(Topic ID: 306020)

Gottlieb Big Top scoring problem

By SilverLiningMan

8 months ago



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  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 8 months ago by SilverLiningMan
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Gottlieb Score Motor 3 (resized).jpg
pasted_image (resized).png
93968857-F053-45C8-84AA-7074FD35D2E4.jpeg

#1 8 months ago

Hi everyone,

I am working through a 1964 Big Top and am close to having everything working thanks to MarkG and the EM online clinic gurus. One final issue is that the game scores 400 points when a bottom out lane rollover is lit for 300. This happens almost every time regardless of which side is lit…although once in a blue moon (about once every 50 tries) the game actually scores the 300 points correctly.

Would anyone be able to help me troubleshoot this? I’ve been diving into the schematic but I’m still on the steep end of the learning curve with those. Here’s the part of the schematic that I *think* is the correct place to look, but I’m not sure. Thanks in advance for any ideas you might have.
93968857-F053-45C8-84AA-7074FD35D2E4.jpeg

#2 8 months ago
Quoted from SilverLiningMan:

the game scores 400 points when a bottom out lane rollover is lit for 300.

One of these two motor switches is gapped too tight.

pasted_image (resized).png
#3 8 months ago

Thanks Howard. You were exactly right, 2C was a tad tight. Very much appreciate your help.

#4 8 months ago
Quoted from HowardR:

One of these two motor switches is gapped too tight.
[quoted image]

(Learning), Now that 2C is opening what is the new correct path to score those 400 points?

#5 8 months ago

The path HowardR highlighted is intended to score 300 points (not 400 points). If you look at the circuit there are three Score Motor switches in series. The one on the right (Motor 1A) generates 5 pulses, or one pulse every time it closes as shown in a typical Gottlieb motor chart:
Gottlieb Score Motor 3 (resized).jpg
The two other motor switches (2C and 1B) open briefly to block one of the five pulses. Motor 2C blocks the second pulse from Motor 1A, and Motor 1B blocks the fourth pulse. (Notice how their blocks in the chart overlap.) So only the first, third and last pulse from the Motor 1A switch get to the Q or 100 point relay.

The animation at https://www.funwithpinball.com/resources/animated-schematic-diagrams shows ways to get various numbers of pulses from the Motor 1A switch.

/Mark

#6 8 months ago
Quoted from MarkG:

The path HowardR highlighted is intended to score 300 points (not 400 points). If you look at the circuit there are three Score Motor switches in series. The one on the right (Motor 1A) generates 5 pulses, or one pulse every time it closes as shown in a typical Gottlieb motor chart:
[quoted image]
The two other motor switches (2C and 1B) open briefly to block one of the five pulses. Motor 2C blocks the second pulse from Motor 1A, and Motor 1B blocks the fourth pulse. (Notice how their blocks in the chart overlap.) So only the first, third and last pulse from the Motor 1A switch get to the Q or 100 point relay.
The animation at https://www.funwithpinball.com/resources/animated-schematic-diagrams shows ways to get various numbers of pulses from the Motor 1A switch.
/Mark

That is sure handy. Thanks Mark and all—this really helps to put some missing pieces of knowledge together for a greenhorn like me.

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