The Markem Imaje fiber photocell sensor connection maybe different from the one you installed before, probably new version. Here is a video of how to connect the A45638 Product Sensor Diffuse Proximity, A16470 Optical Cable.
If your connector is not the same as the one in video, please feel free to send us a picture or video of your photocell sensor, we will see how to connect it.
L&S CIJ Codification Parts 