Type 1 and type 2 sound boards and their switches
Type 1 is the long board in the lower cabinet on System 3/4 (and in the backbox of some early System 6 games), with SW1 test and SW2 sound select. On System 3 boards a red toggle chooses chimes or electronic sounds; it can change to chimes while running but only goes back to electronic after a power cycle. Type 2 boards (late System 6 and System 7) are in the backbox.
Systems
Related tips
- Using the sound board test switch
- Using a 6802 on a type 2 sound board
- Sound EPROMs work in either sound board type
- Reducing hum on a type 1 sound board
- Leon test: type 2 sound board RAM IC11
- Hum from a type 1 sound board
- Which sound board each game uses
- Sound board jumpers for 2K sound-only games
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)