欧姆龙 CJ1W-IC101 模块特价
1、是否有断线； 
2、分力元件如电阻、电解电容、电感、二极管、三极管等时候存在断开现象； 
3、电路板上的印制板连接线是否存在断裂、粘连等； 
4、是否有人修过？动过哪些元器件？是否存在虚焊、漏焊、插反等操作方面的失误； 
在确定了被修无上述状况后，首先用万用表测量电路板电源和地之间的阻值，通常电路板的阻值都在70-80？以上，若阻值太小，才几个或十几个欧姆，说明电路板上有元器件被击穿或部分击穿，就必须采取措施将被击穿的元器件找出来。具体办法是给被修板供电，用手去摸电路板上各器件的 
温度，烫手的讲师重点怀疑对象。若阻值正常，用万用表测量板上的阻、二极管、三极管、场效应管、拨段开关等分力元件，其目的就是首先要确保测量过的元件是正常的，我们的理由是，能用万用表解决的问题，就不要把它复杂化。 
欧姆龙 CJ1W-IC101 模块特价
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