tips on home appliance maintenance 1. what knowledge do you need to master in general home appliance maintenance
home appliance maintenance is a relatively general concept, and the scope of home appliances also involves: audio-visual categories, such as TV sets, DVD players, stereos, power amplifiers, MP3.MP4, and various types of portable DVD players, listening to music, etc. Refrigeration category: refrigerator, air conditioner, cold storage, ice maker, ice cream machine, air conditioner for automobile, etc. Washing machines: for example, domestic washing machines and industrial washing machines. Kitchen appliances: electric cooker, induction cooker, electric frying pan, microwave oven, range hood, ventilator, disinfection cabinet, dishwasher, etc. There are also small household appliances.
Therefore, in the maintenance of household appliances, apart from the corresponding specialized knowledge of electronic technology, you should also have a solid knowledge of electricians, fitters, integrated wiring, and strong hands-on ability, and be good at doing some simple design and transformation work.
To maintain household appliances, we must persevere, accumulate rich practical experience and constantly learn advanced theories and knowledge, so as not to be eliminated by the ever-changing appliances and the increasingly competitive market.
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: basic knowledge of electricians, knowledge of semiconductor transistor circuits, knowledge of using instruments, knowledge of digital circuits, knowledge of microcomputers, etc.
2. Maintenance and operation skills: Learn general operations, such as shell disassembly of electrical equipment, routine use of related tools and equipment, soldering technology of electric soldering iron, oxygen wind welding technology, manual connection technology of various wires and so on.
3. Special maintenance features of main electrical appliances: for example, the refrigerator has the working principle of compressor and condenser, which involves filling and pressure testing of Freon and pipeline dredging and welding; The TV set has a high voltage circuit and a line field scanning circuit; The washing machine has time control circuit and computer chip; The rice cooker has a magnetic control circuit and so on.
4. Maintenance experience accumulation: It's all up to you. Be good at taking maintenance notes, read maintenance magazines and online materials.
3. I want to learn some knowledge about home appliance maintenance.
1. Maintenance of ordinary rice cookers The principle and structure of ordinary rice cookers are simple. If something goes wrong, it can be repaired by myself 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 thermal insulation 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 an electric heating tube embedded. The inner pot is placed on it, and you can see it when you remove it. 2. Temperature limiter: also called magnetic steel.
it is equipped with a permanent magnetic ring and a spring, which can be pressed and located in the center of the heating plate. When cooking rice, when the cooking switch is pressed, the lever switch is driven by the attraction of the magnetic steel to keep the power contact connected. When cooking rice, the temperature at the bottom of the pot keeps rising, and the attraction of the permanent magnetic ring decreases with the increase of temperature. When the water in the inner pot is evaporated and the temperature at the bottom of the pot reaches 13±2C, the attraction of the magnetic ring is less than the elasticity of the spring on it, and the temperature limiter is pushed down by the spring to drive the lever switch and 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 bimetallic strip is bent upward due to the different thermal expansion and contraction rates of the two pieces of metal that make up the bimetallic strip. When the temperature reaches above 8C, the normally open and normally closed contacts are driven by the spring piece under the push of the upward bent bimetal, so as to cut off the power supply of the heating tube and stop heating.
when the temperature in the pot drops below 8C, the bimetal gradually cools and recovers, and the normally open and normally closed contacts are switched again, and the heating tube is powered on 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 supply to 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 will spring down to drive the lever switch to disconnect the contacts. After that, the heating tube is only controlled by the insulation switch.
5. Current-limiting resistor: The appearance is mostly golden yellow or white, and the size is like a 3W resistor. It is pressed between the heating tube and the power supply to protect the heating tube. The commonly used current limiting resistor is 185C 5A or 1A (depending on the power of the rice cooker).
Current-limiting resistor is the key element to protect heating tube, and it can be replaced by wire. Troubleshooting of Common Faults 1) Phenomenon: Plug in the power plug and the power fuse will blow immediately.
maintenance: 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 clean and dried, and then used continuously.
2. The surface of the power socket or plug of the 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 up or used temporarily, but it is best to replace it if conditions permit.
