The game is silent.

No sound at all

Cause: Sound option switches on the control board, the volume control, the sound board fuse, a missing supply on the sound board, a bad speaker, or the sound board.

Checks

• Check control board option switches 25, 26 and 27.
• Check the volume control on the bottom board.
• Check the sound board fuse on the bottom board.
• Measure +5 V, +12 V and -12 V DC on the sound board.
• Measure about 8 ohms across the speaker terminals.

Fix

• Correct the setting, fuse, supply or speaker fault; otherwise replace the sound board.

Systems

• Gottlieb System 80

Related tips

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

Source: System 80 Service Manual, Gottlieb