Scanner is a relatively advanced instrument, which is widely used in many places. But after long-term use, the scanner will have such and such problems. Do you know how to repair the scanner? The following is the related content of "What is the method of maintaining the scanner" that I compiled for you, I hope it will be useful to you!
Method of repairing scanner
First, it is noisy when scanning.
When the scanner works, it produces a lot of vibration, accompanied by a lot of noise, which is caused by the movement of the mechanical part when the scanner works. There are two reasons, one of which is closely related to the scanning speed. According to the specific software of each brand machine, setting the scanning speed to medium or low speed can solve the problem. Second, it is related to the working environment, especially in winter. The slider inside the scanner will dry out and the working noise will increase. The treatment method is very simple, one is to raise the indoor temperature, the other is to open the scanner and drop a few drops of lubricating oil on the slide bar.
Second, the scanning is intermittent.
The scanner scans slowly, and it is difficult to scan intermittently. This may be because the memory is too small, and the scanner scans one part first and then the other. Then go back and connect the two smoothly. There are two solutions: one is to expand the memory; Another method is to adjust or disable virtual memory in Control Panel/System/Performance/Virtual Memory.
Third, the output image color is not bright enough.
If the scanned image is not bright enough, you can adjust the brightness, contrast and gamma value of the display first. Gamma value is the feeling curve of human eyes from dark color to bright color.
The higher the gamma value. The richer the layers of color. You can adjust the gamma value in the scanning application software included with the scanner. Of course, in order to achieve better results, you can also adjust the gamma value in photoshop and other software, but this is an afterthought. You can adjust the gamma value according to the specific situation of scanned photos. In the software that comes with the scanner. For general use, the gray value is usually set to 1.4, and for printing, the gray value is usually set to 1.8. The photo on the web page is set to 2.2. In addition, the scanner should be color corrected before use, otherwise it is likely to distort the scanned image; In addition, you can make specific adjustments to the brightness/contrast options in the Scanner Driver dialog box.
Fourth, the color of the pictures scanned by the scanner is blurred, and some colors are incorrect.
One of the reasons may be that the flat glass of the scanner is dirty. Please clean this glass with a clean cloth or paper. Be careful not to wipe with alcohol and other liquids, which will make the scanned image appear rainbow color.
The second reason is that the resolution setting is unreasonable. First check the resolution used by the scanner. For example, 300dp), images scanned by scanners above 1200dpi will be blurred. Because a 300dpi scanner scans 4200dpi, it is equivalent to enlarging a point to twice the size of the screen.
The third reason is that the monitor is not set correctly. Check and set the display to 16-bit color or higher.
Selection skills of scanner
I. Brand
Second, the performance parameters
There are many parameters that describe the performance of the scanner. The following are the technical indicators that ordinary users need to consider when purchasing.
1. scanning format: scanning format usually has A4, A4 extension, A3, A 1, A0 and other specifications. Large format scanner is expensive, so it is recommended that ordinary family and office users choose A4 format scanner. According to needs, office users can also consider buying scanners with A3 format or even larger format.
2. Resolution: Resolution reflects the clarity of the scanned image. The higher the resolution of the scanner, the clearer the scanned image. The resolution of the scanner is expressed in dots per inch (dpi). General office users suggest buying a scanner with a resolution of 600× 1200 (horizontal resolution× vertical resolution). The horizontal resolution is determined by the real resolution of the scanner optical system, and the vertical resolution is determined by the accuracy of the scanner transmission mechanism. The horizontal resolution is mainly considered when purchasing.
3. Number of color bits: The number of color bits reflects the ability to distinguish colors of scanned images. The more color bits, the richer the color of the scanned image. The number of color digits is represented by binary digits. For example, an image of 1 bit, each pixel can carry binary information of 1 bit, and only two colors can be produced: black or white. An 8-bit image can give each pixel 8 bits of binary information, which can produce 256 colors. Common scanners have common standards such as 24-bit, 30-bit, 36-bit and 42-bit color bits. It is recommended to buy a scanner with 30-bit color or 36-bit color. 30-bit scanners have become obsolete products, and it is recommended not to buy them.
