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DS90UB926 lock失败

你好,我按照用户手册连接DS90UB926,FPD连接DS90UB949,电源接3.3V,S1和S2设置正确,但是lock灯不亮,锁定失败,pass灯亮,想问一下,这个问题可能是什么原因造成的?