Ever playing multiball on one of your Data East games such as JP, LAH, TFTC, Tommy, WWFRR, or GNR and your game loses track of the balls on the playfield or in the ball trough? Sometimes you drain back down to one ball after a multiball mode but the game still thinks you are in multiball? Or you drain all the balls and the game still thinks there is a ball on the playfield and you have to wait for ball search to kick in?
This video describes what your issue might be and how to fix it:
Here is the switch shown in the video:
I want to note that even if your switch is detecting fine, it might still be faulty and I would still recommend replacing it regardless.
Thanks to fellow Pinsider NewPinOwner for informing us all about this issue in this thread: