Epson TM-H6000V Technical Reference Guide - Page 141

Appendix  The initial setting is 100% print density.  If setting the speed to 350 mm/sec, use a customized value to set the print density to the recommended set- ting.  When the print density setting is too dark, the print speed tends to drop. If the print density is 115% or higher, and the room temperature is 15°C {59°F} or lower, the speed will be 200 mm/sec or slower.  When the print density setting is too dark, paper dust sticks to the print head surface, often resulting in faded print. Notes on preprinting  Preprinted thermal paper may cause faulty printing and decreased print density due to the thermal head sticking to the recording surface. Therefore, it is preferable to avoid using preprinted thermal paper.  If using preprinted thermal paper, make sure in advance that the conditions recommended by the original paper manufacturing company (type of ink, print conditions, etc.) are met, and that there is no faulty printing or decreased print density in the actual usage environment. Printable Area Slip (front) printing Top margin 85.4 5.6 57.15 5 39.7 18.4 When a model with E/P performs back feeding after front printing completed. When a model without E/P performs back feeding after front printing completed. When the printer ejects paper after front printing completed. [units: mm (All the numeric values are typical.)] 141