#control card

Do not connect the control card to the unit board. To try to direct to the switching power supply, the unit board in the process of working voltage is extremely unstable. Will cause the control card fast and slow, serious can not communicate or program run need to repair, especially the U disk control card, in the case of unstable voltage may not be able to read disk or read disk error. Do you know LED display synchronous control and asynchronous control?

2, indoor, 16 sweep unit board should not be connected to the whole screen debugging, many indoor monochrome or two-color, or even full color, no debugging state directly connected to the control card on the power, it is possible to burn a large area of the unit board behind the row sweep drive 4953 chip. Please only connect one unit board for debugging. After debugging, unplug the power supply and connect the control card.

3, control card please keep working in a dry, relatively stable environment, too high temperature, humidity, and dust environment, is very unfavorable to the control card.

4, in the case of no power off, do not plug and remove the serial port, so as to avoid damage to the computer serial port and control card serial port due to improper operation.

It is strictly prohibited to adjust the input voltage of the control card when the system is live, so as not to damage the serial port of the computer and the serial port of the control card due to improper adjustment and high voltage. The normal operating voltage of the control card is 5V. When the power supply voltage is adjusted, the control card should be removed and the multimeter is used to measure the slow adjustment.

It is strictly prohibited to short-connect the grounding terminal of the control card with the display frame. Otherwise, once static electricity accumulates on the display frame, it is easy to damage the serial port of the computer and the serial port of the control card and the serial port of the control card and the display unit on the screen body, resulting in unstable communication. Therefore, it is recommended that you use a serial port isolator when the outdoor screen or the communication distance is far, to avoid damage to the serial port of the computer and control card due to the ground circuit, surge, lightning induction, hot swap and other adverse environment.

7, must ensure that the control card and the computer serial port is correctly connected, so as not to damage the control card serial port and the computer serial port due to incorrect input signal.