Episode 137 - The Control Unit - First Switches

For Amusement Only EM and Bingo Pinball Podcast·podcast_episode·9m 20s·analyzed·Jul 26, 2015

Analysis

claude-haiku-4-5-20251001 · $0.015

TL;DR

Technical analysis of Bally bingo control unit timing cams and switch mechanisms.

Summary

Nick Baldridge provides a detailed technical deep-dive into the control unit mechanisms in Bally bingo pinball machines, specifically examining the first rotating cams (A and B) and the drag arm switch (Q) that control timing functions. He discusses how these mechanical components work together to enable timer step-ups and motor timeout features, illustrates differences in switch labeling conventions between earlier and later Bally bingo models, and references his 1971 Double Up machine as a case study. The episode emphasizes the importance of consulting machine-specific manuals due to variations across models.

Key Claims

The control unit in Bally bingos is made up of multiple rotating cams separated by clutches that engage and disengage to allow the machine to function
high confidence · Nick Baldridge, describing control unit architecture in his 1971 Double Up
Cams A and B in the control unit control timing in Bally bingos
high confidence · Nick Baldridge, based on his experience working on Bally bingo machines
Switch Q on the drag arm is the most important switch in the first timing section, as it engages the timer step-up feature
high confidence · Nick Baldridge, describing functionality in Double Up control unit
The randomized nature of switch Q pressing creates variable timeout periods depending on game construction
medium confidence · Nick Baldridge's explanation of how timer step-up works after fifth ball is shot
Bally changed switch labeling conventions from numeric (1A, 2A, 2B) in earlier games (40s-early 70s) to alpha (A1, A2, B1) in later bingo models
high confidence · Nick Baldridge comparing manuals from Double Up and Bounty models
Timing issues in some Magic Screen games are directly related to the A and Q switches in the control unit
medium confidence · Nick Baldridge referencing his previous podcast about Magic Screen games

Notable Quotes

“The control unit is made up of multiple rotating cams which are separated by clutches. The clutches engage and disengage as needed in order to allow the machine to think about various things.”
Nick Baldridge @ early in episode — Core explanation of control unit architecture that enables game logic
“Q is the most important switch in this section. It engages the timer step-up. This is the feature that allows the motor to time itself out after a period of sitting idle after a game has been completed.”
Nick Baldridge @ mid-episode — Identifies critical switch function and explains game timeout mechanism
“The beauty of the control unit's design is how everything works harmoniously together in order to provide the game with guaranteed timer step-ups, for example, even on something that is mechanically rotating and will only occasionally close the switch.”
Nick Baldridge @ mid-episode — Highlights elegant mechanical design philosophy in Bally bingos
“Over the years Bally changed the way these switch stacks were numbered or designated. So you have a switch stack labeled A1... In the earlier games, the switch stacks were numbered instead. So you have 1A, 2A, 2B, etc.”
Nick Baldridge @ late episode — Documents manufacturing/documentation change affecting technician compatibility
“I'm not sure why they made the switch from numeric to alpha for labeling the switches... it would mess up every technician who ever worked on a bingo.”
Nick Baldridge @ late episode — Expresses technical frustration with design change that created field service confusion

Entities

Nick BaldridgepersonBallycompanyDouble UpgameBountygameMagic ScreengameFor Amusement Onlyorganization

Signals

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educational_content_signal: Nick Baldridge continuing a mini-series on Bally control units with detailed mechanical and electrical analysis
high · Explicit statement: 'For tonight's episode I wanted to continue in my little mini-series about Bally's control units'
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restoration_signal: Discussion of how to diagnose timing issues in Bally bingo machines by understanding cam and switch interactions
medium · Reference to Magic Screen timing problems and explanation of how A1 and Q1 switches must operate together for proper timer step-up
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historical_signal: Documentation of Bally's change in switch labeling methodology from numeric (1940s-early 1970s) to alphabetic (later bingo models)
high · Detailed comparison of labeling systems across Double Up (1971, alpha) and Bounty (earlier, numeric) manuals
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operational_signal: Switch labeling change created confusion and compatibility issues for technicians accustomed to numeric system
medium · Quote: 'it would mess up every technician who ever worked on a bingo'
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design_philosophy: Appreciation for Bally's control unit design that enables complex game logic through simple, rotating mechanical components
high · Quote: 'The beauty of the control unit's design is how everything works harmoniously together'

Topics

Control unit mechanics and camsprimaryTiming and motor timeout systemsprimarySwitch design and labeling conventionsprimaryBally bingo machine designprimaryTechnical documentation and manualssecondaryTroubleshooting timing issues in bingo gamessecondary

Sentiment

neutral(0.1)— Nick Baldridge maintains an educational, technical tone throughout. Mild frustration expressed regarding Bally's switch labeling change (shift from numeric to alpha), which he views as counterintuitive and problematic for field technicians. Otherwise positive appreciation for Bally's mechanical design elegance.

