Found this in the cabinet of a newly aquired Comet. It is wired to a switch which activates when the coin door is opened/closed. This machine used to be on route. Some sort of burgler alarm perhaps?
I had something similar in an Aladdins Castle along with a nice mouse hotel.
I figured it was an alarm to let an OP know if someone opened the game door. Ran on a battery.
That looks like a smoke detector to me, right? Guess if its an infrared version, you could put an object in it to break the internal light beam and then any time you powered it up, it would sound the alarm. So its powered and activated by opening the door. Pretty ingenious idea and only costs about $20!
Three Bally - 17 MPUs, two SDBs, and two lamp driver boards. The machine had Altek boards installed at MPU and SDB, so a pretty good deal for $250. Lamp driver boards are repaired now, one SDB repaired, and the others in the queue for repairs. (Acid damage and bad sockets on MPUs. ) Machine cleaned up and works well.
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