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LQ—1600K打印机是最常用的针式打印机之一,本文介绍两例该打印机故障的维修方法,供大家参考。 故障现象之一:打印机打印几行后,字车只做往返运动而不打印。 分析与维修:LQ—1600K打印机的打印头有负温度特性的温度传感器。当CPU7810的AN_0脚电压大于1.01V时,打印机以正常速度打印。当AN_0脚在0.82V～1.01之间时,打印机以半速打印。当打印头温度超过100℃时,CPU的AN_0脚电压小于0.82V,打印机自动停止。字车只做往返运动,使打印头散热,此时面板指示灯闪烁。首先怀疑打印头温度太高,但用手摸打印头觉得温度并不高。断开热敏电阻的接线CN15的2、3脚后,故障仍然存在,说明热敏电阻是正常的。仔细分析电路,发现CPU的34脚AN_0脚和33脚AN_(ss)脚之间并联电容C30,参考电压通过R80和热敏电阻分压后由R81送到CPU的AN_0脚。开机测量AN_0脚的电压,发现此电压正常打印时为1.02V,但打印几行后,字车只
LQ-1600K printer is one of the most commonly used stylus printer, this article describes two cases of the printer repair methods for your reference. One of the symptoms of failure: After the printer prints a few lines, the word car only does back and forth without printing. Analysis and Maintenance: LQ-1600K printer’s print head temperature sensor negative temperature characteristics. When CPU7810 AN_0 foot voltage is greater than 1.01V, the printer prints at normal speed. When AN_0 feet between 0.82V ~ 1.01, the printer to print at half speed. When the print head temperature exceeds 100 ℃, CPU AN_0 foot voltage is less than 0.82V, the printer automatically stops. The word car only makes the reciprocating motion, so that the print head radiates, and the panel indicator blinks at this moment. First suspect that the print head temperature is too high, but touch the print head feel the temperature is not high. Disconnect the thermistor wiring CN15 2, 3 feet, the fault persists, indicating that the thermistor is normal. Careful analysis of the circuit and found that CPU 34 feet AN_0 feet and 33 feet AN_ (ss) feet parallel capacitor C30, the reference voltage through the R80 and the thermistor voltage divider by the R81 sent to the CPU AN_0 feet. Boot measured AN_0 foot voltage and found that this voltage is 1.02V normal print, but after printing a few lines, the word car