Transcript

groq_whisper · $0.028

The The The What's that sound? It's For Amusement Only, the EM and Bingo Pinball Podcast. Welcome back to For Amusement Only, this is Nicholas Baldridge. For tonight's episode I wanted to continue in my little mini-series about Bally's control units and talk a bit about the first pieces That rotate closest to the motor itself. These are in constant rotation as long as the machine is on and not timed out. As I mentioned briefly in the last episode, the control unit is made up of multiple rotating cams which are separated by clutches. The clutches engage and disengage as needed in order to allow the machine to think about various things. Today we're going to be talking about the first two cams which are in every Ballybingo that I've worked on, but there may be some exceptions that I've never worked on. So, the first two, essentially, control timing. By the way, it would probably help to point out that I'm talking about the control unit as found in my 1971 double up. This control unit is a bit larger than most of the others and has some switches which are present only on later model bingos such as the 20 holes. Most of this information is applicable to every bingo but not all of it. So you need to reference your manual for your specific bingo to find out exactly which cams Do what But in DoubleUp case the first two pieces control timing So you have one cam the one that located closest to the motor and that is notated as cam a cam a has a switch stack mounted on top with two switches one of which completes the select Before FifthBall timerUnit step-up and the second opens the circuit to the MixerLatch relay then there's a second cam labeled B and B has a switch stack with a single switch and that switch completes the circuit to the Multiplay relay When you put in a coin. Then you have the dragarm, which is located on the front of the control unit with its own switch, Q. Q is the most important switch in this section. It engages the timer step-up. This is the feature that allows the motor to time itself out after a period of sitting idle after a game has been completed. So this switch labeled Q on the drag arm is only really active Once your fifth ball has been shot and due to the randomized nature of how often that switch is pressed it will take a variable amount of time to time out your motors depending on the game's construction. Now, one thing that I didn't talk about in my scoreMotor series which I am remiss In not discussing is how they're labeled in the manual. So let take a look at the manual here for DoubleUp And as with every Ballybingo the manual is fantastic and gives you a lot of information The switch stack, which is closest physically to the motor, the part that actually turns all these cams, is always going to be first. That is usually where the motor index switches on a typical score motor. But in looking at this Ballybingo, you have switch stack A, which is located on the cam right beside the motor, and then switch stack B is located right next to the clutch, which is physically a bit away. Now the beauty of the control unit's design is how everything works harmoniously together in order to provide the game with guaranteed timer step-ups, for example, even on something that is mechanically rotating and will only occasionally close the switch. Now if you listen to my podcast about the problem with MagicScreen games and how certain ones have an issue with the timing, these are the switches which are directly involved with the timing. And looking at the manual, you've got A1, which is only labeled as such in later model bingos. And then you've got Q1, and those have to operate together in order to actually step up the timer. Now, here's an interesting thing. Over the years Bally changed the way these switch stacks were numbered or designated So grabbing the manual for my bounty let flip that open and we got the control unit Now if you recall just a few moments ago we have A switch stack labeled A1, so you have Cam A, Cam B, etc. In the earlier games, the switch stacks were numbered instead. So you have 1A, 2A, 2B, etc. And I'm not sure why they made the switch from numeric to alpha for labeling the switches. The only thing I can think is maybe it was friendlier for people who were not numbers people for whatever reason, but it doesn't make a whole heck of a lot of sense to me. The numeric system worked just fine and it was in use for so many years. Upkick From the 40s to the early 70s, I have no idea why they would do that. It would mess up every technician who ever worked on a bingo. Well, that's all for tonight. Thank you again for joining me. My name is Nicholas Baldridge. You can reach me at 4amusementonlypodcast at gmail.com or you can call me at 724-BINGOS1. That's 724-246-4671. You can listen to our show on iTunes, Stitcher, Pocket Casts, via RSS, on Facebook, on Twitter, at bingopodcast. You can follow me on Instagram at nbaldridge or you can listen to us on our website which is For amusement only dot libsyn dot com. Thank you very much for listening and I'll talk to you next time.