(Topic ID: 254502)

Gottlieb Roto target scores correct but bell rings -1?

By 4Max

1 year ago



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  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by HowardR
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Match predictor (resized).jpg
Capture2 (resized).JPG
Capture4 (resized).JPG
Capture1 (resized).JPG

#1 1 year ago

Hi, looking for help again on my Hi Dolly.

The Roto target scores correctly, for all numbers, but only pulses the 0-9 unit (with the bell) one less than it should, so 4 times for the 5 target (but adds 5 to score), 3 for 4, etc and none for 1 (again, the score reel moves 1 correctly). This occurs regardless of left or right roto target switch, and regardless of first or second player.

Here's the relevant part of the schematic.

Capture1 (resized).JPG

I have checked all the score motor switches and "appear" good. I figured easiest test is on the 5 target (my red "1" above) as then simply the 1A should fire 5 times (red "2") until 4C Opens (red "3")

But when I manually turn the score motor, with a meter on 1A, I notice that 4C closes just before the final close of 1A. As far as I can see, all the score motor switches are screwed in tight, clean, etc and nothing looks obviously wrong?

Photos of score motor:
Starting position, 4C closed (red arrow)
Capture2 (resized).JPG

Just before motor comes to rest point - 4C opens (red), but 1A firing one last time (blue - the switch is not visible its on lowest row of motor)
Capture4 (resized).JPG

As usual I must be missing something simple/stupid! Ideas?

#2 1 year ago

I've seen this kind of thing on other games (maybe Olympics or Rack A Ball?) where the score is what you'd expect but the chime is off by one. I've chased it down once or twice and convinced myself that that is the desired behavior. The only thing I could think of was that the designers were trying to make it harder to predict the match value.

Since the match was often driven by the 00-90 unit you could predict the value of the match number if you could figure out the order in which the match numbers appeared on the stepper contact disc. Once you knew the order you could just remember the last match value and look at the 10s digit to figure out how many steps the 00-90 stepper had taken. Driving the 00-90 unit fewer times than the score reel that would make it much harder to track how many steps the 00-90 unit had taken and therefore what the next match number would be.

That's my theory anyway.

Oddly enough this came up recently on facebook. Someone posted an image of a match predictor that arrived with an issue of the Pinball Trader. Here's mine:
Match predictor (resized).jpg

/Mark

#3 1 year ago

Well first MarkG thank you for your answer (again) and secondly maybe saving me hours (months) of pain! Your theory is fascinating... and that Gottlieb assumes pinball players would struggle with arithmetic that was target - 1 . Thank you as always.

#4 1 year ago
Quoted from 4Max:

Well first markg thank you for your answer (again) and secondly maybe saving me hours (months) of pain! Your theory is fascinating... and that Gottlieb assumes pinball players would struggle with arithmetic that was target - 1 . Thank you as always.

I'm sure Gottlieb got complaints. When I had my pinball arcade, two college guys figured out how to make my Gottlieb "300" match.

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