A: Observe whether there is a significant difference in the carbon belt coating;

Clean the printhead and rubber roller roller with an alcohol cotton;

Adjust the left and right pressure of the printer, Note: The industrial machine has a special device to adjust the pressure, and some of the desktop machines have some not;The printer pressure is uneven, increasing the pressure on the side of the print blur;

Check whether the rubber roller shaft is worn, if the wear is serious, only replace the rubber roller shaft;

Use inferior carbon tape and replace the ribbon