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I have repeatedly encountered the mouse automatically flying problem, I believe other friends have come across. This is a small problem, it may create a lot of trouble to you, here I am, with theoretical and practical analysis to solve this problem.

　　First, let’s talk about software failure. At this point, we immediately think of the infected system, or the mouse driver is in conflict with the operating system. But there is a reason, not everyone may come across that you have a Trojan horse, a remote control system for others. On such issues, it is recommended to use a floppy disk in DOS antivirus, if valid, then please reinstall the system right. Also, if your computer is often the Internet, it is recommended to download THE CLEAN software to killing Trojans.

　　Next we turn to more complex hardware failure. First, we should familiarize yourself with the mechanical mouse works: by moving the mouse to drive the rubber ball, rubber ball rolling and friction within the mouse in charge of horizontal and vertical directions of the wheel roller gate, drive gate rotating wheel. Gate along the grid-shaped wheel round. Close to the gate round grill on both sides, one side is an infrared LED, the other side is the infrared receiver module. Infrared receiver module for a three-terminal device, which contains two infrared receiver B. The angle between the horizontal and vertical grid wheel is pressed on the direction of a wheel, it makes rubber ball no matter what direction to scroll are always pressed on the axle in the two gate.

　　By ps / 2 port or serial port connected to the host. Interface uses four lines, respectively, for the power, ground, clock and data. Normal working hours, the mouse moves into a different horizontal and vertical grid direction and speed of the wheel rotation. Rotation gate wheel, gate wheel teeth periodically block the infrared LED emitted infrared radiation to the receiving component of a pipe and tube B, A and B output to the output electrical pulse to the mouse to control the chip. As the infrared receiver components A and B two vertically aligned, gate wheel teeth caught in the middle of the infrared transmitter and receiver part of the direction of movement up and down direction, while the B receiver tube and the infrared emission tube angle is not zero, so the tube B output of the electrical pulse has a phase difference. Mouse to control the chip skew by this sub-horizontal or vertical grid round to know the direction of rotation, the frequency of the pulse through the gate known sub-wheel rotation speed, and continue through the data transmission to the host mouse line information, the host through the process so that the screen synchronization with the mouse cursor on the move.

　　When the computer starts, windows mouse through the interface initialization. If the mouse cable has a broken line, the host will give the mouse is not installed, please install the mouse off the information. If you unplug the mouse using the mouse cable connector or bad, the mouse system paralysis dead.
Know the basic working principle of the mouse, let’s discuss why the mouse pointer flying diffuse screen:
Description of the mouse pointer moves to the host through the serial data line to send the mouse to move information, but this time they did not move the mouse, move the mouse chip, how will issue data? The reason is that the mouse in the infrared emission tube and gate sprocket and the infrared receiver relative position between the three components properly, plus the host power supply voltage sent through the interface match well with the mouse. A time when a mouse wheel just stopped at the gate to receive the two components A and B produce the same voltage position, and this voltage happens to be the mouse chip identification signal light and dark to determine the threshold voltage, that is, the voltage may been identified as the mouse chip light may also be identified as dark. If the chip of a mouse at this time identified as a light pipe output signal B output tube dark signal, the mouse so the signal processing, and handling of the chip components A and B will cause the receiver to receive the output voltage and control the mouse chip for light determine the threshold of the dark minor changes. Because the mouse chip is clocked digital circuit, it also signals recognition clock cycle, the moment when the arrival of an identification cycle, the determine the result will be a B for the light to dark. At this point, the mouse chip results identified two different identification cycle, so the chip reached the gate wheel rotation information. This process cycle, then the pointer moves to a direction in which the uniform until the screen edge.

　　The key is to host the supply voltage fed to the mouse to control the mouse in an infrared emission emitted infrared light sensitive components A and B in the two optical signals generated by light-sensitive tube voltage just distinguish light and dark in the mouse chip identification signal cut-off threshold point . This is very coincidental, so the appearance of the mouse pointer swimming is also very random, and sometimes may not appear a few days, and sometimes frequent. This failure generally occurs only in one direction. Because of the failure and the host interface output power is also a relationship, it may be a failure on one machine to another machine on the mouse work properly. Test large - the largest educational website (www.Examda. Com)Hardware solution: first check there is no hardware conflicts (such as Modem and other peripherals) and then try to check your mouse interface pins are bent, broken: Then, open the mouse to see if there is dirt inside the winding or anti-twist? To clear and then try. Or, change to another computer to try to see if the fault persists, there is no hardware failure given the information. Still does not work, only the corresponding failure to adjust the direction of the infrared emission control, infrared receiver module and the relative position of the gate wheel, see if you can recover. Last resort altogether forget to buy new.