推荐回答（2个）
有两个原因，1.打印头断针。2.驱动程序安装的是代用的驱动，并非打印机本型号的驱动。
如果以前能打印，现在不能打印了，应该是针头的问题，如果是以前没打印过的单据，则可能是纸张设置的问题。
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