故障现象打印字迹模糊，伴有掉行现象。分析检修据用户反映，该打印机使用时间较长，使得打印针磨损严重，打印滚辊表面出现凹凸不平的痕迹。将打印头位置调至1档，装上厚纸，联机打印，故障依旧。根据故障现象，初步判断出此故障是由于打印头或打印滚辊故障所致。更换一只新的 Symptom Print blurry writing, accompanied by falling phenomenon. Analysis and maintenance According to the user reflects the printer to use a longer time, making the print needle wear serious print roller surface irregularities. The print head position adjusted to 1 file, loaded with thick paper, online printing, the fault still. According to the fault phenomenon, it is initially determined that the fault is caused by the failure of the print head or the printing roller. Change a new one