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Essilor Kappa tracer Error code N11

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I am using Essilor Essilor Kappa tracer, the Error code is N11, the problem is the blocking arm stuck in the middle of the blocking path. It can not go back to the initial position.I restart it ,the arm can move,from the stuck position to the position when the arm is blocking which is on the top of the lenses. but do not go back to the initial position which is supposed to be when it is not blocking.


what can I do to fix this problem?



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