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故障现象1 LQ1600K打印机打开电源开关,指示灯不亮。故障的分析与排除检查联线一切正常,故障可能出在电源部份。打开LQ1600K打印机机壳,拆下电源部分,看到由C4、C5、C6、C14、L1、L2组成电网滤波器,隔离电网与打印机干扰,经整流后变压成低电压供打印机。其它打印机电源部分是先变成低电压后再整流,所以不要选耐压低电流小桥堆。现用5A/1000V的整流桥堆代换,通电用万用表量桥堆输出,直流电压为300V,正常。装好打印机,打开打印机电源开关,打印机恢复正常。
Symptom 1 LQ1600K printer power switch is turned on, the indicator does not light. Failure analysis and troubleshooting Check all the normal line, the failure may be in the power part. Open LQ1600K printer chassis, remove the power section, saw by the C4, C5, C6, C14, L1, L2 form the power grid filter to isolate the interference with the power grid and the printer, after rectification transformed into low voltage for the printer. Other printer power supply part is to turn into a low voltage and then rectify, so do not choose low voltage small current bridge reactor. Now 5A / 1000V rectifier bridge reactor replacement, power meter with a multimeter bridge reactor output, DC voltage of 300V, normal. Install the printer, turn the printer power switch, the printer back to normal.