System 1 sound: chimes and two sound boards
The first three games used a three-chime unit. Close Encounters brought a simple tone sound board fed by the same three driver transistors. From Totem a microprocessor sound board picks sounds at random from those three lines; it uses the Rockwell R3272-12, which is no longer made. Both sit in the lower cabinet by the knocker.
Systems
Related tips
- Replacing a sound board with a chime box
- Second sound board chips dying from a bad ground
- What boards a System 1 game has
- How the sound PROM is marked
- One tone sounds constantly at power-up, even with another driver board: MPU fault
Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)