What is the fault of Helvar EM590 screen changer smoke emitting

The smoke of the inverter can not be used, the smoke indicates that the inverter has burned out, and the main reasons for the inverter burning out are as follows: 1. Conductive dust and dust such as metals. (1) Excessive conductive dust such as metals causes short circuit in the main circuit.

2) Dust fills the cooling sheet, and the temperature is too high, resulting in tripping and burning. 2. Corrosive gas (1) Due to corrosive gas, the toggle switch and relay contact are poor. (2) Short circuit between crystals caused by corrosive gases (3) Short circuit of the main circuit caused by terminal corrosion.

4) Corrosion of the circuit board causes short circuit between various devices 3. Condensation, moisture, and moisture. (1) Discoloration of the door pole due to moisture, resulting in poor contact. (2) The ignition between the copper plates of the main circuit board caused by moisture.

3) Cause electrical corrosion and disconnection of the internal resistance of the inverter. (4) There is condensation in the insulating paper and the discharge breakdown phenomenon is caused 4The selection is not accurate, and the parameters are not adjusted to the best use state (1) The selection is not accurate, which will cause the inverter to be overloaded and the phenomenon of small horse-drawn carts (2) The parameters are not adjusted to the best use state, so that the inverter is often overcurrent, overvoltage and other frequent jump protection, and strain in advance Effective measures:

It is recommended to use Aosheng fully sealed inverter, which can be waterproof, dustproof and corrosion-proof, which can greatly reduce the failure rate and prolong the service life of the inverter.

In your case, it is recommended that you go to the local professional repair shop and let the master use the computer to detect the fault** and then deal with it.

The automobile industry is getting hotter and hotter, of course, it is better to choose auto repair, especially more and more cars, maintenance and beauty are indispensable, and the future of learning is very good.

Of course, I chose the auto repair industry, now there are more and more cars, very hot, the car can not be avoided when you buy it, so it must be repaired and maintained, and now the salary in the auto repair industry is also very high. Can be considered.

Nowadays, the *** of household appliances generally need to be repaired until they are scrapped, and household appliances are getting cheaper and cheaper, and many people will not consider repairing them even if they are broken, and buy new ones directly.

Of course, auto repair is more combined with reality, from the point of view of making money, auto repair makes more money, from the perspective of future development trends, cars will be more and more discoverable more and more rapidly, especially the rise of pure electric vehicles, so auto repair will be better.

The former, with a little more room for development, also has a lot of majors to choose from.

Definitely choose car repair. The prospects for development are very good.

Of course, it's auto repair, who would repair home appliances if they're so cheap.

Let's do a car repair. The development space is broad and more promising.

Automobile professional! Now that China has a large number of cars, I am not afraid of not having a job in this industry. As long as you are willing to endure hardships, you will definitely be able to make a lot of money.

Basically, it is universal, and the multimeter for automobile maintenance mainly requires a large current measurement.

The main requirement for repairing a multimeter for home appliances is accuracy.

Before the EFI truck was listed, machine repair and electrical appliances were separated, and now they are mechatronics.

In the past, auto maintenance workers have been divided into two types: mechanics and electricians, and the electrician is responsible for the problems encountered in the electrical circuits of automobiles when receiving orders. Engine, chassis and other system repairs are handed over to the mechanic. Mechanics generally have more physical work, while electricians are relatively relaxed, but sometimes mechanics need to cooperate with each other for maintenance.

The divisions are now less precise. Tend to mechatronics, that is, mechanics and electricians will do it. This kind of talent is also more popular with employers.

The difference is very big, these are two completely different types of work!! This is because automotive electrical circuit repair is the repair of electrical electrical appliances on a car. And car repair is about repairing the auto machinery itself!

It's so-so, there's nothing to repair anymore, and now it's all new.

Now the use of automobiles is increasing, the market demand for auto repair talents is also increasing, the development prospects of all aspects of auto repair are still very good, and the maintenance of automobile electrical appliances should also be good, but there are not many people in electrical engineering, and there are more people in car beauty and maintenance testing.

Electrician, Mechanic, Chassis, Electronic Control, High Jet, Electronics, Beauty, Sheet Metal.

The electrician is the electric circuit of the car, the machine repair is the engine, the chassis is the gearbox, the electronic control is the engine and the chassis. Electronics is the circuit of a computer board, and beauty should know it. The interior is outside the car wash modification, sheet metal is sheet metal painting, the recovery of the accident car.

There are four main parts: the body, the DU engine, the chassis, and the electrical equipment. Body repair is dao beauty spray paint, etc., inside.

There is also the electrical equipment, which are secondary! The most important thing is the chassis, which includes the drive train, steering system, driving system, and brake system! The engine is troublesome to repair, it includes five major systems, two major structures (i.e., crank linkage mechanism and valve mechanism!). ）

By the past division.

BAI is: mechanical, electrical, sheet DU, paint four major work, mechanic: major engine DAO and chassis part; Electrician:

All electrical equipment: sheet metal: frame and body shaping; Spray paint:

Completed exterior paint treatment. Now due to the popularization of mechatronics and the increase in accident shaping, it is no longer so detailed, but one of them is difficult to adapt to the maintenance of modern cars! Please refer to it!!

Auto repair is divided into auto mechanic parts. Appliance repair section. Sheet metal repair part. Painted part. Beauty and skin care. It is divided into these categories.

Repair, maintenance, sheet metal painting beauty, depending on your needs.

Mechanical, fast, fast, bad, beauty, sheet metal, painting, electronics, etc.

