New Pin owner. HELP!Bally Supersonic 1979

evilgrizz

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I recently aquired a Bally Supersonic (1979) machine from an auction. It as bought for me in working condition, but upon delivery it no longer works. I am VERY new to the pinball world. The machine lights up, but no sounds play, nor can I get any credits by working the coin mech either by hand or with quarters. I do see where a battery has started to leak on it, but when checked with a volt reader it does have power. Im not sure if something was jarred loose during tansport as it took a 4 hour trip. I can provide pictures if needed. Please help!
 
Anything from the score displays? If not, sounds like the mpu is not booting up. How many times does the LED on the mpu board flash when the game is powered on?
 
displays

The displays light up but do not show any numbers. The green led does nothing. The battery on that MPU board does have corrosion, but shows up on my volt reader.

Anything from the score displays? If not, sounds like the mpu is not booting up. How many times does the LED on the mpu board flash when the game is powered on?
 
how?

Do I take the board off and clip the connectors? Or can I leave the board attached? I know nothing other than what I hav learned on here and the web. Thanks!

UOTE=Syco54645;2186976]Remove the leaking battery now.[/QUOTE]
 
Do I take the board off and clip the connectors? Or can I leave the board attached? I know nothing other than what I hav learned on here and the web. Thanks!

UOTE=Syco54645;2186976]Remove the leaking battery now.
[/QUOTE]

You can remove the board but clip the negative lead first just to be safe.
 
Check the large plastic connector (J3) on the rectifier board (as seen in photo below) for browning or discoloration. Especially at pin 8 terminal. When counting from left to right, pin 8 is the one directly after the blank (key) spot. That is the connector that sends 11.9VDC to the solenoid regulator board. I found that wire connection loose on my supersonic pin. It caused the connection to draw high amperages, which in turn, caused it to burn/melt the plastic connector which then caused it to loose the connection entirely. My game stopped working just as you described, so it might be worth a shot.

If nothing there then, check the connector at the top right of the solenoid driver board (as seen in photo below). Again, connector J3. It carries the 11.9 VDC from the rectifier board's pin 8 on the J3 connector to the solenoid driver board's pin 12 on the J3 connector. Check for complete continuity between pins or connector malfunction. Check for cold solder points on the back of both boards. Especially behind the pins.

In addition, as suggested, removed the battery from the MPU immediately. Carefully remove the connectors fom the MPU, and unscrew the board from the metal clips. Take the board to a well lit place, and carefully inspect the solder side of the board. Take note of trace flaking, corrosion, and component acid saturation. Repair as needed. Mine was so bad I had to replace it. The entire ground traces were lost, and multiple component were saturated in acid. I replaced my MPU with the Universal Bally/Stern board from arcadeshop.

As a suggestion, I would completely rebuild the solenoid driver board. I found both capacitors on my board testing at 0 microfarads. In the solenoid driver board photo below you'll observe that it has been rebuilt.

I am tired now. Hope this helps.
Greg-

RECTIFIER BOARD
93cea5b5fca3dcad28feae6b060a35e9.jpg


SOLENOID DRIVER BOARD
ccf86b4ec72de71883fe982f04bddf57.jpg


UNIVERSAL BALLY/STERN MPU BOARD
http://www.arcadeshop.com/mpu-old/New_Board.jpg
 
checking boards...

Okay thank you so much! i will do this as soon as I get off work. ill post the results. Thanks again!
 
I think it is the connector at the top right of the solenoid driver board. When I unplugged it the pinball made some sounds and when i plug it back it it starts to make sounds as well. The other connector was brown as you said and the wire is actually melted onto the connector. i will take the board off this weekend to inspect it better. thanks to everyone for their help!
 
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