How System 3-6 games trigger sounds
Five solenoid driver transistors ground inputs on the sound board, and each combination of the five gives a different sound (up to 31 plus silence). Sound 0: solenoid 9 (Q31), driver 2J9-9 feeding 10J3-3. Sound 1: solenoid 10 (Q33), 2J9-7 to 10J3-2. Sound 2: solenoid 11 (Q35), 2J9-1 to 10J3-5. Sound 3: solenoid 12 (Q37), 2J9-2 to 10J3-4. Sound 4: solenoid 13 (Q39), 2J9-3 to 10J3-7.
Systems
Related tips
- System 3/4 sound board jumpers for 7641 PROM vs 2716
- 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
- Leon sound board test EPROM
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)