打印机装有打印机纸,开机后打印头复位,但面板ON LINE灯不亮,CHECK灯亮,按亮ON LINE联机打印一行后,ON LINE灯灭,CHECK灯亮,打印停止。 此现象系纸尽检测光电耦合器界面脏污造成的。 该机字辊下装有纸尽检测光电耦合器,其中的发光二级管与光敏三级管是装在同一侧的,工作时是利用打印机对纸的反射作用来决定光敏三板管的导通,装有打印纸时,光被反射,光敏三极管导通;不装打印纸时,光无法反射,光敏三极管不导通。在开机复位后,打印机要对打印纸的有无进行检测,有打印纸时面板上ON LINE灯亮,CHECK灯灭,打印机进入联 The printer is equipped with printer paper, reset the print head after power on, but the panel ON LINE light does not light, CHECK light, press ON LINE to print a line, ON LINE light off, CHECK light, print stop. This phenomenon is caused by the paper to check the dirty interface of the optocoupler. The machine word roll loaded with paper to do test optocoupler, which light-emitting diode and the photosensitive tube is installed on the same side, the work is the use of the printer’s reflection on the paper to determine the conduction of light-sensitive three-tube , Equipped with printing paper, the light is reflected, the phototransistor conduction; do not install the paper, the light can not be reflected, the phototransistor does not conduct. After power on reset, the printer to detect the presence or absence of the paper, paper with the ON LINE switch panel lights on, CHECK lights off, the printer into the joint