Sounds are missing or wrong.

Some or all sounds missing

Cause: The sound commands start on the CPU board (Z31, out on J4) and are buffered on the driver board (Z13) before reaching the sound board, so any of the three boards can be at fault. The 6532 on the sound board is also a common failure.

Checks

• Try a known good 6532 on the sound board and see if the symptom changes.
• Check CPU chip Z31.
• Check driver board Z13: if it is bad no sounds are ever triggered.

Fix

• Replace the failed chip.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• Replace C33 on the speech and sound board
• The System 80 sound board generations by game number
• Haunted House and Black Hole sound board DIP switches
• No sound and a burning smell from the sound board: diodes, then the board
• Sound supply fuse F8 blows after the game runs a while
• Sound aux supply keeps blowing its 2N6059: shorted capacitor on the 30 V rail
• The wrong sounds or tunes play
• Haunted House: no sound 16 in the sound test

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)