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Here is a Fair-Play BB-200 basketball scoreboard that I am testing after making some adjustments and cleaning. This is entirely electromechanically-controlled; it has no ICs or semiconductors except for a few diodes.
In the first segment, I turn on and off the bonus lamps. The clunks are coming from the relays inside the scoreboard. Then I add scores to home and visitor. The clunks are from the rotary selectors inside the scoreboard that advance each time I advance the score. The hum heard in the video is not related to the scoreboard -- it is from our overhead paging system.
In the second segment, I turn on the clock start switch on the BB-2 control console. The clicks are from the switches inside the console sending pulses to the scoreboard to advance the rotary selectors to count down seconds. The clunks are from the rotary selectors in the scoreboard advancing.
In the third segment, I removed the cover from the clock pak (located under the "Period" panel in the scoreboard). The rotary selector on top controls the tens of seconds, selector on the bottom controls the minutes. The selector for the seconds units is behind the seconds tens selector.
In the fourth segment, I put one minute on the clock and start counting down. There are no burned out lamps in the clock; some of the contacts are dirty, misadjusted, or broken on the seconds rotary selector. As the clock counts down, I add scores to each side. Then I advance the period lights. Lastly, I turn on the home bonus light. Don't know why the horn didn't sound at the end, though. Either I didn't turn it on or it has another dirty contact.
Kudos to Fair-Play for posting the schematic of this scoreboard on their Web site!
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