The game plays the wrong sound for an event.

Wrong sounds play

Cause: One of the five sound lines is never grounded or is stuck grounded, so the combinations come out wrong. On System 3-6 that is usually a bad or missing driver transistor or a connector fault; on System 7, the CPU board sound PIA.

Checks

• Ground each sound driver tab and diode-test the transistors.
• On System 7, check the PIA at IC36 (the Leon test EPROM can confirm it).

Fix

• Replace the transistor, connector pins or PIA.

Systems

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

Related tips

• How System 3-6 games trigger sounds
• Use the solenoid test to check the sound lines
• System 7 sound select connector 1J8
• Background sound never stops at game over: sound-line driver chip
• Garbled sound at game start and no background sound: driver board header joints
• Sound test fine but many game sounds missing: a sound line stuck on
• System 7: Leon's code also exercises sound PIA IC36
• Missing words or sounds from cracked connector pins

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