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OPA847电路输出

已经焊好了,一个两级运放,放大倍数20*5.但是不能正常工作,在没有输入的情况下,第一级输出有3点几伏。经检查,电源供电正常。是个4层板,中间两层是正负电源,外面两层是地。求问为什么?原理图和手册中的电路图如图所示