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Stern 5 Balls Missing Error


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Hi all,

I'm currently tidying up The Simpsons Pinball Party (Stern Whitestar system) and fixing any small problem. When the game arrived, the game would be powered on and it would immediately do a ball search with "5 Balls Missing" on the DMD. I checked all the ball trough switches and they tested ok. I narrowed the problem down to the two opto boards in the ball trough.

 

After re-flowing solder on the boards, this did not fix my problem. I ended up replacing both boards for longevity.

 

Now when I turn the machine on, it boots with no errors. Problem solved!

 

Cheers!

Adam.

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  • 4 weeks later...
  • 1 year later...

Hi,right now I'm having the same problem on my Sega Harley-Davidson pinball, when I saw your post about the problem that you were having I changed out the receiving opto board but that did not seem to help, when I turned the machine on it shoots out three balls and then it says there's a ball missing, what I would like to ask you is are the two LED bulbs supposed to be lit up on the new receiver opto board that I installed, what I did now was order a new set of opto boards and will replace them, if that does not work can you suggest anywhere else to look to resolve this problem.

 

Thank youi

Barney

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