The touch screen is a device that integrates display and touch control. Because the touch system is a bridge for man-machine dialogue, it has a wide range of contacts with people, and it is composed of glass as the main body, which is relatively fragile, and the failure and breakage rate is relatively high compared to other devices. Therefore, the touch screen maintenance has been formed. An industry.
1. The touch screen is not allowed
1. Failure phenomenon
A surface acoustic wave touch screen cannot perform the corresponding operation normally when touching the part of the display screen with a finger.
2. Failure analysis and processing
This phenomenon may be caused by the sonic touch screen being used for a period of time, and the reflective stripes around the screen are covered by dust. You can wipe it with a dry soft cloth, then power off, restart the computer, and recalibrate. It is also possible that the reflection stripes of the sonic screen have been slightly damaged. If this happens, it cannot be completely repaired.
If it is a capacitive touch screen, the screen calibration program can be run under the following conditions:
(Start--Program--Microtouch Touchware)
1) Complete the driver software installation for the first time.
2) After changing the resolution or display mode of the monitor each time.
3) After changing the displayed display area each time.
4) After adjusting the frequency of the controller each time.
5) Every time the cursor cannot correspond to the touch point.
After calibration, the calibrated data is stored in the register of the controller, so there is no need to calibrate the screen every time the system is started.
2. The touch screen does not respond
1. Failure phenomenon
A touch screen does not work, and there is no response when touching any part.
2. Failure analysis and processing
First check whether each wiring interface is loose, and then check whether there is a conflict between the serial port and the interrupt number. If there is a conflict, adjust the resources to avoid the conflict. Then check whether there are cracks on the surface of the touch screen. If there are cracks, replace them in time. It is also necessary to check whether there is dirt on the surface of the touch screen. If there is, use a soft cloth to remove it. Observe and check whether the indicator light on the control box is working properly. When it is normal, the indicator light is green and blinking.
If the above parts are all normal, you can check the touch screen with the replacement method, first replace the control box, then replace the touch screen, and finally replace the host.
If it is a surface acoustic wave touch screen, the following maintenance can be carried out:
1) It may be that one of the wires of the touch screen is not connected to the keyboard port of the host computer (take the 5V touch screen operating voltage from the keyboard port), please check the connection.
2) It may be that the serial port number selected during the driver installation process of the touch screen does not correspond to the serial port number actually connected to the touch screen. Please uninstall the driver and install it again.
3) It may be that the host is a domestic original machine, and the installed operating system is an OEM version, which has been adjusted by the manufacturer, resulting in non-standard serial communication and incompatible with the touch screen driver. If feasible, please format the hard disk and drive the touch screen after installing the system .
4) It is possible that the version of the touch screen driver is too low, please install the latest driver.
5) Whether there is a conflict between the device and the serial port resource in the host. Check the hardware devices and adjust them. For example, the default IRQ of some network cards after installation is 3, which conflicts with the IRQ of COM2. At this time, the IRQ of the network card should be changed to an idle unused IRQ .
If it is a resistive touch screen, it can be repaired as follows:
1) Check whether the wires of the touch screen are connected correctly. One of the wires connected to the keyboard port of the host (take the 5V touch screen working voltage from the keyboard port) is connected. Please check the connection.
2) Observe the status of the touch screen control box light, if it does not light up or the red light is on, it means that the control box is broken, please replace it.
3) If the above conditions are not confirmed, please delete the touch screen driver and restart the computer to reinstall the driver, or replace with a newer version of the driver.
4) Whether there is a conflict between the device and the serial port resource in the host. Check the hardware devices and adjust them. For example, the default IRQ of some network cards after installation is 3, which conflicts with the IRQ of COM2. At this time, the IRQ of the network card should be changed to the free and unused IRQ. . It may be that the computer motherboard and the touch screen control box are not compatible, please replace the host or motherboard.
5) If the touch screen has been used for a long period of time (3-4 years) and it is found that some areas of the touch screen cannot be touched, it may be that the touch screen is broken. Please replace the touch screen.
If it is a capacitive touch screen, it can be repaired as follows:
1) Check whether the wiring of the touch screen is connected. If it is an external box control card, the control box part is directly connected to the cable extending out of the touch screen through the recirculation groove. The power supply part is connected through a keyboard converter (must be Unplug the small rubber head next to the RS232 port connector before you can wire in the power supply), connect one end to the keyboard port of the host, and the other end to the computer keyboard. Insert a small end of the 5V power supply that you got into the 232 Connect the RS232 connector of the control box into the 9-pin hole of the host. If your host can use 25-pin holes, please purchase 9-25 adapters for conversion. If the keyboard port of your host is the small keyboard port of the original machine, please purchase a pair of large keyboard to small keyboard adapters.
2) If it is a built-in card type, check whether the jumper is jumped to the jumper of the control card. Because the configuration of the user's machine is different, the peripherals used at the same time are also different. Therefore, in order to avoid the conflict between the touch screen and the user peripherals, Micro Touch provides the jumper instructions of the control card for customers to choose. Control card address jumper setting instructions:
COM port settings
Comm Port I/O A1 A2 A3 A4 A5 A6
COM1 3F8-3FF ON OFF ON OFF ON OFF
COM2 2F8-2FF OFF ON ON OFF ON OFF
COM3 3E8-3EF ON OFF OFF ON ON OFF
COM4 2E8-2EF OFF ON OFF ON ON OFF
COM5 2E0-3E8 OFF ON OFF ON OFF ON
COM6 2F0-2F8 OFF ON ON OFF OFF ON
COM7 3E0-3E8 ON OFF OFF ON OFF ON
COM8 3F0-3F8 ON OFF ON OFF OFF ON
The combination of COM port and interrupt jumper should be set as follows, except for special cases.
