Quoted from Coyote:The 'Trough Prox Switch' error will be flagged if:
(1) The sensor is stuck on when the game knows there are no balls in the trough. (i.e. Multiball, all balls are on field, and that switch is on.)
(2) The game serves you a single ball, and then later that ball is determined to be a Powerball (by shooting Piano or Dead End or Camera).
(3) Reverse of #2 - no indication it's a steel ball, and the game determines it's a powerball by shooting the same tunnel.
For #1, the error is pretty instant. For #'s 2 & 3, it takes a few repeated tries at it before it flags.
Since it's happening when you're emptying balls, likely it's #1 above - you're hitting or the wired connection is loose, getting the switch 'stuck on', you empty balls and the game sees this, and sets the error.
Thanks. I don't think it is appearing as I empty the balls, if that makes sense. I empty the balls, do whatever I was going to do, then add them back in again one by one in order (2 steels, then the Powerball) and use the Gumball Test "Load 1 Gumball" option to fire those 3 back into the gumball machine. I then add the remaining three steel balls which just sit in the trough. I suppose I could just drop all of the balls into the trough and let the game fire 3 back in when it detects there are none in the gumball machine.
At this point I'm fairly certain no error has been registered. I will start a game and then at some point during that game, or a subsequent one, out of the blue I will get a credit dot (no other indication of an error). When cycling the menu at that point I'll get the test report with the Switch 26 error.
I'm fairly certain from your list that it's not 2 or 3 because the Powerball is in the gumball machine at that point. The error appears even when the Powerball is not even in play. The last time the error appeared I just carried on playing until I got the Powerball out of the gumball machine - the game detected it when it was released via whatever switch is up there, then I let the Powerball drain and cycle into play. When it cycled into play the game announced it in the trough and the error was no longer recorded.
Hope that makes sense.. basically the error was cleared without any kind of adjustment to the eddy switch.