A sound or speech word is missing, or comes and goes.

Missing words or sounds from cracked connector pins

Cause: Cracked solder joints or tarnished .156" header pins on sound board connector 10J3, on driver board 2J9 (System 3-6) or CPU board 1J8 (System 7).

Checks

• Inspect the header pins.

Fix

• Resolder the pins; replace corroded or tarnished ones.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Setting up a sound board for speech
• Speech board faults
• Speech cuts in and out when the ribbon cable is moved
• System 6/7 sound and speech board ROMs
• Sound board jumpers for sound-and-speech games (2K ROM)
• No sound effects in play though speech works: check the sound board PIA
• Sound effects work but speech is missing or very quiet: replace the speech board op amps
• 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)