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dan pian shi shou yin ji diao pin wu yin gu zhang de xiu fu
Pages: 28
Year: Issue:  9
Journal: Family Electronics

Keyword:  波段开关 单片集成电路 调频 收音机 电压异常 故障现象 分析检修 点接触 清洁剂 集成块;
Abstract: <正> 故障现象:一台从乐牌 AM/FM 收音机,该机采用 ULN2204A单片集成电路,使用一段时间后,出现调幅波段(AM)接收正常,而调频波段(FM)无音。分析检修:首先用电器清洁剂清洗波段开关,使其触点接触良好。然后测集成块 ULN2204A 各引脚电压,其中第①~(15)脚电压均正常,而第(16)脚电压明显异常,即把波段开关拨至调幅波
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