The easiest way is to put it into a robot to test. If the robot powers up ok and you can jog it then the chances are the SMB is OK. I have seen some units fail on older 6000s which will give you a sync error intermittently, and once on a 6400R I saw a faulty SMB cause the robot to be unable to reach a fine point. It had me puzzled for quite a while. There was an intermittent unusual sound from the robot when this happened. Standing beside the robot while jogging it you could feel a vibration. Replacing the SMB solved the problem.
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