COM1－>IRQ4 | COM2－>IRQ3 | COM3－>IRQ4 | COM4－>IRQ3
Three, the touch screen has a long response time
1. Failure phenomenon
A touch screen, after touching the monitor screen with a finger, it takes a long time to respond.
2. Failure analysis and processing
This may be caused by moving water droplets on the touch screen, just wipe it with a dry soft cloth. It is also possible that the host grade is too low, such as the clock frequency is too low, if this is the case, it is best to replace the host.
Fourth, the touch screen does not respond locally
1. Failure phenomenon
A touch screen, after touching the monitor screen with a finger, there is no response in some places.
2. Failure analysis and processing
It is possible that the reflective stripes of the touch screen are partially covered, and can be wiped clean with a dry soft cloth. It is also possible that the reflective stripes of the touch screen are partially scraped off by hard objects and cannot be repaired.
Five, the touch screen is normal but the computer cannot be operated
1. Failure phenomenon
A touch screen, everything is normal after testing itself, but after connecting to the host, the computer cannot be operated.
2. Failure analysis and processing
This may be because the touch screen control card receives the operation signal before the host starts to load the touch screen driver. You only need to restart the computer after the power is turned off. It is also possible that the version of the touch screen driver is too low, and the latest driver needs to be installed.
Sixth, the touch screen does not respond for the first time after installing the driver
1. Failure phenomenon
A touch screen, the first time you start the touch screen after installing the driver, there is no response.
2. Failure analysis and processing
First confirm whether the touch screen wiring is connected correctly, if not, connect all the wiring correctly after shutting down. Then check if there is any conflict between the device and the serial port resource in the host, check the hardware devices and adjust them. For example, the default IRQ of some network cards after installation is 3, which conflicts with the IRQ of COM2. At this time, the IRQ of the network card should be changed to idle and unused. IRQ.
7. No response to touch after using for a period of time
1. Failure phenomenon
A touch screen has no response after it is turned on and used normally for a period of time.
2. Failure analysis and processing
1) Check whether the hard disk shutdown is set in the "Monitor Energy Saving Settings" of Wlndows 9x. The method is to click the right mouse button on the desktop, select the "Properties" command, and then select the "Screen Saver" tab from the dialog box, click the "Settings" button, and set the parameters except for "Power Plan" to "Always On" In addition, the rest are "never".
2) In some applications, due to poor grounding performance, a large amount of static electricity will be applied to the enclosure of the control box, which will affect the working electric field inside the control box and cause the touch to gradually fail. At this time, use a wire to ground the control box shell and restart it.
3) Because the surface of the surface acoustic wave touch screen is full of sound waves when it is working, if the touch screen is not wiped for a long time, excessive dust will accumulate and the reflection stripes of the wave will be blocked, which will cause the touch screen to fail to work properly. For touch monitors, use clean business cards or banknotes to gently wipe off the dust on the surrounding reflective stripes through the gap between the front cover of the monitor and the touch screen, and then restart the computer. For touch all-in-ones, you can open the front cover of the display, wipe off the dust on the surrounding reflective stripes with a clean towel, and then restart the computer.
4) Many touch all-in-one touch screen control boxes use the method of taking power from the all-in-one power supply instead of the main unit. Therefore, you should also check whether the 5V output of the all-in-one power supply is correct. Sometimes the instantaneous current is too large, causing the fuse to be burned. It is necessary to replace the fuse.
8. Decreased accuracy of touch screen clicks
1. Failure phenomenon
For a touch screen, its click accuracy is reduced, and the cursor is difficult to locate.
2. Failure analysis and processing
1) Run the touch screen calibration program. (Start-Settings-Control Panel-Sonic Screen-Caliberate button).
2) If it is a newly purchased touch screen, please try to delete the driver, and then power off the host for 5 seconds to reinstall the driver.
3) If the above method does not work, it may be that the reflection stripes of the sonic screen are slightly damaged during transportation and cannot be completely repaired. You can deviate from the calibration bullseye in the opposite direction (relative to the direction that deviates from the mouse) equidistantly for positioning.
4) If the sonic screen is inaccurate after a period of use, it may be the reflective stripes around the screen or the transducer is covered by dust. If you are using a KA type cabinet, you can open the upper cover and use a dry soft cloth Dip industrial alcohol or glass cleaning fluid to clean the surface, and then re-run the system, pay attention to the upper left, upper right, lower right transducer can not be damaged, then power off, restart the computer and recalibrate.
5) There are water droplets or other soft things sticking to the surface of the touch screen, and the touch screen misjudges that the surface acoustic wave screen is inaccurate due to hand touch, just remove it.
Nine, the mouse stays at a certain point on the touch screen
1. Failure phenomenon
A touch screen, the mouse can not move after power on, but stays at a certain point of the touch screen.
2. Failure analysis and processing
This happens because the touch area of the resistive screen (the surface of the resistive screen is divided into two parts: the touch area and the non-touch area. Clicking on the non-touch area does not respond) is pressed by the display shell or the cabinet shell, which is equivalent to a certain The point keeps being touched. If the cabinet shell is pressing the touch area, you can increase the distance between the cabinet and the monitor screen. If the display shell is pressing the touch area, you can try to loosen the screws of the monitor shell a bit.
10. The touch screen is unstable
1. Failure phenomenon
A touch screen, its work is extremely unstable, sometimes it can be clicked normally, sometimes it has no response.
2. Failure analysis and processing
In view of this phenomenon, you should focus on checking whether each wiring interface is loose, and whether there is a conflict between the serial port and the interrupt number.
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