Want to know which transistor drives which coil? Which SCR drives which lamp? Got a coil that won't fire or a burned out lamp or two? Here's a bunch of tables for as many Bally Machines as I have schematics for that will help you figure out which component is at fault.

I plan to add more machines as time permits and as I get more information. If you have information on machines that I don't have listed here, please send it to me and I'll post it here too.

Solenoid Driver

Early solid state machines by Bally used one of the following Solenoid Driver Boards (both are equivalent as far as the driver transistors and connections are concerned):
AS-2518-16
AS-2518-22
The solenoid driver uses transistors to drive the various solenoid and relay coils on the machine. These transistors are TIP-102 and are located in a row along the bottom edge of the circuit board. There are 19 circuits, which implies the board can drive up to 19 different solenoid or relay coils. They are very easy to repair once the proper component is located. Clay's Bally Repair Guide tells how to identify shot solenoid transistors. If you'd like to find out which driver transistor goes to which driver connector pin, Click Here. I recommend that if you change out a driver transistor, you also change out the associated 1N4004 diode and the 330-ohm resistor (1/4 watt) too. Click Here for more information on how this circuit works.

Note: The Solenoid Driver Board also contains the 5VDC filter and regulator circuit for the machine's logic circuitry and the 190VDC filter and regulator circuit for the displays. These areas are not discussed here.


Lamp Driver

Early solid state machines by Bally used one of the following Lamp Driver Boards:
AS-2518-14
AS-2518-23
The lamp driver uses SCRs (Silicon Controlled Rectifiers) to drive the various controlled lamps on the machine. There are two different types of SCRs used; 2N5060 (for single lamps) and MCR-106 for multi-lamps. Both behave in a similar manner, one is just a little more heavy duty. There are 60 circuits, 36 using the 2N5060 SCRs and the other 24 using the MCR-106 SCR. They are simple to replace once the bad ones are located. Clay's Bally Repair Guide tells how to identify shot SCRs. If you'd like to find out which SCR goes to which connector pin, Click Here.


Aux Lamp Driver

Later solid state machines by Bally sometimes used an auxiliary lamp driver board to control additional lamps.
AS-2518-43
AS-2518-52
The auxiliary lamp driver also uses SCRs to drive additional controlled lamps on the machine. These additional SCRs are MCR-106, so they have the capability of driving one or two lamps each. They are simple to replace once the bad ones are located. Again, Clay's Bally Repair Guide tells how to identify shot SCRs. If you'd like to find out which SCR goes to which connector pin, Click Here.


Click on a machine to see the info:

6-Million Dollar Man Baby Pac-Man (later) Black Jack Black Pyramid (later)
Centaur (later) Centaur II (later) Cybernaut (later) Dolly Parton (later)
Eight Ball Eight Ball Deluxe (later) Elektra (later) Embryon (later)
Evel Knievel Fantasy (later) Fathom (later) Fireball Classic (later)
Fireball II (later) Flash Gordon Fly High (later) Freedom (later)
Frontier (later) Future Spa Genesis (later) Gold Ball (later)
Grand Slam (later) Granny & the Gators (later) Harlem Globetrotters Hot Doggin' (later)
King of Steel (later) KISS Lost World Mata Hari
Medusa (later) Miss World (later) Mr. & Mrs. Pac-Man Mystic (later)
Night Rider Nitro Groundshaker (later) Paragon Playboy
Power Play Rapid Fire (later) Rolling Stones Silverball Mania
Skate Ball Space Invaders Speakeasy (later) Speakeasy 4 (later)
Spectrum (later) Spy Hunter (later) Star Trek Strikes & Spares
Supersonic Vector (later) Voltan Escapes (later)
Xenon X' and O's (later)    
 
If you're not up to repairing your Bally yourself, then please
check out my Bally Repair Page



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Created 9/12/02 - Last Modified 12/30/10 - Steve Kulpa Mail Icon Nolensville, TN
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