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(Topic ID: 205738)

Williams System 11b Ball Trough Issues

By pinball_player

2 years ago

Topic Stats

  • 8 posts
  • 6 Pinsiders participating
  • Latest reply 2 years ago by ChrisHibler
  • Topic is favorited by 1 Pinsider


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#1 2 years ago

I have an issue where my machine sometimes will launch two balls into the trough at the beginning of a turn. The issue is intermittent and occurs most often when one ball is locked in the left diversion ramp (whirlwind). I see there are three switches under the apron and a fourth in the trough. Any idea which combination tells the CPU that there is "no ball" in the trough causing the second to be kicked? Each of the four switches mentioned move freely and appear to 'click' at the point they should be triggered.

#2 2 years ago

You don't have an extra ball loaded in the game by accident do you? Happened to me once when i dropped a third ball in taxi after doing some work on it #1+2=4 Long shot if you say its intermittent but hey worth a check.

Beyond that have you done a switch test? Check the ball lock switches on the left too.

#3 2 years ago

I had the same thing on my earthshaker always ball one would load two. I made sure switches were clean and able to move and it stopped. I just moved them with my finger and made sure they were able to register. I hope it doesn't come back because I didn't do anything special.

#4 2 years ago

Did you check the shooter lane switch and diode?

#5 2 years ago

I had this same issue on one of my machines. One of the trough switches was snagged on a wire under the playfield so it was always on.

2 weeks later
#6 2 years ago

OK - Problem solved and it turned out to be somewhat of a head scratcher. The machine was launching two balls into shoot lane only when one ball was locked for multiball. After replacing the outhole and ball trough switches, I still had the same problem - and now multiball was ending early when the first ball was drained in the outhole. I then traced all the wiring diagrams per the instruction manual only to find out that the signal wires to number 1 and 3 trough switches were juxtaposed. Now that it is wired correctly everything is working like a charm. Wish the last owner knew how to read a schematic....

Thanks for the help and input.

#7 2 years ago

Good job and congratulations.

#8 2 years ago

Prior work...always suspect...nice work!
Chris Hibler

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