U disk maintenance of some basic knowledge

U disk Repair is a careful thing, the following will explain its fault diagnosis methods and maintenance ideas:

(The following failures in maintenance, the first to exclude the USB interface damage and PCB board virtual welding, and USB extension cord normal conditions, and then repair the judgment)

1, u disk inserted into the machine without any reaction

Maintenance ideas: According to the fault of the judge, U consolidation machine does not work, and U disk tools to be equipped with the necessary conditions is the focus of our maintenance. Regardless of any scheme of the U disk you want the tool must have the following conditions:

(1) power supply, divided into the main control of the required power supply and flash required power, these two are the key, and the U disk circuit is very simple, such as no power supply is generally the insurance inductance damage or damage to the 3.3V voltage regulator block, said the voltage regulator here also said, its three pins are power input (5V), ground, power output ( 3.3, the working principle is that when the input foot input a 5V voltage, the output foot will output a stable 3.3V. As long as we find out where there is no source of power, the problem will be solved well.

(2) The clock, because the main control to work at a certain frequency, with flash communication also * clock signal transmission, so if the clock signal does not, the main control will not work. And in the examination of this circuit, in fact, the clock generation circuit is very simple, only need to check the crystal oscillator and its peripheral circuit can be, because the crystal is afraid of brush and U disk compact very easy to fall on the ground caused by crystal damage, as long as the replacement of the same crystal vibration can be. Note: Crystal oscillator is not measurable, the best way to judge its quality is to replace a good crystal vibration to judge.

(3) Master, if the above two conditions are normal that is the main control chip damage. Just change the main control.

2, U disk inserted into the computer, prompted "unrecognized equipment."

Maintenance ideas: For this phenomenon, the first point that the U disk circuit is basically normal, but only with the computer communication problems, and the communication has the following points to check:

(1) U disk Interface circuit, this circuit does not have any special components is two data line d+ D, so when checking this circuit as long as the data line to the main control between the line is normal, generally in the data line and the main control circuit will be strung between two small resistance resistors, to play a protective role, So check the resistance of these two resistors is normal.

(2) clock circuit, because U disk and computer communication to be in a certain frequency, if the U disk work frequency and computer can not sync, then the system will consider this is an "unrecognized device." At this point will change the crystal vibration. and the actual repair there are many examples of crystal vibration damage!

(3) Master control, if the above two-point inspection is normal, then you can judge the main control damage.

3, you can recognize U disk, but open the prompt "disk has not been formatted" but the system can not be formatted, or prompted "Please insert Disk", open U drive inside are garbled, capacity and itself does not match.

Maintenance ideas: For this phenomenon, you can judge the U disk itself hardware is not too big problem, but the software problem.

Workaround: Find the Repair tool for the master scheme and get it done. This will everyone to see the main control of the U disk is what the plan to decide.

U disk failure is probably the main problem. And for the inability to write files, not storage, and other phenomena, are generally bad flash performance or bad block caused. Do you have a clear idea after reading? Casually explained, u disk is different from MP3, he does not exist in the firmware, but some manufacturers put their own software into the inside, low lattice will not be.

U disk (USB) Common fault type:

Insert U disk (USB) There is a letter, but it is not open, double-click the letter prompts "Please insert the disk into the drive"

Incorrectly formatted

Mistakenly deleted

Hint unformatted

Do not recognize a plate

CRC error

Once the data crisis, to maintain a leisurely state of mind is very important, otherwise rush will likely cause greater damage, and thus irreparable. In Search of u disk (USB) Data recovery service Provider's help, we recommend that you first try some of the conventional remedies. But all this has to be done on a reasonable basis, or it could cause two damage to the data.

U disk (USB) data recovery software:

Commonly used for general data recovery software can be a simple USB disk (USB) data recovery work, such as: Easy RECOVERY,FIANL data, recovery 4, and so on.

How to restore U disk (USB) data:

specific to the U disk (USB) Data recovery method Here is not detailed elaboration, you can search engines to find the above mentioned conventional data recovery software, according to its specific use methods for data recovery work.

U disk (USB) repair of the common software download:

U disk (USB) repair of commonly used software are: mformat,uformat,usboot, and so on, specific software download address please refer to this site related software download.

U disk (USB) data Repair Repair experience:

Below on the friends are very concerned about also difficult to learn a technology to everyone to do a simple introduction, a lot of friends ask us to understand the U disk (USB) data recovery methods, The following summary of the method to be introduced to meet the lack of professional data recovery equipment maintenance personnel Reference: Many people have encountered the request for data recovery customers, but they do not have a clear method, the following case on the U disk (USB) data recovery of the specific methods to explain:

Case one: There is a customer request for the U disk data recovery capacity of 256m, the customer to get the U disk access to the computer without any reflection! Because the internal engineering of the CAD drawing is very important

1, open u disk (USB) is packaged as a whole, customer requirements as long as the data, so the shell does not need to be considered, after the disassembly of the main control of the use of I5062 program specific as follows:

(1) Power supply: Check VCC main power supply voltage is normal (vcc=3v power supply is the key voltage for u disk work)

(2) Clock: By measuring the clock crystal two feet have about 0.8v voltage, the preliminary judgment clock circuit normal, using substitution method to replace the crystal oscillator failure is still (clock signal is the inevitable condition of the main control work) _ vgtm& V

(3) Communication: Through the above two points of measurement, preliminary judgement of power supply and clock are normal, mainly check the communication line is normal, check and D to the main control line is also normal!