Whether to choose a valid print content; Whether the distance between the print head and the bearing block or rubber roller meets the requirements; The print head may fail; Whether the synchronizer connection is normal;

Whether the ribbon has wrinkles; Whether the printing head is dirty (wipe with DK wipe cloth); Whether the bearing pad or rubber roller is dirty or damaged; Whether the ribbon and the print concentration setting match; Whether the ribbon is installed between the print head and the stripping roller; Check whether the machine is shaking and not fastening; Check whether the gap between the print head and the bearing pad is appropriate;