Getting speech from a board with a 55536 speech chip

Steps

• This applies to newer speech boards with the 55536 chip instead of the 55516, which may give no speech in System 6/7 games.
• Solder one leg of a 0.01 uF capacitor to the speech clock at its plated-through hole on the back of the board, and run the other leg to IC5 pin 12 (the upper right PROM seen from the front), so the cap sits between the clock and ground.
• This lengthens the speech trigger and cures many speech faults.

Systems

• Williams System 6 / 6A
• Williams System 7

Related tips

• No speech? Check the speech board pot
• Replacing SRC6 with a plain bussed resistor network
• 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)
• System 9 sound and speech boards fit System 6/7
• Sound and speech board sockets need checking too

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)