The A6 sound board

A6 has two 65C02 processors, a dual DAC and a command input from the CPU board. It needs +5, +12 and -12 V plus a power-up reset from the CPU board; SW2 resets it by hand. Its two 27256 EPROMs (D1 and Y1) hold the music and effects.

Systems

• Gottlieb System 3

Related tips

• Sound needs the A1P4 cable
• Both sound board LEDs dark
• No sound, or weak sound
• A5, A6, A8 and A20 plug identification
• Gottlieb System 3: loud screeching from the speakers: replace the sound board capacitors
• No sound after the 12 V plug went on the speaker lead
• Turning down or silencing the sound

Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)