Hi. read my other reply. It is the connection and allignment of and on the assembly. When you look at the parts, when you load a tape and the casing is closed, some steel sensors will close or open some circuit under the assembly. I presume the moving lever did not make the proper contact and this causes the cam to fail. I looked at my faulty returned parts by sony and strongly suggest that this might be the reason. That is why it says remove tape and load again. hoping that the sensor will connect again. also the repeated action might cause the sensor to be cleaned and thus unsuring a connection.

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