(1) First check the printer pressure, unilateral is too large, it is recommended to adjust to the appropriate size;
(2) Such as: factory is external carbon, or internal and external carbon belt can be used, this link to check whether there is no installation error consumables;
(3) whether the carbon slitter is bad (including whether the paper core is left and right dislocation);
(4) Change into thermal paper without carbon belt printing, observe whether the carbon belt shaft rotates, such as rotation indicates that the early installation is not in place, not rotating means that the machine is broken
(The internal spring of the carbon belt shaft and the aging voltage of the carbon belt sensor are small);
(5) the surface coating and the back coating of the carbon belt stick together, which is a product quality problem;