Description of the problem:
Who can tell me several kinds of different printers and scanners testing and repair!!!! Detailed good!
Answer:
About the printer has a laser, inkjet and needle a moment to tell the end is too difficult, the first to introduce you to the scanner repair and testing methods, I hope to help you.
The popularity of the scanner is getting higher and higher, but this kind of peripheral failure is also more, and the cause of failure is more complex. In the past, handheld scanners and drum scanners are not the mainstream of the market now, and flatbed scanners are the most popular. As far as service life is concerned, flatbed scanners are the longest, followed by drum scanners, and handheld scanners have a relatively low service life. This is mainly due to the fact that these three scanners have different internal structures and are used in different ways.
We first understand the way the scanner works, in fact, it is very simple, is the use of light irradiation of the original manuscript or picture to produce a high-brightness reflection of light, light through the reflector, transmission mirror, by the spectroscope color separation, irradiation to the CCD (Charge Coupled Device, Charge Coupled Device) components, the CCD components will be converted to optical signals, electrical signals, transmitted to the computer. CCD components convert the optical signal into an electrical signal, transmitted to the computer. Therefore, the key accessory of the scanner is the CCD, and its quality directly affects the performance of the scanner.
The scanner is mainly composed of a photoreceptor, a high-power fluorescent tube, a drive motor, a drive belt, and an analog-to-digital signal converter, where the photoreceptor's job is to convert the sensed light signal into an electrical signal. The high power fluorescent tube is used to irradiate the text or image strongly to achieve the role of complete sensing. The drive motor is used to drive the fluorescent tube to sweep the light step by step over the desired items. The drive belt is the device that drives the fluorescent tube along with the drive motor. An analog-to-digital signal converter is a device that converts analog electrical signals into digital signals for computer recognition.
The method of determining the fault can be the observation method, to observe the cause of the failure, to determine the problematic components, such as the scanner does not respond, you can take into account the power cord is not connected; can also be the test method, test, to determine the problematic areas, such as scanning a picture, and found that the scanned image is not clear enough; and filtering method, when using the observation method, found that it may lead to a failure of several components, you can use the filtering method to identify the problematic areas. There is also the screening method, when the observation method reveals that there are several components that may cause the fault, the screening method can be used to further determine the faulty part. Sometimes more than one method, you can determine the source of the problem, and then seek a solution.
Can't find the scanner
I believe this is the most common failure. First, use the observation method to see if the scanner's power supply and line interface have been connected, and then confirm whether the scanner's power is turned on before starting the computer. If not, you can press the Windows "Device Manager" "Refresh" button to see if the scanner has a self-test, the green light is steady on. If the answer is yes, you can rule out the possibility that the scanner itself is malfunctioning. If the scanner's light keeps blinking, it indicates that the scanner's status is not normal. At this point, you can reinstall the latest scanner driver. At the same time, you should also check the "Device Manager" in the scanner and other devices whether the conflict (IRQ or I / O address), if there is a conflict to be changed. Remember, this type of failure is simply a matter of wiring, driver issues, and port conflicts.
The scanner is not ready
When you turn on the scanner, if you find that the Ready light is not on, check the scanner's internal lamps first. If you find that the internal lamp is on, it may be related to the room temperature, the solution is to let the scanner power on for half an hour and then turn off the scanner, and then turn it on again a minute later, the problem can be solved. If the scanner still does not work at this time, turn off the scanner, disconnect the scanner from the computer, set the value of the SCSI ID to 7, and then turn the scanner on after about a minute. In winter when the temperature is low, it is best to warm up the scanner for a few minutes before using it, so that you can avoid the phenomenon of the Ready light not coming on after powering on the scanner.
Scanning out of the picture color blur
First of all, through the observation method to see if the flat glass on the scanner is dirty, if so, please wipe the glass with a clean cloth or paper, pay attention to do not use alcohol and other liquids to wipe, that will make the scanned images show rainbow color. If it is not a glass problem, please check the scanner to use the resolution is how much, such as 300dpi scanner scanning 1200dpi above the image will be more blurred. This is because a 300dpi scanner scanning 1200dpi is equivalent to zooming in on a point up to four times its size. Also, please check if the monitor setting is 16bit color or above. If you are scanning some printed materials, there is a certain reticle caused by the blur is understandable, the processing method can be used with the scanner itself comes with the software, you can also use Photoshop and other image software to deal with.
Output image color is not bright enough
This is also a software failure, you can first adjust the monitor brightness, contrast and Gamma value. Gamma value is the human eye from the darker to the light tone of a feeling curve. the higher the value of Gamma, the feeling of the color of the layers of the richer. We can adjust the Gamma value. Of course, in order to get better results, you can also be in Photoshop and other software to adjust the Gamma value, but this belongs to the "after-the-fact adjustments", we can according to the scanning of good photos of the specific circumstances of the Gamma value adjustment. In the software that comes with the scanner, if it is for general use, the Gamma value is usually set to 1.4; if it is used for printing, it is set to 1.8; photos on the web page is set to 2.2. There is also a scanner should be color-corrected before use, otherwise it is very likely that the scanned image will be distorted; in addition to the brightness/contrast options in the scanner driver dialog box to make specific adjustments.
Scanner problems usually come from the scanning effect, which is often one of the software failure, different scanners have different solutions for these software failures, you can use the relevant software to correct. Hardware failures are mainly interface and line problems, as long as you connect the line, set up a good port, and use the latest driver, these problems should be easy to solve.