收音机开机后,收不到电台,但有轻微沙沙声,在有交流电的地方,有时在收音机低频端能听到工业电干扰声,这种故障可能是收音机本机停振造成的。为了判断是否属于本机停振,一般的方法是将收音机后盖打开,取出机芯,接通电源,测量变频级晶体管发射极对地电压,把双连本振连定片到地短路一下,看电压是否略有下降,这种方法手续比较多,也费时 Radio does not receive radio after boot, but there is a slight rustle. In places where there is AC power, industrial electric noise may be heard on the low frequency end of the radio sometimes, which may be caused by the stop of the radio. In order to determine whether it belongs to the machine to stop vibration, the general method is to open the back cover of the radio, remove the movement, turn on the power, measure the emitter of the inverter level transistor voltage to ground, See voltage is slightly decreased, this method more formalities, but also time-consuming