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Carrera Pro-X Lane Changer Problem

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I know it's an old system but I'm fixing up a freebie Carrera Pro-X digital system I was given for the kids to play with. I have managed to get most parts working/repaired however I have a lane changer that won't activate and I'm not sure how I can go about diagnosing what the issue is. When I take the back everything is connected and visually looks ok. When the car goes over the sensor the lane changer does not activate which makes me think it could be a sensor or chip issue. I have a second lane change track piece and that works ok so I know the cars I am testing can activate a lane change mechanism.


Any help on trying to solve the issue would be appreciated.



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