13.扫描仪故障（13. scanner failure）.docVIP

13.扫描仪故障（13. scanner failure） Scanner The popularity of scanners is getting higher and higher, but there are more faults in this kind of peripherals, and the reasons for the failures are complicated. In the past, handheld scanners and roller scanners are now not the mainstream of the market, and flatbed scanners are the most popular. In terms of lifetime, flatbed scanners are the longest, followed by roller scanners, and hand scanners are of relatively low service life. This is mainly because the internal structure of the three scanners is different and is caused by different usage. Lets first see how the scanner works. Actually, its very simple. It uses light sources to illuminate the originals or pictures To produce high brightness light reflection, light through the mirror, mirror, color separation by spectroscope, exposure to CCD (charge coupled device, Charge Coupled Device) element, CCD element converts the optical signal into electrical signals transmitted to the computer. Therefore, the key component of the scanner is CCD, and its quality directly affects the performance of the scanner. The scanner is mainly composed of photosensitive device, high-power fluorescent tube, drive motor, drive belt and analog to digital signal converter, in which the photosensitive device works to convert the sensed light signal into electrical signal. A high power light tube used for intense illumination of text or images in order to achieve full induction. The driving motor is used to drive the fluorescent tube, and the light is swept away. The driving belt is a device for driving the fluorescent tube together with the driving motor. An analog to digital signal converter converts analog electrical signals into digital signals for computer identification. The method can determine the fault is the observation method, observed the cause of failure, determine the parts of the problem, such as a scanner no response, can be given to the power line are not connected; can also be test