The price tag on the shelf. Why does the printer not recognize the black label behind the label?
The following reasons can not identify possible, first suspected paper identification problems, such as black label damage can lead to failure or lack of recognition of black label blackness lead to the identification of failure.
Second, it is suspected that the identification window was covered or soiled by foreign objects, resulting in a failure to read the black label properly. Of course, hardware problems are not ruled out, such as damage to optical sensors or circuit problems. It is suggested to take the rule of exclusion and try to remove the problem step by step from the simple beginning. For example, use different volumes of paper to test, or use other printers to determine if there is a problem with paper.
