故障一：开启打印机电源，指示灯不亮、不通电。故障分析与检修：不通电，说明电源电路有问题。开启打印机电源开关，万用表测地头两端的电阻为无穷大，说明电源变压器初级开路，千万无电压输出。这种情况，多数是电源变压器的初级的热保险损坏。拆开打印机外壳，取出电源变压 Fault one: turn on the printer power, the indicator is not lit, no power. Failure Analysis and Maintenance: no power, indicating a problem with the power circuit. Turn on the printer power switch, multimeter measuring resistance at both ends of the head infinite, indicating the primary power transformer open circuit, tens of millions of voltage output. In this case, most of the power transformer is the primary thermal damage. Open the printer case, remove the power transformer