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CR3240高速彩色汉字打印机,因速度快、功能全、使用方便、性能价格比高,已迅速占领市场,因此对这种打印机的维修工作也很快增多。本文将结合工作原理剖析一些典型故障的产生原因及其排除方法。故障现象1 打印机开机后,打印头在原地剧烈抖动,不能复位。分析与排除关机后用手拨动打印头字车,发觉阻尼很大。但如拔下字车电机驱动电路的插座CN9,则阻尼明显减小,因此估计是驱动电路损坏。根据电路图,检查发现R118阻流电阻已烧断;专用步进电机驱动芯片IC12的I1脚与12脚间断路,断定IC12驱动芯片的一路(B相)已经烧坏。更换IC12与R118后,打印机恢复正常。这类故障往往是由于字车负载的突然增大造成的,如打印头左右移动时卡纸、打印针钩色带等,所以,在使
CR3240 high-speed color Chinese character printer, because of speed, full-featured, easy to use, high performance and low cost, has quickly occupied the market, so the maintenance of this printer also increased rapidly. This article will combine the working principle to analyze the causes of some typical failures and their removal methods. Symptom 1 After the printer is powered on, the print head jerks violently in place and can not be reset. Analysis and removal of hand-cranked print head car after turning off, I found a great damping. However, if you unplug the car motor drive circuit outlet CN9, the damping significantly reduced, it is estimated that the drive circuit is damaged. According to the circuit diagram, check and found that the R118 choke resistance has been blown; special stepper motor driver chip IC12 I1 pin and 12 pin open circuit, concluded that IC12 driver chip all the way (B phase) has been burned. After replacing IC12 and R118, the printer back to normal. Such failures are often caused by a sudden increase in carriage load, such as the print head moves left and right jam, print hook and ribbon, etc. Therefore,