D7000 has a loud focusing sound.

Hello, the focusing sound is probably that you are focusing in the dark. You can refer to the following information to identify refurbished machines:

1, shell The shell of the new machine is tightly attached, and the gap is smooth and smooth without burr. Refurbishers generally use imitation original shell, the gap is uneven and there are burrs, so the mobile phone shell is easy to close up and down loosely, leaving a lot.

The phenomenon of large gap. When recognizing, you can try to insert a small nail into the gap between the upper and lower covers of the mobile phone. If it can be plugged in, it is a refurbished machine. The surface of the shell is frosted like a new machine, and it is absolutely impossible for a mobile phone with small particles.

Not available for purchase. The paint on the machine shell was sprayed by JS. After a long time, the paint will fall off (the dust particles on the shell are caused by the operation without vacuum environment when painting);

2. The shell of the new machine has a faint sandalwood smell. If it is a refurbished machine, JS generally needs to beautify the fuselage. Although the appearance is smooth, it is not dry enough. When the cover is opened or the battery is taken out, it will smell of rubber, plastic or chemicals.

Smell;

3. Keyboard and data cable interface. Due to the long-term plugging and unplugging of the charger plug and data cable, there will be black scratches on the charging interface of the refurbished machine that are difficult to eliminate. Keyboard refurbishers mostly use keyboards on old machines or imitate keys.

Plates. The * * * of this keyboard is that it feels soft and has no toughness of the new keyboard;

4. Charging test. It is best to charge for a long time, generally 10 minutes or more. Because there are many refurbished machines that will run out of power after a long charging time. This is also a very effective method to judge the refurbished machine;

5.SIM card chip contact and battery contact. Generally, these two contacts JS cannot be replaced. If it is a refurbished machine, there will be obvious friction marks on the contacts of the SIM card chip, which looks very shiny. this is

Too much friction. If it is an unused chip of a new machine, the contact surface should be frosted;

6. Fix the screws. Mainly depends on whether there are obvious scratches at the interface between the screw and the blade, and whether there are pick marks on the two rubber pads below the inner screen.

7. Call quality. Bring your own SIM card for trial operation. Call a friend, preferably a landline, and ask the other party how the call quality is, whether the call sound is clear, whether there is noise, current sound and whether the volume suddenly drops.

Phenomenon; 8. price. Because the spare parts of refurbished machines are mostly early products with poor quality, the price is also low. If you encounter a mobile phone that is ridiculously low in price but is called parallel imports by merchants, you can basically conclude that it is a refurbished machine.

Briefly introduce the concepts of parallel and licensed mobile phones.

Although many people are familiar with the basic use of mobile phones now, too many people don't understand the difference between parallel imports and licensed products when purchasing machines, and even many people think that parallel imports are inferior goods and fakes. In view of this, I am now giving a big

The Economist makes a simple analysis and introduction.

So what is permission? I now include the definition of "licensed goods" that we generally refer to only based on China! In China, licensed products refer to products that are taxed by the customs, licensed by government documents and bound by laws.

Protection, the mobile phone license issued by the government and relevant institutions, labeled with online permission, and then distributed to the market by agents at official prices, is the real licensed product. So what is a mobile phone license?

Just like a car, every car needs its own legal license plate, otherwise it is a black car. So what's the use of this mobile phone license? First of all, it represents the symbol of licensed products. Second, it gives every licensed mobile phone.

The only ID card is to control the number of mobile phones entering the market and determine the price of mobile phones. So as long as it does not meet any of the above conditions, it is parallel imports. Parallel imports in the domestic market are divided into four categories. The first is smuggling.

Machine is the best and most expensive of all parallel mobile phones; The second category is the labeling machine, with the second highest quality, which is set up in China by some foreign manufacturers or other enterprises with technical strength for profit.

Factory OEM production; The third category is the assembly machine, and the quality is again. This kind of parallel machine is imported by some manufacturers, which produce their own accessories like building blocks and then piece together and weld them together. The fourth category has the worst quality and the price is also

The lowest is a pure refurbished machine, like Sony Ericsson T6 18. Just change the screen, change the shell and brush the mobile phone system, and T628 will be produced. Because the price difference between the two mobile phones is about 500, so

It is profitable, but the quality is very unstable. Generally, as long as the purchase point is a little more formal, the parallel imports we buy are all Class I parallel imports, and the quality can be assured. Because the quality of this parallel plane is smuggled from abroad,

Novel style, high quality (even styles and colors that can't be bought in China), and can be brushed manually, so the function and quality may be better than that of licensed products (you can check the mobile phone software version in engineering mode).

Moreover, because it is smuggled in bulk or enters the country by other means, it is duty-free, so the price is low and the quality is good, which is the first choice for parallel importers. Many people buy parallel imports mostly for this reason. The other three categories are generally not needed by themselves.

