Quoted from Jahkub:I also encountered problems with the opto on the T-Rex ramp, specifically the ramp exit opto. The rear most board wasn't properly aligned with the hole in the ramp and was causing fast shots not to register. The problem was with the plastic ramp mounting point being more than 90 degrees to the side of the ramp with the hole, causing the opto to be tilted downward slightly and pointing too low. My fix was to loosen the opto board and then shim between the ramp and the board and then tighten it back up. This pivoted the board so that it's now square with the side of the ramp.
Here's an exaggerated image to clarify.
[quoted image]
Edit: It's really easy to check the alignment if you pull the playfield all the way out onto the service rails and then pick up the playfield by the handle on the back. Just lift until you can get a good view of the alignment of the board, you might even need to shim it the other way.
Maybe add this as a key topic for fixing the T-Rex ramp opto eightballtexas?
This post saved me a lot of time troubleshooting, thanks!!