打印模糊有以下几种原因导致：
a.打印头有脏污--打印机关机情况下，用酒精棉清理干净打印头，晾干了再打印。下图红线标注的黑色条是打印头。
b.浓度低--需要调试浓度，增加打印浓度即可（驱动安装教程里有图示）
c.纸张质量问题，热敏涂层较差的纸张打印不清楚，可以换纸试试。
d.排除以上问题，一般是打印头问题，需要寄回更换检修
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