The original sound board self-test only works with S1 and S2 set opposite

The push-button self-test on the original System 80 sound board makes a sound only when its two option switches S1 and S2 are set to opposite positions. If both are on or both off, pressing the button gives nothing even on a good board.

Systems

• Gottlieb System 80

Related tips

• How the original System 80 sound board makes sound
• Supplies on the original System 80 sound board
• Original sound board option switches S1 and S2
• Fitting the original sound board PROM
• Fault-finding the original System 80 sound board
• Distorted sound
• The wrong sounds or tunes play
• Original sound board connector A6-J1

Source: System 80 Service Manual, Gottlieb