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Sokkia total stations are repaired using Sokkia proprietary computer software. You need to return it to a Sokkia shop, no other shop will be able to corect this, not even Topcon (even though Topcon bought Sokkia).
I believe the GTS-6XX series is the non robotic version of the GTS-8XX series. And E-99 in the GTS-8XX series is when the station cannot write to it's internal memory. Try resetting it. If it comes up with the same error, the ABS circuit board needs to be replace. Unfortuinately parts have not been available for that unit for a long time.
The lock on almost any Digital Theodolite or non-robotic total staton is very similar. It's an rotating shaft with an side ways egg shape at the end. As you turn the knob the oblong end pushes on a pin or some sort of friction device that is attached to the axis. Often what will happen is either the position of the lock shaft moves, so it reaches a limit before enough friction is applied to the axis. Or some part of the lock is jammed and is not pushing into the axis.
It should be visible behind the display, and there should be 2 set screws on the bottom of the instrument below the lock (on the outside, not behind the screen) Most likely backing thoes off, just a little bit will give you enough movement to watch internally where you can find a new lock position, and tighen the setscrews again to hold it in place.