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you yi xqb36 3 xing quan zi dong xi yi ji jian xiu
Author(s): 
Pages: 45
Year: Issue:  3
Journal: Family Electronics

Keyword:  保护电路全自动洗衣机电源电压微处理器饱和导通集电极电压工作原理电压信号现象分析停止运行;
Abstract: <正> 故障现象:刚开机运行时工作正常,但十几分钟后自行停止运行,指示灯熄灭。分析检修:根据故障现象分析,CPU损坏的可能性不大,很可能是线路板上某些元件引脚虚焊或随温度升高性能变劣,特别是过压保护电路和欠压保护电路。根据上述分析,首先检查过(欠)压保护电路,相关电路如附图附示。该机过压保护电路的工作原理如下:当电源电压≤245V时,K点对地(指线路板上的公共地,下同)电压≤7.95V,此时V36基极电压为0.65V;发射极电压为0.16V,故V36截止,V35则饱和导通,V35集电极电压为0.47V。微处理器第(37)脚接收到该电压信号后判断电源电压正常,正常执行工作程序。当电源电压≥250V时,K点电压≥8.2V,V39反向导通,从而V36饱和导通,V35截止,V35集电极输出电
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