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美的电磁炉IGBT管热敏电阻安装在哪里?谁能说说看?_其他_设计456问答
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美的电磁炉IGBT管热敏电阻安装在哪里?谁能说说看?

浏览:59次 | 提问时间: 07-22 05:32
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3个答案
谈何容颜 07-22 05:33

功率管损坏通常由几个方面引发!1谐振电容容量不足!2滤波电容容量不足!3IGBT前级驱动对管软故障!4339输出的检窝脉冲异常!518V供电偏低或偏高!6IGBT热敏电阻失灵IGBT温度高不停机引发损坏!所有电磁炉都基本一样!

药别停 07-22 05:41

故障现象:美的mc-psy20d电磁炉数码管显示e
4、e
5、e6故障代码故障电磁炉维修分析:出现该故障是表示igbt温度检测电路中的热敏电阻出现问题(断、短路或阻值变化),因此我们可将故障范围定位在igbt温度检测电路及主控ic上。把igbt热敏电阻从板上焊下来,用万用表测量其电阻阻值,常温下热敏电阻的阻值是100k欧.由于热敏电阻采用的是负温度系数材料,其阻值会随着温度的上升而下降.在测量中假如测量值为0欧或者阻值无穷大,就表示热敏电阻已经短路或者断路,把热敏电阻拆下来,换上新的同型号的热敏电阻.上电试机一切正常,故障排除.假如热敏电阻本身是好的,我们就可以把故障锁定在后级电路上,就应该上电对电路进行分析了。用万用表测量热敏电阻的一端是否有5v,主控ic第24脚是否有0.58v的电压,假如电压正常,我们可以把故障锁定在主控ic上。假如电压不正常,我们用万用表电阻档测量r
9、r
23、c6,测量cn3到主控ic的24脚是否通路,把有问题的元器件拆下,换上同型号的元器件。假如元器件正常,我们都可以把故障锁定在ic上把ic从板上拆下来,换上同型号,同规格的ic,上电试机,一切正常,故障排除

谁擱淺le愛 07-22 05:49

E
3:陶瓷板高温(主传感器坏):IGBT过热保护。检查IGBT检温热敏电阻是否开路,风扇电路或者18V供电电路是否正常。美的电磁炉容易出现贴片电容器漏电、击穿、受损,可引发各种代码故障。采用电压测试法判断。

保障