Remember, electrolytic and tantalum capacitors are polarized. Make sure you are installing them correctly. Same goes for the voltage regulator.
Here is some repair info:
http://www.pinwiki.com/wiki/index.php?title=Bally_Home_Models
Here's a picture of a rebuilt series 2 power supply board you can compare to:
http://www.pinwiki.com/wiki/index.php?title=File:Bally0614-00912.jpg