The daily cash register of the supermarket is relatively large, so it is very necessary to maintain and maintain the POS cash register every day, but sometimes it will cause the supermarket cash register products to work normally due to various factors, such as common The guest display and main display failure, the details are as follows:

The supermarket cash register customer display cannot be displayed:

Judgment rule: First of all, we should not rush to disassemble the cash register, and display the cause of the fault. If the customer's display suddenly fails to display, it can be determined that the customer's display is faulty.

The cause of the failure: customer display aging, program changes, host interface damage, COM3 port damage.

Inspection method: Connect the customer display screen of the supermarket cash register to the host that can be displayed normally. Check whether it can be displayed normally. If it can display normally, replace the host interface and COM3 port one by one. If there is no fault in hardware replacement, check the program.

The main display of the supermarket cash register product does not light up:

Judgment rule: Usually, when the power is turned on in the supermarket cash register, the host is powered on, but the display shows no signal output (the display is red), no matter whether the host sends an abnormal alarm. The sound determines that the machine is not lit.

Cause of failure: The main possibility of this fault is that the plug-in is not plugged in or the main board is short-circuited or the main components are damaged, causing the main circuit to be short-circuited.

Inspection method: firstly pull out the pluggable device in the main body of the supermarket cash register and re-tighten it. If there is no effect, then the main components in the mainframe can be unplugged and connected while keeping only the chip, memory and power connection. If there is still no light at this time, it can be judged that it is irrelevant whether it is plugged in. It can replace the memory of the normal cash register and the chip to make a power connection attempt. At this time, it still does not light, and the chip and the memory can work normally on other machines. It can be determined that the motherboard is damaged and needs to be replaced by the supplier. If it can be lit under the minimum equipment condition, you need to plug each component into the main board one by one to confirm whether each device is damaged. If the device is not lit when it is plugged in, it can be determined that the device is damaged.

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