Mechanic, electrician, sheet metal, painting.

According to the relevant regulations of our country, the types of automobile maintenance are as follows: a type of automobile maintenance enterprise: engaged in automobile overhaul and assembly repair, can also be engaged in automobile maintenance, automobile minor repair and automobile special repair.

Class II Automobile Maintenance Enterprises: Engaged in Primary and Secondary Maintenance of Automobiles and Minor Repairs of Automobiles; Three types of special maintenance households: specializing in projects for body repair, painting, tarpaulin, seat cushion and interior decoration repair, electrical appliances, instrument repair, battery repair, radiator, fuel tank repair, tire repair, installation of automobile door and window glass, air conditioner, heater repair, fuel injection pump, fuel injector, carburetor repair, crankshaft grinding, cylinder boring, body cleaning and maintenance and other special repair or maintenance.

Three types of automobile maintenance enterprises: the definition of special automobile maintenance households is: engaged in automobile engine, body, electrical system, automatic transmission, body cleaning and maintenance, painting, tire dynamic balance and repair, four-wheel alignment detection and adjustment, oil supply system maintenance and oil replacement, fuel injection pump and injector maintenance, crankshaft grinding, cylinder boring, radiator (water tank), air conditioning maintenance, automobile decoration (tarpaulin, seat cushion and interior decoration), door and window glass installation and other special maintenance operations.

3 types of auto repair, that is, 2 lifts, paint room, plus some necessary equipment can be) the current standard in the first and second class of enterprises business scope is the same, the operation of the three types of households has a certain depth, to solve the current automobile maintenance market a large number of over-range business problems. The main difference between Class I and Class II enterprises is: Class I enterprises must provide their own completion inspection equipment, and Class II enterprises can outsource part of the completion inspection equipment; Secondly, the area requirements for production plants, business reception rooms and parking lots are different.

Since the business scope of Class I and Class II is the same, the requirements for personnel and management are the same. The difference between Class I automobile maintenance enterprises and Class II automobile maintenance enterprises is shown in the following table. A class of vehicle maintenance enterprises, a class of vehicle maintenance, and a class of vehicle maintenance.

According to the past division: mechanical, electrical, sheet metal, paint four major types of work, machine repair: major engine and chassis part; Electrician: All Electrical Equipment: Sheet Metal: Frame & Body Shape; Painting: Finish the exterior paint finish of the body.

Mechanical, electrical, white sheet metal, paint four major types of work, machine repair: the main repair of engine and chassis Zhi part; Electrician: All electricity.

DAO equipment: sheet metal: frame and body shaping; Painting: Finish the exterior paint treatment of the body. Now due to the popularization of mechatronics and the increase in accident shaping, it is no longer so detailed, but one of them is difficult to adapt to the maintenance of modern cars!

1) VAT.

Full-price repair and replacement services for cars, motorcycles, home appliances, etc., shall be taxed at the applicable VAT rate (17 for general VAT taxpayers and 6 for small-scale taxpayers). Persons with disabilities who provide repair and repair services are exempt from value-added nuisance tax. Revenues from the repair of automobiles, motorcycle repair shops (OK) to the provision of car wash services made shall be consolidated.

2) Urban maintenance and construction tax and education surcharge.

Value Added Tax, which shall be based on the actual amount of tax paid, at the applicable rate of the City Maintenance and Construction Tax and 3 Education Fee Surcharge. The proportional tax rate of urban maintenance and construction tax is applicable to different levels for taxpayers in different regions, and the specific tax rate is 7 if the taxpayer is located in the urban area; For taxpayers in counties and towns, the tax rate is 5; If the taxpayer's location is not in the urban area or town, the tax rate is 1.

3) Property tax. The property tax is based on its own tax residual value, which is subject to the property tax according to the regulations. The annual property tax is levied and paid in installments to the location of the property tax authority.

4) Urban land use tax.

Its taxation is based on the actual occupation of the land surface book and the tax is applicable to paying taxes in accordance with the regulations. The land use tax is calculated on an annual basis, and the local taxation authority where the tax is paid in installments.

5) Vehicle and vessel use tax.

The applicable tax rates for taxable travel are each year's tax. The tax on the use of vehicles and vessels shall be paid in installments in one year, and the tax shall be determined by the people of the provinces, autonomous regions and municipalities directly under the Central Government. The applicable tax rate for the use of automobiles and vessels is 60 to 320 yuan per year, which is levied by the local tax authorities of the taxpayer.

The taxpayer's location, the location of the unit, means the business, refers to the place of the person who resides.

6) Stamp duty.

Books, according to the number of records of evidence or tax certificates, receive vouchers listed in the tax law, according to the standard dosage.

7) Corporate income tax.

Income tax payable = (Gross income - tax credit for the project) Applicable tax rate.

The tax law stipulates that the enterprise income tax realized on an annual basis shall be prepaid in installments (monthly or quarterly), and the monthly or quarterly shall be terminated in advance, and the final settlement shall be paid in four months of the year, and the excess shall be refunded and the deficiency shall be paid 15 days after the end of the period.

8) Personal income tax.

For individual industrial and commercial households, the allowable deduction of costs, expenses and taxes is the balance after the taxable income, and the annual gross income is deducted before tax, according to the 5-level excess progressive tax rate from 5 to 35 of the individual income tax. Individual income tax enterprise income tax for individual industrial and commercial households, calculated on an annual basis, in a month of 7 days, taxpayers who pay the advance payment in advance every month shall be settled in the annual final settlement, and the excess refund and deficiency compensation shall be completed within three months.