POS machine prompts card reading error or invalid card the reason: 1) Weak magnetic card, magnetic card itself 2) Make sure that there is no strong magnetic field interference around the machine when swiping the card. If so, please remove the relevant strong interference. 3) For some machine tools, when the credit card is used for good or bad, such equipment usually takes a long time, the head is too dirty, and a special head cleaning card can be used to clean the magnetic head, and the problem can be solved. Correctly swiping the card: Make sure that the magnetic card slides smoothly along the card slot and evenly slides when it is swiped. It cannot be too fast or too slow. The swipe speed range is between 20 mm/s and 60 mm/s. In general, the weak magnetic card is in the state of quick brushing. Card reading is better. Weak magnetic card, magnetic card itself The cardholder enters the password and displays "Personal password is wrong" the reason: 1. The password and card number do not match 2. The card information is not read correctly Approach: 1. Please re-enter the correct password 2. It may be that the magnetic stripe information of the customer's card is not very good. If there is a condition, try changing the card. Successful transaction but not successful Solution: 1. The split printer checks the printer power and connection is normal; 2. Reload the paper correctly and reprint the purchase order using the "Reprint" function. POS machine transaction or check-in prompt "A0 key verification error" Solution: 1. Please sign in again many times. 2. A0 is returned when signing in. Please record that the key has been lost. Pos machine shows "printer jam" cause of issue: 1) The paper is not installed 2) printer core failure 3) There are stolen goods in the printer 4) The printer spindle is dirty 5) There is a problem with the pos motherboard 6) The head of the print head shrinks back and forth Recommended treatment method: 1) Reload the paper (small hole to the left, large hole to the right, reverse side insert) 2) Replace the printer core 3) Cleaning machine models 4) Add lubricating oil to the printer spindle 5) The main board needs to be repaired 6) Add oil to the print head POS cash register host failed The following is a brief introduction of the phenomenon of failures and causes of the frequent occurrence of the POS cash register host. Fault phenomenon: 1, after power, no display. Failure analysis: from the motherboard's boot sequence analysis, when the power supply is working properly, it will send a “POWER GOOD†signal to the CPU. When the CPU receives this signal, it only starts the POST action. The main task of POST is to detect some Whether the key equipment exists and can work normally, such as memory and graphics cards, if there is an error in this process, there will be no display failure. Components involved: power supply, motherboard, CPU, memory, graphics card. 1) Minimize the system hardware, only keep the motherboard and power supply, through the jumper Clear Cmos, power, if the motherboard speaker can send a memory-free alarm sound, clean the memory finger with a rubber mallet, then plug in and test; Display, solve the problem, if no display, replace the memory and test again. 2) According to the previous step, after the power is turned on, there is no alarm sound on the main board speaker, replace the power supply with the replacement method, and the main board detects the faulty part. Symptoms: 2. After power on, wait for a while to display. Fault Analysis: After power on, the boot time is longer than normal time. It is very likely that the capacitance on the mainboard or the capacitance in the power supply causes a leakage, which causes the charging time to become a longer boot time. Involved Parts: Motherboard, Power Supply 1) Use an observation method to observe the capacitance on the mainboard. If the capacitance has swelling or leakage, replace the capacitor or motherboard. 2) Use a replacement method to replace the power supply and main board for testing. } Fault phenomenon 3, the use of the process often no reason automatic restart failure analysis: due to capacitance change, system instability, viruses may cause automatic restart for no reason. Components involved: power supply, motherboard, system 1) First of all, check the power supply and main board capacitance for swelling and leakage. If there is such a situation, replace the capacitor or corresponding parts before testing. 2) Use a replacement method, replace the power supply, and test the motherboard. 3) After reinstalling the operating system, test without loading any drivers or software. Then gradually install drivers and application software tests.