Power-on sound tones and what they mean
At boot: no sound means the sound board is not running or the audio path is broken (cable, amplifier, speaker). One tone: sound system OK. Two tones: sound RAM fault. Three tones: U4 fault. Four tones: U19 fault. Five tones: U20 fault (System 11C).
Systems
Related tips
- Which System 11 sound board each game uses
- Using a D-11581 sound board in other System 11 games
- The D-11581 sound board: chips and ROMs
- D-11297, D-11298 and D-12338 sound boards
- Sound circuits on the 11A and 11B CPU boards
- Game-over music missing: reflow the sound board header pins
- Constant hum instead of sound: shorted capacitor C26 on the sound board
- Loud constant hum that the volume control does not change
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)