Quoted from Neal_W:

There is a section in the manual about that. See the manual for the diagram.
The ball should not be launched into the air during a fast pitch. This is adjustable by the top of the pitch unit. Carefully lift both of the pitch "spring steel" covers (WARNING, the edges are extremely sharp), and bend the metal deflector tab downward. But, do not lower it too much so that it prevents a ball from traveling through the guide. The smaller of the 2 "spring steel" guides should also be firmly pressing down on the ball guide to prevent the ball from lifting. When this adjustment is done, re-check the slow pitch and make sure that the ball is still being pitched. If the ball is not being pitched, release some tension on the smaller spring steel guide.
Also:
Try test 1 - switch test. You can confirm your buttons are working reliably to start with.
You can try test 13 - pitch test and what results you get there.
You can see in the manual, they label different solenoids for each pitch (solenoid table). That just means different transistors/wiring take care of the 3 speeds of pitches going to the motor. The motor regulator board connects to the motor with 3 different resistors for each pitch. When the transistor turns on with a larger resistor it runs slower and transistor connected to the smaller resistor makes it run faster. If the cable (J126) going from the driver board to the motor regulator board had a bad connection, some pitches might not work.
22 Fast Pitch Blu-Bik Vio-Orn J126-7 Q30
23 Medium Pitch Blu-Vio Vio-Orn J126-8 Q34
24 Slow Pitch Blu-Gry Vio-Orn J126-9 Q32