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Troubleshooting Williams/Bally WPC System & System 11. 

Motocross Go! 

Equiped with the System 23 Game board assembly. The Deluxe model of the Motocross Go uses pneumatic control for the bike motion and the motor feedback for the handle. 

The choice of pneumatic control over electric motors allows more suitable and accurate simulation. Two air springs positioned approximately below the seat can lift the front or the back of the bike and let you feel the texture of the terrain and the vibration of the motor. The left and the right inclination of the bike is controlled by the air cylinder in the base of the bike assembly. The feedback force for the handle bar is provided by an electric motor.

The base of the bike assembly is also housing the Air Valve Assy containing 5 air valves, AMC PCB (controlling the motor and the air valves), ASCA-1B PCB (handling inputs & outputs). The base of the projector unit is housing the System 23 Board Assy and the compressor.

A few differences can be noticed when comparing this system to the previous System 22.

  • The main game board requires +5V, +12V and 3.3V. The 3.3V is another logic voltage, seen more and more used in designs of modern microprocessor based circuits.
  • The main game board does not handle switch inputs and analog inputs (potentiometers) directly. All input devices are connected to the ASCA-1B PCB (input/output PCB).
  • There is a serial communication between the Main PCB (the Game Board) , the ASCA-1B PCB and the AMC PCB i.e. this arrangement simplifies the machine wiring as only 4 wires are needed to make the connection between these boards.


As would be expected this machine can work in link mode with up to 4 machines linked together. The option setting allows a fair bit of adjustment of the game difficulty. There are 3 courses – beginners, intermediate and advanced. Each course is individually adjustable. 4 levels of difficulty are available.


A good set of tests is provided to test all inputs and outputs including the pneumatic control.

Same as with the earlier System 22 , "Bike Initialization " (input initialization) must be carried out when the game board or potentiometers are replaced.



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