Yes, I won't buy it unless it's too informal. So what are the benefits of buying parallel imports? In addition to the price factor and the above reasons, it is more important to provide parallel maintenance in China, which is cheap, such as now.

Sony, the new high-end mobile phone on the market.

Ericsson costs more than 6,000 yuan, while parallel imports only cost more than 4,000 yuan, and the price difference reaches more than 2,000 yuan. Generally speaking, the price difference of mid-range machines is more than 654.38+10,000 yuan, especially Samsung's. Domestic maintenance costs have risen.

Generally, the first-class cost is only 20 yuan to 50 yuan, so it is tempting to buy parallel imports. If users buy mobile phones for practical purposes, then parallel imports are a more cost-effective choice for you. (But please note that although the laws in China are unhealthy.

All, but this kind of behavior still has legal responsibility. What are the advantages of buying licensed goods? First, licensed products are definitely three-pack, so if there is a problem, you can guarantee it for free and upgrade it for free (not just computers).

You can upgrade your mobile phone, and mobile phone upgrades are also very frequent. The upgrade may make the mobile phone run faster, improve some bugs and enjoy all the services of all chain stores and maintenance points in the country. And licensed mobile phone batteries are also possible.

The product quality is guaranteed, the software runs stably, the compatibility is good, and various programs are downloaded smoothly. If you particularly like a mobile phone, buying licensed products is your best choice.

Many people think it is "licensed" when they see that both Macao and Hong Kong say "original licensed". This is a wrong concept. I said at the beginning that the definition of parallel imports depends on where it is defined. The licensed products in Hong Kong and Macao are only available in.

Hong Kong and Macao are called licensed goods, but they are parallel imports in China. Because these "licensed goods" from Hong Kong and Macao have no formal channels to enter China, no taxes, no labels and so on, there is no doubt that these licensed goods from Hong Kong and Macao are goods from China.

The real price is really like "parallel imports". You can open the phone case and have a look. Domestic licensed goods all have such a small label as "network access permit", while licensed goods bought in Hong Kong and Macao do not have such a label.

Yes, and this label is also the "ID card" of domestic licensed mobile phones. Similarly, licensed goods bought in China are also called parallel imports in Hong Kong and Macao. Therefore, the "licensed goods" bought here in Hong Kong and Macao are not guaranteed to return to China.

Yes, you must go back to Hong Kong and Macao if you want to repair and upgrade for free in the future. Similarly, no matter how the "licensed" mobile phones outside China reach China, they are all parallel imports, while the licensed ones in China are parallel imports outside China. I believe that many people

I will say, if I buy a mobile phone, I will take good care of it, and I won't ruin it if nothing happens. It is generally unlikely to be repaired. Others: Over time, the LCD screen, cable and keyboard of the mobile phone will wear and tear, even if everyone is well maintained.

It is impossible to complete the upgrade of the mobile phone, and the benefits of the upgrade are self-evident. Of course, some people may say that they will use the mobile phone after buying it, and there is no special requirement for upgrading. Of course, it depends on personal needs. There are many people hugging.

The mobile phones of T6 18 and LG series send short messages too slowly, and some mobile phones will crash frequently, resulting in software failures, especially new mobile phones, which need to be upgraded and maintained at this time.

Especially important. It should be noted that although parallel imports are cheap, they are only relative. It is generally recommended to buy high-end ones, which can be much cheaper. If it is a low-end mobile phone, the price of parallel imports may even be higher than that of licensed products.

Tall man. Hong Kong's mobile phone market is bigger than many places in Guangzhou, Shanghai and Beijing. It deserves to be a shopping paradise, but its inferior products are also a dime a dozen, especially the machines in Golden Computer City and Temple Street. I suggest you buy them.

Be careful, or you'd better not go there to buy it. In addition, it should be noted that mobile phones purchased by Nokia in Macau or Hong Kong can enjoy free maintenance and upgrade at designated maintenance points in the Mainland with invoices, but only for

Only its designated "maintenance point"! But it's also good. You can buy parallel planes and enjoy licensed services, but please remember to take the invoice and warranty card and don't lose it. Besides, licensed goods in Hong Kong are generally excluded.

A few mobile phones, such as BENQ, have simplified Chinese, and others should all be traditional Chinese. If you see a "licensed" version of Simplified Chinese, it is important to note that the machine may have been manually refreshed to change its software.

From the point of view of free maintenance, it is worthwhile to buy licensed products in China, because you can go to Zhuhai to repair or upgrade your mobile phone in Macau, and you can also go to various maintenance points when you return home. And if you buy parallel imports in Macao, then in the future,

In case of free maintenance or upgrade, you must get it to Macau and Hong Kong. However, if you are generally not particularly picky about the functions of mobile phones and buy mobile phones with good reputation such as Nokia and Sony Ericsson, then pick parallel imports.

After all, the machine may never need to be upgraded and maintained. So how to choose parallel imports and licensed products depends on everyone's personal preferences. I say so. Do you have any ideas about parallel imports and licensed products?