The game will not boot after fitting a new Rottendog solenoid driver board, though the same driver works in other Bally games. With an original Bally driver board the game boots.

No boot with a Pinball Lizard MPU and Rottendog driver: use the original driver

Cause: The Pinball Lizard replacement MPU fitted in this game would not work with the Rottendog driver board; it needed an original-style driver board.

Checks

• If a game has an unusual replacement MPU, try the new driver board in another game and an original driver board in this one to find the mismatch.

Fix

• Pair the Pinball Lizard MPU with an original Bally driver board (or change the MPU).

Systems

• Bally MPU AS-2518-35

Games

• Supersonic

Related tips

• How the MPU sees the 43 V solenoid supply
• Bally MPU loops through its 7 flashes and resets: check R134 and the interrupt traces
• Spare MPU and driver chips with their locations
• ROM and EPROM types used on Bally MPUs
• Get the MPU booting before you change any ROM jumpers
• Bally -35 MPU jumper settings by ROM type
• Game will not boot, or MPU damaged, after swapping -35 and -133 boards
• Bally -35 MPU jumpers for 2732 plus 2716 and other mixed sets

Source: Pinball Repair help group!! (Facebook group)