Common application methods and fault analysis of t

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Common application methods and fault analysis of scanner (II)

II. Common fault causes and troubleshooting 1 Only a small part of the whole image is obtained

Troubleshooting: the focus rectangle still stays on the preview image; Only the area within the rectangle is obtained. After focusing, click to remove the focusing rectangle and try again and again to get the image

2. There are too many patterns in the image (noise interference)

Troubleshooting: the humidity of the scanner's working environment exceeds its allowable range (maybe the scanner is stored or transported outside the allowable range). Let the scanner work within the allowable range. Turn off the computer, then turn off the scanner, then turn on the scanner first, and then turn on the computer to recalibrate the scanner

3. The difference between the original color and the screen color is too large


(1) check whether the settings of the chromaticity, brightness and contrast of the screen meet the normal requirements

(2) check whether the screen setting options of colorlinks are correct

(3) if fotolook is implemented under Photoshop by plug-in, please check whether the second feature of file prefe, values monitor setup, printing Lnks setup and seperation setup, are correct

(4) assuming the above settings are correct, you can make a color correction between the scanner and the display screen

4. The key technology in the design of the scanned spring testing machine the whole image is deformed or blurred

fault causes and Troubleshooting:

(1) the scanner glass plate is dirty or the reflector strip is dirty; Wipe the glass plate with a soft cloth and clean the reflector strip

(2) the scanned original document is not always pasted flat on the document desk; Make sure that the scanned original is always flat on the platform

(3) make sure not to move files during scanning

(4) the scanner vibrates due to uneven placement during scanning; Pay attention to placing the scanner on a stable surface

(5) adjust the exposure setting or "gamma" setting of the software

(6) if the above happens to the parallel port scanner, there may be a problem with the transmission cable. It is recommended to use a high-performance cable above ieee-1284

5. The scanned image always loses dots and lines when it is displayed on the screen or printed out

fault causes and Troubleshooting: (1) check whether the sensor of the scanner is faulty or the paper guide mechanism of the automatic document feeder is faulty, and find a professional to check and repair

(2) dust removal is done for the optical lens of scanning 2 and opening the oil delivery valve instrument, and the effect is best with a special small dust collector

(3) check whether the white correction strip on the scanner cover is dirty and need to be cleaned in time

(4) check whether the platen glass is dirty or scratched. You can regularly and thoroughly clean the scanner or replace the platen glass to avoid this. In the latter case, contact the local authorized technical service center

6. When scanning a print, moire (cross image) appears in a specific area of the image

Troubleshooting: first, let's understand the simple principle of color print imaging. Try to take a magnifying glass to observe general color printed matter. In fact, any picture and text are composed of four colors, namely cyan, magenta, yellow and black, which are often mentioned. These colors are very small ink dots. The arrangement and combination of ink dots can make the eyes have an illusion. For example, if there are more red ink dots in a certain area, the human brain's visual system will think that this area is red. Such tiny points will be detected by sensitive photosensitive components during scanning, so the scanning result will make the whole picture have various lines, which will seriously affect the quality of the scanned image. The following schemes can be adopted to avoid moire

(1) select the "color photo" (de texturing) setting in the "image type" or the "de texturing" setting in the "image type" dialog box

(2) place a transparent page between the document and the platen to defocus the image

(3) locate the image correctly

(4) the image size can be slightly reduced

(5) select the "clear edge sharpening" check box in the twain of the scanner

it is not only necessary to fundamentally transform the plastic granulator process

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