The problems associated with the original Gottlieb driver board are numerous - connections to the CPU can be corroded and cause poor driver/lamp signals; the MPS-U45 is a very difficult transistor to find; and the old 2N3055 transistors burned holes through the PCB. Ni-Wumpf has redesigned the System 1 driver board to address these issues, and adds in a few more features that should prove useful:

• Each solenoid has fault detection circuitry that identifies failed playfield/driver board components
• FET solenoid transistors
• Higher rated FET components for all circuits to deliver much higher coil response
• Surface Mount components for PCB density. Transistor arrays to reduce cost
• Modern component architecture uses currently available parts. SMT rework is a bit harder to service but less expensive in component costs.
• Diode isolated grounding to prevent playfield lamp problems from the board

Each driver circuit is equipped with fault detection circuitry and LED's that will blink when actuatued, and light steady to indicate circuit failure.

Note that the LED will remain lit when a game does not support the associated playfield driver components. Similarly, it will light if the fuse is blown, or the coil is shorted.

The board was designed to follow the original Gottlieb component functionality as described in the original driver board. So where the original board had ICs Z1 - Z9, this board has the same numbered components. From there, it is best to follow the enclosed schematics to determine fault isolation.