4. photosensitive element: the photosensitive element is the eye of the scanner, and the scanning quality is related to cutting with the photosensitive element. The useful photosensitive elements of ordinary scanners are CCD (Charge Coupled Device) and CIS (Contact Imaging Sensor). The scanning technology of CCD photosensitive element has matured. It is matched with an imaging system consisting of a light source, several mirrors and an optical lens to image on the sensor surface, which has a certain depth of field and can scan uneven objects. CIS is a kind of photosensitive element widely used in fax machines. Its ultimate resolution is about 600DPI, which is far from CCD technology. CIS is only used for low-grade flat-panel scanners.
Third, support software.
The function of scanner must be realized by corresponding software. In addition to the driver and scanning interface, almost every scanner will give away some image editing software, OCR text recognition software and so on. Different scanning distribution software has different performance and operation methods. For users who are not familiar with graphic processing, it is recommended to choose a scanner with simple operation and convenient use.
Fourth, the interface
Interface refers to the connection mode between the scanner and the computer, such as SCSI interface, EPP interface and USB interface.
The SCSI interface scanner is connected to the computer through the SCSI interface card, and the data transmission speed is fast. Disadvantages are complicated installation, need for expansion slots and limited computer resources (interrupt number and address). If you often scan a large number of drawings, you should choose SISC interface scanner, which can save a lot of time.
EPP interface (printer parallel port) can connect scanners, printers and computers with cables, and the installation is simple. You can connect a laptop. However, its data transmission speed is slightly slower than that of SCSI interface scanner, so it is recommended that users who do not require high scanning speed, do not scan much, and do not often use scanners buy EPP interface scanners.
USB interface scanner is fast, supports plug and play, and is very convenient to connect with computer. However, your computer is required to support USB interface, and it is recommended that qualified users buy USB.
Maintenance method of scanner
1. Protect optical components.
In the process of scanning images, the scanner converts analog signals into digital signals through an element called photoelectric converter, and then sends them to the computer. This photoelectric conversion setting is very fine, and the position of optical lens or reflective lens has a great influence on scanning quality. Therefore, in the process of work, do not change the position of these optical devices casually, and try to avoid shaking or tilting the scanner. Encounter a sweep
When the tracer fails, don't dismantle and repair it without authorization, but send it to the manufacturer or the designated maintenance station; In addition, when transporting the scanner, the security lock on the back of the scanner must be locked to avoid changing the position of the optical accessories.
2. Do cleaning work regularly.
Scanner can be said to be a kind of exquisite equipment, so we must do a good job of cleaning at ordinary times. If dust or other impurities fall on the glass plate, reflector and lens in the scanner, the reflected light of the scanner will be weakened, thus affecting the scanning quality of the picture. For this reason, be sure to use the scanner in a dust-free or dust-free environment. After use, be sure to cover the scanner with a dust cover to prevent more dust from invading. When it is not used for a long time, it should be cleaned regularly. When cleaning, you can first wipe off the dust on the shell with a soft fine cloth, and then carefully clean it with detergent and water. Then clean the glass plate, because the cleanliness of the panel is directly related to the scanning quality of the image, so when cleaning the panel, wipe it with glass cleaner first and then dry it with a soft dry cloth.
The fault of the scanner is clear and not complicated. Scanner mainly includes motherboard and scanning components, and the power supply is usually peripheral power supply equipment. In general, the failure rate of scanning components is very high.
Repair and maintenance skills of scanner
Scanner is an input device widely used in computers. As a high-tech product of photoelectric and mechanical integration, it is our common office equipment, but once it breaks down, it will make us helpless. Some faults need professional maintenance, and many faults can be eliminated by themselves. Here are some common troubleshooting methods for everyone:
I. Disassembly of Scanner
It is often necessary to disassemble the scanner during maintenance, so first of all, let me introduce the basic methods of disassembling the scanner:
1. First, remove the glass platform, use a Phillips screwdriver to reach into the round hole and unscrew the screws, and then remove the top cover and glass platform upward. After opening the scanner, you can see the stepping motor, conveyor belt, scanning head and circuit board. In some scanners, the upper and lower parts are connected by plastic buttons instead of screws. When disassembling, pry open the plastic buckle with a crew cut screwdriver to separate the upper and lower parts. When prying open the plastic buckle, move lightly to avoid damaging the plastic parts.
