What the System 11 auxiliary power driver board does
On later System 11 games the auxiliary power driver board makes the +50 V and +25 V coil supplies, holds the bank select relay and the 50 V coil drivers, carries the coil diodes that used to be on the coils, and holds the coil fuses.
Systems
Related tips
- What the auxiliary power driver board holds
- Auxiliary power driver board fuses
- Circuit dead through the auxiliary power driver board: open zero-ohm jumpers
- Testing coil diodes on the auxiliary power driver board
- CPU and driver board transistors by position
- Testing driver transistors in diode mode (board out of game)
- When a driver fails, replace its pre-driver as well
- Coil stays on after the CPU-side driver parts were replaced
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer