(Topic ID: 226831)

Grand prix help


By nocreditdot

1 year ago



Topic Stats

  • 11 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by zacaj
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

I have this grand nearly 100 percent working. I'm down to the last issue. One of the 4th player digits won't reset on startup. It just doesn't move. However if I zero it out manually and play the game it score just fine. So it's not the coil. It is one of the digits that does not have the bakelite board. Where do you think the issue would be?

Thanks
Mike

#2 1 year ago

Cleaned the contacts on the score reset relays?

#3 1 year ago

No I have not. So I should check the test relays I take it?

#4 1 year ago

Check the last few pages of the manual, find the contact for your specific reel and make sure it's clean and making contact properly: https://www.ipdb.org/files/1072/Williams_1976_Grand_Prix_Manual.pdf

Does the game start without the reel being reset or do you need to put it to zero before the game will start?

#5 1 year ago

Which digit is it?

#6 1 year ago

I have to put it to zero. It does score correct in game mode

#7 1 year ago

On the chance that you were replying to me, which of the 10, 100, 1000, 10000 or 100000 digits is it?

#8 1 year ago

4th digit from the left. The 100s

#9 1 year ago
Quoted from nocreditdot:

One of the 4th player digits won't reset on startup

Quoted from nocreditdot:

4th digit from the left. The 100s

Inspect and diagnose this circuit with Alligator clip jumper wires.

Pinball (resized).png
#10 1 year ago

Thanks guys.. it was actually a cold solder joint where the wire attached to the switch. I cleaned all the contacts until found that. Feeling my way through my first EM project. Good news is cosmetically I will have a nice grand prix.

#11 1 year ago
Quoted from nocreditdot:

Thanks guys.. it was actually a cold solder joint where the wire attached to the switch. I cleaned all the contacts until found that. Feeling my way through my first EM project. Good news is cosmetically I will have a nice grand prix.

Very common on williams. Always give em a tug!

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