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有一台凯歌牌汽车收音机,电源电压为12伏,接收任何电台均无声.从现象上看去,故障好象发生在低放部分或变频部分.但在测试整机电流时,即将万用表置于电流档(mA)串接在电源电路中,却发现整机静态电流高达约100mA,整机电流过大说明本机有短路故障.为减少整机电流的消耗,于是又将刻度盘前两只指示电源灯泡拆卸下来,再测试整机电流约25mA,即整机电流正常,说明故障点发生在指示
There is a Kay card car radio, the power supply voltage of 12 volts, receiving any radio stations are silent from the phenomenon of view, the fault seems to occur in the low-lying part or frequency conversion part.But in the test machine current, the multimeter will be placed in the current (MA) connected in series in the power circuit, but found that the machine quiescent current up to about 100mA, the whole current is too large to indicate the machine has a short circuit fault.In order to reduce the current consumption of the machine, so the first two dial indicator Power bulb removed, and then test the whole current of about 25mA, the current machine is normal, indicating the point of failure occurred in the instructions