No speech? Check the speech board pot
Speech games have a pot on the speech board that balances synth sound against speech; turned fully up it gives all sound and no speech. Overall volume is a separate pot inside the coin door.
Systems
Related tips
- Setting up a sound board for speech
- Replacing the speech board ribbon cable
- System 6/7 sound and speech board ROMs
- Sound board jumpers for sound-and-speech games (2K ROM)
- Getting speech from a board with a 55536 speech chip
- System 9 sound and speech boards fit System 6/7
- Sound and speech board sockets need checking too
- Speech very faint on a type 2 board
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)