Only a few sounds play (start-up jingle, pop bumper noise); no speech or music. Swapping in a new sound board and another known-good MPU changes nothing.

Most sounds and speech missing on a 6803 game: factory reset, then set sound mode

Cause: Corrupt settings in the MPU's memory, not a hardware fault.

Checks

• Check the MPU battery or memory backup (about 3 V at the RAM's backup pin).

Fix

• Do a factory reset: Feature Options, Factory Reset, enter 65.
• Then set Basic Options, Sound Mode to 3.
• The game returns to coin play after the reset, so set free play again if wanted.

Systems

• Bally 6803

Games

• Party Animal

Related tips

• 6803 games with the Sounds Deluxe sound board
• Sounds Deluxe board noise or silence
• Sounds Deluxe 68000 board LED flash meanings
• Squawk & Talk speech or background sound crackles or drops out
• Bally 6803: sound board boots but no sound in play: check the sound setting

Source: Pinball Repair help group!! (Facebook group)