ICPMS 7850 Autosampler SPS4 Z axis collision error


I am using ICPMS 7850 with autosampler type SPS 4. I got an error saying that autosampler Z axis collision error and the probe is resisting to go to downward position. I shut down the autosampler and turned on and it's remain same. But the probe is conveniently moving in X and Y axis direction. I would like to ask for any suggestions to calibrate or trouble shoot this issue. 



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