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DLP4710EVM-LC: 光机无法触发拍照

Part Number: DLP4710EVM-LC
Other Parts Discussed in Thread: DLPC3479

您好,这款光机DLP4710EVM-LC,现在我们用万用表测量输出信号电压,用UI 控制光机投影触发信号,投影前后万用表数值都没有变化。我们换了个相机与光机连接,还是无法触发拍照。请查看下面组图片。请看一下是哪里的问题呢?麻烦告知解决方案,非常感谢!

还有,引脚的1和4是哪个呢?说明书上没看懂。