[Fault phenomenon]: A touch screen does not work, and there is no response when touching any part.
[Fault Analysis Processing]: First check whether the wiring interfaces are loose, and then check if there is any conflict between the serial port and the interrupt number. If there is a conflict, adjust the resources to avoid conflicts. Then check the surface of the touch screen for cracks. If there is any crack, it should be replaced in time. Also check the surface of the touch screen for dirt and, if so, clean it with a soft cloth. Observe that the indicator light on the control box is working properly. When it is normal, the indicator light is green and blinks.
If the above parts are normal, you can use the replacement method to check the touch screen, replace the control box first, then replace the touch screen, and finally replace the host.
1) It may be the connection of the touch screen. One of the connections to the keyboard port of the host computer (the 5 volt touch screen operating voltage from the keyboard port) is not connected. 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 reinstall it.
3) It may be that the host is a domestically produced original machine. The installed operating system is an OEM version, which has been adjusted by the manufacturer, resulting in non-standard serial communication. It is not compatible with the touch screen driver. If possible, format the hard disk and drive the touch screen after installing the system. .
4) It is possible that the touch screen driver version is too low. Please install the latest driver.
5) Is there any equipment in the host that conflicts with the serial port resources? Check each hardware device and adjust it. For example, after some network cards are installed, the default IRQ is 3, which conflicts with the IRQ of COM2. In this case, the IRQ of the network card should be changed to the unused IRQ. .
If it is a resistive touch screen, it can be repaired as follows:
1) Check if the connection of the touch screen is connected. One of the connections to the keyboard port of the host (take the 5 volt touch screen working voltage from the keyboard port) is not connected. Please check the connection.
2) Observe the condition of the touch screen control box light. If it is not lit or the red light is on, the control box is broken and please replace it.
3) If the confirmation is not the above, please delete the touch screen driver and restart the computer to reinstall the driver, or replace the driver with a newer version.
4) Is there any equipment in the host that conflicts with the serial port resources? Check each hardware device and adjust it. For example, after some network cards are installed, the default IRQ is 3, which conflicts with the IRQ of COM2. In this case, the IRQ of the network card should be changed to the unused IRQ. It may be that the computer motherboard and the touch screen control box are not compatible. Please replace the main unit or the motherboard.
5) If the touch screen has been used for a long period of time (3-4 years) and 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 if the connection of the touch screen is connected. If it is an external box control card, the control box part is connected directly to the cable extending from the touch screen through the return slot. The power supply part passes through a keyboard conversion head (must be The small rubber head next to the RS232 port connector can be pulled out before the power can be connected. Connect one end to the keyboard port of the main unit and the other end to the computer keyboard. Insert a small head of the 5V power supply into the 232. The connection of the port will connect the RS232 connector of the control box to the 9-pin hole of the host. If your host can use the 25-pin hole, please purchase the 9-25 adapter for conversion. If your host's keyboard The mouth is the keyboard port of the original machine, please buy a pair of large keyboard to the adapter of the keypad.
2) If it is a built-in card type, check whether the jumper jumps to the jumper of the control card. Since the user's machine configuration is different, the peripherals used at the same time are different. Therefore, in order to avoid the conflict between the touch screen and the user's peripherals, Micro Touch provides the jumper description of the control card for the customer to choose. The control card address jumper setting indicates the COM port setting.
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 the COM port and the interrupt jumper should be set as follows. Special cases are exceptional.
COM1->IRQ4 | COM2->IRQ3 | COM3->IRQ4 | COM4->IRQ3
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