(As a high-reliability product, the cash register has a low probability of generating defects. However, due to changes in the external power supply or external environment, it constitutes a product defect, and it may also be caused by serious bumps in the transfer, which constitutes a hardware defect, but the hardware itself is still relatively rare. Therefore, when the cash register system generates defects, it should be determined and cleaned based on the principle of "soft first, then hard, first outside and then inside")
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