The application of industrial computer in broadcast transmitter, with the gradual implementation of automation, the application of industrial computer (IPC for short) is more extensive. After the transformation of the automation equipment, the "overload protection and PSM control device" and "electrical control logic and indicating device" are controlled and monitored by the industrial computer. Through the corresponding program control, the machine can automatically switch on and off and automatically change the frequency. Upload the transmitter information to the computer room platform industrial computer through the 100M network port. During automatic operation, it can receive various commands from the room platform industrial computer computer, including downloading the operation diagram, frequency switching, etc., to realize the connection between the electronic control system and the monitoring network system. communication; realize the communication between the computer room platform and each industrial computer. The use of industrial computer greatly improves work efficiency.
Common fault handling COM port communication is not normal handling
Fault phenomenon: When communicating with other COM port equipment RS485, it can send but not receive, or can receive and cannot send.
Analysis and handling of faults: When programming the normal COM port communication, it is generally necessary to judge the communication status of the COM port, so that the data can be sent normally when the data enable signal is valid, and the data can be received normally when the receive data enable signal is valid. Speaking of the RTS communication method, the general user, in order to facilitate programming and improve the program execution speed, directly identify the communication status of the COM port in the design hardware, and no longer query the sending and receiving status during programming. This is the AUTO communication method. Considering the versatility, usually In this case, the COM ports on the motherboard are all RTS communication mode, so when you use it for RS-485 communication, due to the difference of the above communication modes, there will be a phenomenon that can send or not receive or can not receive or send. The simplest solution is to use the EVOC product ARK-14520 (RS232 to RS485 module), but if it is the communication between the COM ports on the motherboard, there is generally no such problem. Troubleshooting and Handling of Workstations with LCD and Membrane Keyboard Troubleshooting of LCD not illuminating: The LCD display does not respond after the chassis is powered on.
Troubleshooting and handling: After power-on, the LCD display has no response, indicating that the LCD backlight is not lit. Use a multimeter to measure the input power voltage of the backlight driver board inverter and find that +12V is not input. After cutting off the input power of the backlight driver board, the voltage is normal. It is suspected that the +12V power supply on the backlight driver board is short-circuited. Remove the backlight driver board from the chassis and then power on the problem to solve the problem, and found that the installation location has signs of short circuit and burnt black. After taking some protective measures, the problem of installing the backlight driver board is completely solved.
Troubleshooting symptoms that the LCD does not display: "white screen" or "blurred screen" after power-on.
Fault analysis and processing: According to the fault phenomenon, it is determined that the backlight has been lit normally, it should be because there is no data input or the LCD is not connected to the power supply. Checking the power supply is ok, using the oscilloscope to measure the LCD input data RGB and found no abnormality, but found that there is no signal from other input pins, which is determined to be the Shift clock signal. Use a multimeter to measure this connection is not connected, and the LCD display is normal after power-on.
Fault phenomenon: After power-on, the "white screen" changes to "black screen" or the "blooming screen" changes to "black screen".
Fault analysis and processing: This fault phenomenon means that the LCD backlight has been lit normally and there is a signal input, but the input signal is incorrect. Generally, it is caused by the wrong setting of the jumper on the motherboard or the display card to select the LCD type, or because some control leads are blocked. A little inspection will determine the fault (Note: Misconnected signals can also cause this type of fault, but generally this is not the case unless the LCD is wired incorrectly).
LCD Display Offset Handling
Symptoms: The display area is shifted up, down, left and right under DOS or Windows.
Analysis and handling of faults: Due to the many brands of the same type of LCD, some parameters will be slightly different, causing some LCDs of the same type but different brands to have display area shifts. Except for some LCDs with their own adjustment functions, others must be modified. BIOS to eliminate the fault.
Handling of workstation keyboards that cannot be used
Fault phenomenon: open the front panel door of the chassis and plug in the standard 104 keyboard, the membrane keyboard and the external standard 104 keyboard cannot be used after booting.
Troubleshooting and Handling: The problem is that a keyboard cable from the motherboard keyboard interface to the CPU KB port of the keyboard control board is not connected. There are two ways to connect the EVOC control chassis, one is to connect in the chassis, and the other is to connect the back panel of the chassis to the CPU KB port through the PS2 port of the motherboard, as long as the keyboard is connected, it will return to normal.
Precautions for the use of industrial computer
Environment: The use environment of the industrial computer should be protected from high temperature and humidity. Pay attention to indoor ventilation and cooling for places where the machine temperature is high. Prevent the CPU from working in a high temperature environment for a long time, which will affect the service life of the CPU. The northern area is windy and sandy, so pay attention to dust prevention. Clean the fan dust filter in time.
Anti-interference: Due to the influence of high frequency, anti-interference measures should be taken for the industrial computer, and the grounding should be good. To connect the data cable, choose a transmission cable with good shielding effect. In order to prevent the interference caused by the power supply in series, it is necessary to install a UPS regulated power supply for power supply. The use of industrial computer has greatly improved the degree of automation of the equipment. The above are the common faults and processing methods of industrial computer, as well as some matters to be paid attention to in maintenance.
