Fourteen, scanner
The penetration rate of the scanner is getting higher and higher, but this type of peripheral is more fault, and the cause of the fault is more complicated. In the past, the hand-held scanner, the drum scanner is now the mainstream of the market, and the flat scanner is the most popular. For the service life, the flat scanner is the longest, followed by a roller scanner, and the service life of the hand-held scanner is relatively low. This is mainly because the internal structures of these three scanners are different, and the use methods are different.
Let's first understand the way the scanner is working. It is actually very simple, which is to generate high-brightness reflected light by light source irradiation or picture. The light is collected by a mirror, a transmissive, and irradiated to a CCD (charge coupling) Devices, CHARGE COPLED DEVICEs, CCD components convert the optical signal into electrical signals, transferred to the computer. Therefore, the key accessories of the scanner are CCDs, and its quality directly affects the performance of the scanner.
The scanner is mainly composed of photosensitive devices, high-power daylight tubes, drive motors, drive belts, analog to digital signal converters, wherein the photoreceptor of the photosensitive device is to convert the induced optical signal into an electrical signal. High-power tubes are used to perform strong illumination of text or images to achieve full induction. The effect of the drive motor is to drive the sunlight tube to scree a step-off item. The drive belt is a device that drives a fluid tube along a driving motor. The analog to digital signal converter is also converting analog electrical signal into a digital signal for computer recognition.
The method of determining the fault can be a observation method, observing the cause of the fault, determines if there is a problem, such as the scanner does not respond, can take into account the power cord is not connected; or the test method, test, determine if there is a problem Place, such as scanning a picture, found that the scanned image is not clear enough; there is a screening method, when it is found when it is observed, there are several components that may cause a failure, and the filtering method can be used to further determine the fault location. Sometimes you use some methods, you can determine the source of the fault and then seek a solution.
Common fault one: I can't find a scanner
I believe this is the most common fault. First see if the scanner's power supply and the line interface have been connected, and then confirm whether the power of the scanner is turned on before starting the computer. If not, you can press the "Refresh" button of the Windows "Device Manager" to see if the scanner has self-test, whether the green indicator is stable. If the answer is affirmative, the possibility of the scanner itself can be excluded. If the scanner indicator keeps flicker, the status of the scanner is not normal. At this time, you can reinstall the latest scanner drivers. At the same time, it should also be checked whether the scanner conflict with other devices (IRQ or I / O address) in "Device Manager", if there is a conflict. Remember, this type of failure is nothing more than line issues, driver issues and port conflicts.
Common faults 2: Scanners are not ready
Once the scanner is turned on, if the ready light is not lit, check the internal lamp in the scanner. If the internal lamp is lit, it may be related to room temperature. The solution is to let the scanner turn off the scanner after half an hour. After a minute, open it again, the problem can be solved. If the scanner still does not work, then turn off the scanner, disconnect the connection between the scanner and the computer, set the value of the SCSI ID to 7, and turn the scanner after approximately one minute. When the temperature is low in winter, it is best to preheat for a few minutes before use, so it can avoid the phenomenon of unlighten the Ready lamp after boot.
Common fault three: Scanned picture color blur
First, the flat glass on the scanner is dirty through the observation method. If so, please clean the glass with a clean cloth or paper. Be careful not to rub the liquid in alcohol, which will make the scanned image Rainbow color. If it is not a glass, please check the resolution used by the scanner, such as 300dpi scanner sweeping 1200dpi image is blurred. Because 300DPI scanner scanning 1200dpi is equivalent to a little more than four times. Also, check if the display setting is 16 bit color or more. If you are scan some prints, the blurred vaguely caused by a certain network is understood, and the processing method can be used with the software itself with the scanner itself, or the image software such as Photoshop can also be processed. Common fault four: output image color is not enough
In the event of this fault, we first adjust the brightness, contrast, and GAMMA value of the display. The higher the gamma value, the more the level of feeling color is. We can adjust the gamma value. Of course, in order to seek a better effect, you can also adjust the gamma value in software such as Photoshop, but this is "post-adjustment", we can adjust the GAMMA value according to the specific situation of the photo. In the software comes with the scanner, if it is common use, the GAMMA value is usually set to 1.4; if it is used to print, set to 1.8; the photo on the web page is set to 2.2. In addition, the scanner should make color correction before use, otherwise it is possible to distortion of the scanned image; in addition, the brightness / contrast option in the Scanner Driver dialog box can also be specifically adjusted.
The problem of the scanner usually comes from scanning effects, which is often one of the software failures. Different scanners have different solutions to these software failures, and they can be corrected using relevant software. The hardware failure is mainly interface, line issues, as long as everyone connects the line, sets the port, use the latest drivers, these issues should be easily solved.