2. Unplug the data cord. Generally, there are two circuit boards in the scanner, one is fixed behind the scanning head and the other is installed behind the scanner. The two circuit boards are connected by a data flexible cable. Remove the data flexible cable before removing the scan head. The data flexible cable is stuck in the cable slot on the circuit board. When removing the flexible cable, the pins on both sides of the cable trough should be pulled out first, and then the flexible cable can be easily pulled out.
3. Remove the scanning head. Most of the scanning heads pass through the circular metal rod (guide rail) and are driven by the transmission belt to move along the longitudinal direction of the scanner. Just take the round metal rod out of the plastic holder on the base to separate the scanning head from the conveyor belt, so that the scanning head and the round metal rod can be taken out upwards, and then the round metal rod can be pulled out of the scanning head.
4. Remove the lamp tube. The lamp tube is located at the top of the scanning head, horizontally placed along the scanning head, clamped on the plastic card seats at both sides of the scanning head, and its power plug is inserted into the circuit board at the back side of the scanning head. Just unplug the power plug of the lamp on the circuit board, and the lamp can be removed from the scanning head. The thinnest lamp tube is only the thickness of a matchstick, so be careful when disassembling it.
5. Remove the circuit board. Unscrew two screws and remove the circuit board on the scanning head, and you can see the CCD device in the dual in-line package on the front of the circuit board. Because CCD devices need to face the optical lens in the scanning optical path, improper installation and repair will affect the scanning quality. It is recommended not to disassemble the circuit board on the scanning head at will.
Second, the common fault causes and troubleshooting methods
1. Only a small part of the whole image was obtained.
Causes and troubleshooting: the focus rectangular frame still stays on the preview image; Only the area inside the rectangular box is obtained. Click to remove the focus rectangle after focusing, and try to get the image repeatedly.
2. There are too many patterns in the image (noise interference)
Causes and elimination methods: The humidity of the scanner's working environment exceeds its allowable range (it may be that the scanner is stored or transported beyond its allowable range). Let the scanner work within the allowable range. Turn off the computer, then turn off the scanner, then turn on the scanner, and then turn on the computer to recalibrate the scanner.
3. The original color is too different from the screen color.
Troubleshooting: (1) Check whether the chromaticity, brightness and contrast settings of the screen meet the normal requirements.
(2) Check whether the screen setting options of ColorLinks are correct.
(3) If FotoLook is executed in Photoshop, please check whether the file preference monitor settings, print link settings and separation settings are correct.
(4) If all the above settings are correct, you can correct the color between the scanner and the display screen.
4. The whole scanned image is distorted or blurred.
Troubleshooting: (1) The glass plate of the scanner is dirty or the mirror bar is dirty; Wipe the glass plate with a soft cloth and clean the reflective tape.
(2) The scanned original document is not always pasted on the document table; Make sure that the scanned original is always flat on the platform.
(3) Ensure that files are not moved during scanning.
(4) The scanner vibrates due to uneven placement during scanning; Carefully place the scanner on a smooth surface.
(5) Adjust the exposure setting or "gamma" setting of the software.
(6) If the parallel port scanner has the above situation, there may be something wrong with the transmission cable. It is recommended to use high-performance cables above IEEE- 1284.
5. When the scanned image is displayed on the screen or printed, the dotted line is always lost.
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 it.
(3) For the optical lens of the scanner, it is best to use a special small vacuum cleaner for dust removal.
(4) Check whether the white correction bar on the scanner housing is dirty and needs to be cleaned in time.
(5) Check whether the document glass is dirty or scratched. Clean the scanner thoroughly or replace the document glass regularly to avoid this situation. In the latter case, you should contact the local authorized technical service center.
