Where the boards sit in a System 3 dot matrix backbox
In the labelled backbox photo (a dot matrix game), the aux sound board A20 is at the top left with the sound board A6 below it; the aux power supply A5 is top centre with the +5 V supply A2 and its large heat sink below it; the DMD controller A8 is at the top right; the CPU A1 is at the lower right and the driver board A3 across the lower left. The optional communications adaptor plugs in beside A8.
Systems
Related tips
- Suddenly won't boot, CPU and DMD LEDs solid, display dark: reseat playfield ground plugs
- Gottlieb System 3: constant hum from the speaker at idle
- Gottlieb System 3: loud screeching from the speakers: replace the sound board capacitors
- System 3 game dead after a power cycle, CPU LED does nothing: bad F2 fuse holder
- Gottlieb System 3 CPU passes test ROM, then watchdog trips: torn trace and wrong parts
- Sound barely audible though music plays: rebuild the aux power supply connector
- Low battery error comes back a month after a new coin cell: the new cell was bad
- One switch row works in test but not in play: overheated strobe MOSFET Q36
Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)