Had a Bally Eight Ball Deluxe in for repairs that I recently finished up. It was only getting 6 flashes at bootup, missing the 7th and final flash which usually points to a loss of the +43vdc or the U10 or U14 chips are bad.
This game was missing +43vdc from a blown fuse at F4 on the power board. One of the solenoids had grounded out sending a spike back. While I had the game in the shop, I put a new ball in, upgraded the solenoid driver board with a new 15,000 mfd 25v cap and ran the two recommended jumpers, and went through all solenoids and switches to make sure everything was functioning correctly. Game is now back home in VA doing what it should!
Yr the Man !!