6. When scanning printed matter, moire fringe (cross image) appears in a specific area of the image.
Reasons and elimination methods: First, let's understand the simple principle of color printed matter imaging. Try to look at ordinary color prints with a magnifying glass. In fact, any picture and text are composed of four colors: cyan, magenta, yellow and black, which is what people often say. These colors are tiny ink dots (good color printing should have a resolution of 1200dpi). The arrangement and combination of ink dots will make the eyes have an illusion. For example, if there are more red ink spots in a certain area, the visual system of the human brain will think that this area is red. This tiny point will be detected by sensitive photosensitive elements during scanning, so the scanning result will make all kinds of lines appear in the whole picture, which will seriously affect the quality of the scanned image. The following scheme can be adopted to avoid the appearance of turtle grain.
(1) Select the Color Photo (Mesh) setting in Image Type, or select the Mesh setting in the Image Type dialog box.
(2) Place a piece of transparent paper between the document and the manuscript table to defocus the image.
(3) Correctly locate the image.
(4) The image size can be slightly reduced.
(5) Select the Clear Edge Clear checkbox in TWAIN of the scanner.
Complete set of scanner maintenance skills
As an image input device, scanner has spread to thousands of households, and how to maintain it correctly in use is also a problem worthy of attention. Today, the editor will introduce you to the places that need attention in the daily maintenance of scanners.
1, do not hot plug the data transmission line at will. General household scanners are EPP interfaces. After the scanner is powered on, if the data transmission line of the interface is hot-plugged at will, the interface of the scanner or computer will be damaged, and it will be more troublesome to replace it. Please don't do this, even if you try, no problem.
2, don't often plug the power cord and scanner connector. Often plugging and unplugging the connector between the power cord and the scanner will lead to poor contact at the connection, which will lead to the impassability of the circuit and be very troublesome to maintain. The correct way to cut off power should be to unplug the plug-in power converter on the power socket.
Don't cut off the power halfway. Because the lens group moves slowly at work, it takes some time to return to the bottom after scanning an image, so don't cut off the power supply in the middle of normal power supply, and then cut off the power supply after the scanner lens group returns completely. At present, some scanners have locked the lens group to prevent vibration during transportation, which shows how important the return of the lens group is to protect the lens group.
4. When placing items, locate them accurately at one time. Some models of scanners can scan small three-dimensional objects. When using this kind of scanner, we should pay attention to: when placing items, we should position them accurately at one time, do not move them casually to avoid scratching the glass, and do not move them when scanning.
5. Don't put items on the scanner. Due to the limitation of office or home space and the large space occupied by the scanner, some users often put some items on the scanner for a long time, and the plastic cover of the scanner will be deformed due to hollow compression, which will affect the use.
6. Please cut off the power supply when not used for a long time. Some scanners are not designed to completely cut off the power switch when not in use. When they are not used for a long time, the picture tube of the scanner is still on. Because the lamp tube of the scanner is also a consumable, users are advised to cut off the power supply when not in use for a long time.
7. It is recommended not to use the scanner near the window. Because the scanner will generate static electricity when it works, it will suck dust into the body for a long time, which will affect the work of the lens group. So try not to use scanners near windows or places where dust is easily adsorbed. In addition, keep the humidity of the scanner environment and reduce the influence of floating dust on the scanner.
8. Maintenance of mechanical parts. After the scanner is used for a long time, it is necessary to take off the cover, wipe the oil stains on the two tracks of the mirror set with cotton cloth soaked with sewing machine oil, and then drop a proper amount of sewing machine oil on the bearings at both ends of the transmission gear set and belt. In the end, you will find that the noise is much less.
What is the maintenance test of the scanner?