2) Phenomenon: You can't cook. Maintenance: 1. The power supply wire is open.
use the ohmmeter to check the power lead. 2. The current limiting resistor is blown.
this kind of situation is more common. At this time, the resistance can be checked by multimeter ohm block.
if the resistor is blown, it must be replaced with a current-limiting resistor of the same model, and it must not be careless. 3. The heating tube in the heating plate is burnt out.
at this time, check the heating tube with the ohmmeter. If the circuit is broken, only a new heating plate of the same model can be replaced. 3), phenomenon: cooking raw rice.
maintenance: this fault is generally caused by the weakening of the permanent magnetic ring in the temperature limiter. The detachable temperature limiter of the 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) Overhaul of cooked rice: This fault may be caused by sintering and sticking of normally closed contacts 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 burned. At this time, the contact can be separated with a knife, and then the contact surface can be cleaned 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, so that the contact resistance of the contact is too large, resulting in the contact being closed and the circuit being blocked, and the heating tube not working.
at this time, the contact surface can be cleaned with fine sandpaper and polished smoothly. If the ablation is serious, you can only replace it with a new insulation switch.
one thing that must be paid attention to when maintaining the rice cooker is that the inside of the rice cooker passes through strong electricity 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 *1k block of the ohm block 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 cooking utensils, and induction cookers have also entered thousands of households. In order to make Midea's service outlets use the parts of the induction cooker to repair the induction cooker quickly and accurately, the Principle and Maintenance of the Induction Cooker is specially compiled, with PD16 as the template, and the principle of the induction cooker is emphatically analyzed. I hope everyone can analyze the faults by themselves through the principle, so as to draw inferences from others.
chapter I working principle of induction cooker 1. overview of working principle of induction cooker when the induction cooker is working normally, the alternating magnetic field generated by the coil on the coil of induction cooker repeatedly cuts and changes at the bottom of the cooker, which makes the bottom of the cooker 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. Working block diagram of PD16 induction cooker Chapter II Functions of main components of induction cooker 1. Ceramic plate: imported advanced heat-resistant crystallized 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 operation instructions. 5. Coil: Convert high-frequency alternating current into alternating magnetic field (PAN).
6. FAN assembly: heat dissipation auxiliary element (fan). 7. IGBT: It controls the on-off of high current through low current signal.
8. bridge rectifier block: convert AC power supply into DC power supply (BD11). 9. Thermistor: it transmits the heat signal to the control circuit.
1. thermal switch assembly: it senses the working temperature of IGBT, thus protecting IGBT from overheating damage. Chapter III Functions of Integrated Block of Induction Cooker 1. C8C49-143A: Fast Integration of Central Processing Unit (Ic1).
2. SN747N: high voltage output buffer/driver (Ic2). 3, HD74LS145: four.
4. Do small household appliances maintenance and want to know more about small household appliances
Maintenance of Jiuyang induction cooker
E internal circuit failure E1 No pot or cooker [quality/size/shape/position] is not suitable. The internal heat dissipation of E2 machine is poor or the internal temperature sensor fails. E3 power grid voltage is too high. Chinese business interaction community E4 power grid voltage is too low. E5 ceramic plate temperature sensor of Chinese business interaction community E6 cooker is broken and dry-burned. The temperature of the cooker is too high, and the temperature sensor of the ceramic plate is short-circuited
The circuit fault in Jiuyang JYC-18D
E machine is flashing, and the alarm is that the cooker is not put down or the cooker is too small. E2 machine is overheated, the tuyere is blocked, and the fan does not turn. IGBT temperature sensor open circuit or short circuit E3 voltage is too high E4 voltage is too low E5 ceramic plate temperature sensor open circuit E6 ceramic plate temperature sensor short circuit.
Jiuyang JYC-19AS8
E internal circuit fault E1 function light flashes, alarm does not put the pot or the pot is too small E2 internal overheating, the tuyere is blocked and the fan does not turn. 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 cookware is dry-burned, cookware temperature is too high, and ceramic plate temperature sensor is short-circuited. E8 is wet or dirty inside.
The above is part of the information, and more is to look at the description of each household appliance, which is the right medicine. Then, from the above questions, you can go to the "Sanbai Mall" home appliance wholesale website to look at it. Many common sense of small household appliances hope to give you some help.
5. What are the basics of home appliance maintenance?
Personally, I don't think it's completely boring to engage in maintenance, not only the maintenance fee, but also the failure is like playing hide-and-seek with you. If you encounter complicated problems, you should have perseverance.
Often, the complicated problems are the leakage of small components (non-polarity) and the increase of resistance. When you fix it, you may have a better understanding of this part of the circuit. I must be in a good mood.
You need to be savvy and comfortable in maintenance, and it goes without saying that you need to know the basics of electronic components and circuit diagrams. Now, with the trend of upgrading and eliminating electronic products, you must not lag behind. We should know that no matter what is invented by people, we should be innovative and understand the current flow of circuits. It's just that it's hard to find information about many circuits with high integration.