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故障现象:接通电源无任何显示,一切操作失灵。分析检修:此种现象说明电源无任何输出。首先断开整机电源部分的接插件PG_1,通电后测量各电源输出端均无电压。测量C_3两端电压为300V左右,说明电源处在保护状态,怀疑变压器T_1次级端有短路故障存在,断电后,测量电源各输出端对地电阻值,发现PG_1的(11)脚(A14V)电阻接近为0。对有关元件如D_9、C_(12)、C_(13)及C_(38)逐一测量,结果检查出稳压管D_9
Symptoms: no power display, all the operation failure. Analysis and Maintenance: This phenomenon shows that the power supply without any output. First disconnect the power part of the connector PG_1, after power measurement of the power supply voltage is no voltage. The voltage across C_3 is about 300V, indicating that the power supply is in the protection state. It is suspected that there is a short circuit fault on the secondary side of transformer T_1. After the power is cut off, the resistance value of each output terminal of the power supply is measured and it is found that (11) The resistance is close to zero. On the relevant components such as D_9, C_ (12), C_ (13) and C_ (38) one by one measurement, the results check regulator D_9