Extra sound lines on World Cup and Disco Fever

On World Cup and Disco Fever sound 4 goes to 10J3-8 rather than 10J3-7. World Cup also uses solenoid 7 (Q27, 2J11-2) to 10J3-6, and both use solenoid 15 (Q43, 2J9-5) to 10J3-7. Shuffle alleys also differ.

Systems

• Williams System 3

Games

• Disco Fever
• World Cup

Related tips

• World Cup will not boot on standard white flipper ROMs
• Use the solenoid test to check the sound lines
• Which sound board each game uses
• Using the sound board test switch
• Powering a sound board for testing
• The sound board is its own computer
• Type 1 and type 2 sound boards and their switches
• Sound board completely dead

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