Let me introduce the maintenance and detection methods of the scanner to you first, hoping to help you. The popularity of scanners is getting higher and higher, but there are also many failures of such peripherals, and the reasons for the failures are also more complicated. The former hand-held scanner and roller scanner are not the mainstream of the market now, and the flat-panel scanner is the most popular. As far as the service life is concerned, the flat scanner is the longest, followed by the drum scanner, and the service life of the handheld scanner is relatively short. This is mainly because these three scanners have different internal structures and different ways of use. Let's first understand the working mode of the scanner. It's actually quite simple. It uses a light source to illuminate manuscripts or pictures, producing high-brightness reflected light. The light passes through a reflecting mirror and a transmitting mirror, the color is separated by a spectroscope, and the light shines on a CCD (ChargeCoupledDevice) element. The CCD element converts optical signals into electrical signals and transmits them to the computer. Therefore, the key accessory of scanner is CCD, and its quality directly affects the performance of scanner. The scanner is mainly composed of a photosensitive device, a high-power fluorescent tube, a driving motor, a transmission belt and an analog-to-digital signal converter, wherein the photosensitive device converts the sensed optical signal into an electrical signal. High-power lamp is used for intense irradiation of characters or images to achieve complete induction. The function of the driving motor is to drive the fluorescent tube, so that the light can sweep the needed articles step by step. Transmission belt is a device that drives fluorescent tubes together with a driving motor. An analog-to-digital signal converter converts analog electrical signals into digital signals recognized by a computer. The method to determine the fault can be to observe and observe the cause of the fault, and to determine that the fault part, such as the scanner, is unresponsive, and whether the power cord is connected properly can be considered; It can also be a test method, which determines the problematic place through testing, such as scanning a picture and finding that the scanned image is not clear enough; There is also a screening method, which can further determine the fault location when several components that may cause faults are found by observation. Sometimes, through more methods, the source of the fault can be determined and then the solution can be sought. The scanner could not be found. I believe this is the most common failure. First observe whether the power supply and line interface of the scanner are connected properly, and then confirm whether the power supply of the scanner is turned on before starting the computer. If not, you can press the "Refresh" button of Windows Device Manager to check whether the scanner has self-check and whether the green indicator light is always on. If the answer is yes, we can rule out the possibility of the scanner itself. If the indicator light of the scanner keeps flashing, it means that the scanner is not in a normal state. At this point, you can reinstall the latest scanner driver. At the same time, check whether the scanner in Device Manager conflicts with other devices (IRQ or I/O address), and make changes if there is any conflict. Remember, this kind of fault is nothing more than line problem, drive problem and port conflict problem. The scanner is not ready. After turning on the power of the scanner, if the ready light does not light up, first check the internal light of the scanner. If the internal light is found to be on, it may be related to the room temperature. The solution is to turn off the scanner after half an hour of power supply and turn it on again after one minute, and the problem can be solved. If the scanner still doesn't work at this time, please turn off the scanner first, disconnect the scanner from the computer, set the value of SCSIID to 7, and then turn on the scanner after about one minute. When the temperature is low in winter, it is best to preheat it for a few minutes before using it to avoid the phenomenon that the ready light does not light up after booting. The color of the scanned image is blurred. First, observe whether the flat glass on the scanner is dirty. If yes, please wipe the glass with a clean cloth or paper, and be careful not to wipe it with alcohol and other liquids, which will make the scanned image appear rainbow color. If it is not glass, please check the resolution used by the scanner. For example, the image scanned by a 300dpi scanner will be blurred if it exceeds 1200dpi. Because a 300 dpi scanner scanning 1200dpi is equivalent to quadrupling one point. In addition, please check whether the monitor setting is 16-bit color or above. If you scan some printed matter, it is understandable that there are some blurs caused by mesh. The processing method can be processed by the scanner's own software, or by image software such as Photoshop. The color of the output image is not gorgeous enough, which is also a software fault. You can adjust the brightness, contrast and gray value of the display first. Gamma value is the feeling curve of human eyes from dark color to bright color. The higher the gamma value, the richer the perceived color levels. We can adjust the gamma value. Of course, in order to get better results, you can also adjust the Gamma value in Photoshop and other software, but this is an "after-the-fact adjustment", and we can adjust the Gamma value according to the specific situation of scanned photos. In the software that comes with the scanner, if it is for general use, the Gamma value is usually set to1.4; If it is used for printing, it is set to1.8; The photo on the web page is set to 2.2. In addition, the scanner should be color corrected before use, otherwise it is likely to distort the scanned image; In addition, you can specifically adjust the brightness/contrast options in the scanner driver dialog box. Scanner problems usually come from scanning effect, which is often one of software faults. For these software failures, different scanners have different solutions, and related software can be used to correct them. Hardware failures are mainly interface and line problems. As long as you connect the lines, set up the ports and use the latest drivers, these problems should be easily solved.