The reasons why the thermal printer prints unclearly
First, Paper was stored for an extended period of time or stored in an environment where the temperature is too high, and the heat-sensitive coating on the paper can be unclear or invalid.
Second, the thermal print head has dirt, can be wiped with a soft cloth, or thermal head need be replaced.
Third, sometime,Pos receipt printer does not print clearly because the printing speed is too fast. The printer's heating resistor does not have enough heat and time to allow the paper to react. Find the source and solve it!