Quoted from PinDeLaPin:
My machine has been pretty much error-free for a year now but we are all know the way things just happen. So if I start a game the mini flipper is running at the slow speed like it should then all of a sudden it will just pick up to the higher speed for whatever reason and stay that way throughout the course of the game. Does anybody know what the sequence is that you have to complete for the mini flipper to speed up? I'm thinking if I track down whatever it is that tells the flipper to go at the higher speed then that is the likely culprit. Stuck switch or intermittent one or a shorting wire is what I was thinking. I'm getting no error messages and everything checks out in switch edge test. Any insight would be appreciated.
I had this exact same problem when I owned this pin. I found that the problem is with the switch being out of alignment with the rotating wheel beneath the playfield. There are three plastic pieces attached to the wheel that have a protrusion on them that are supposed to throw the switch as the wheel rotates. There is a test for this in the Portals that you can check to see if this is working properly. If the switch is not thrown within a particular time period, the wheel will just start spinning at a really high rate of speed. In that case, you can adjust the switch to make sure it registers each time the bump hits it.
Hope this helps.