Thermistor: It transmits thermal signals to the control circuit.

10. Thermal control switch assembly: it senses the working temperature of IGBT, thus protecting IGBT from overheating damage. Chapter III Functions of Induction Cooker Manifold Block 1, C80C49- 143A: Quick integration of Central Processing Unit (Ic 1).

2.SN7407N: High voltage output buffer/driver (Ic2). 3. HD74LS 145: four.

4. Do small household appliances maintenance and want to know more about small household appliances.

Maintenance of Jiuyang Induction Cooker

E0 internal circuit fault E 1 no pot or improper pot [quality/size/shape/position] E2 machine internal heat dissipation or internal temperature sensor fault E3 power grid voltage is too high E4 power grid voltage is too low E5 ceramic plate temperature sensor of Chinese business interaction community broke E6 pot, the pot temperature was too high, and the ceramic plate temperature sensor was short-circuited.

Jiuyang JYC- 18D

E0 internal circuit fault E 1 function light flashes, alarm does not put the pot or the pot is too small. E2 is overheated internally, the tuyere is blocked, the fan does not turn, the IGBT temperature sensor is open or short-circuited, E3 voltage is too high, E4 voltage is too low, E5 ceramic plate temperature sensor is open, and E6 ceramic plate temperature sensor is short-circuited.

Jiuyang JYC- 19AS8

E0 Machine internal circuit fault E 1 function light flashes, warning that the pot is not put down or the pot is too small. E2 machine is overheated, the tuyere is blocked, the fan does not turn, and the IGBT temperature sensor is open or short-circuited. E3 voltage is too high, E4 voltage is too low, E5 ceramic plate temperature sensor is open, E6 can is dry, can is too high, and ceramic plate temperature sensor is short-circuited. E8 is wet or dirty inside.

The above is part of the information, more depends on the description of each household appliance, which is the right medicine. Then, from the above questions, you can go to the "300 Mall" home appliance wholesale network to have a look. A lot of common sense of small household appliances hope to give you some help.

5. What is the basis of learning home appliance maintenance?

Personally, I don't think doing maintenance work is completely boring. It's not just maintenance. Failure is like playing hide-and-seek with you. When you encounter complex problems, you should have perseverance and perseverance.

Generally, complicated problems are capacitance leakage (non-polarity) of small components and resistance increase of resistors. When you repair it, you may know more about this part of the circuit. I must be in a good mood.

Needless to say, you need to be proficient in maintenance, such as electronic components and circuit diagrams. Now, with the trend of upgrading and elimination of electronic products, you must not fall behind. We should know that no matter what people invent, we should innovate and understand the current flow in the circuit. It's just difficult to find information about many highly integrated circuits.