Contrast sensor over travels

I recently replaced the R2 relay for my gerber m series 3000. We also had to buy a new contrast sensor because the old one would not turn on anymore. It has been installed and we have calibrated it according to the manual step by step. I have made a sample test print of just black dotted targets. I have lined up the sensor with the first target and have set the new origin. I ran the program and always the sensor over travels to the right by about 2 inches or so. Doesn't read any targets. Is there something else that could trigger the over travel?


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