Zombie snatcher uses and elevator assembly to lift the pucks to the top of the game once they have been won. The puck elevator uses a DC motor to lift the bucket to the level of the playfield and then uses another DC motor to drive a sweeper arm to knock the pucks onto the playfield.
The Lift motor is driven by a low voltage relay board located on the bottom of the assembly. The relay board has a 3 pin connector for its input signals and a 2 pin connector for the output signals. Pin 1 on the input connector is a constant 12vdc (orange wire), when the motor is sent up the I/O board applies a ground on pin 2 (violet/black wire), and when the motor is brought down the I/O board applies a ground on pin 3 (brown/violet wire). The output voltage from the relay is 12vdc and when the direction of the motor is reversed the polarity of the voltage is reversed causing the motor to rotate the opposite direction. Pressing M on the keyboard will cause the elevator assembly to activate.
The sweeper motor on the elevator is also driven by second relay board mounted to the bottom of the elevator assembly. The sweeper motor uses a magnetic coupler mounted to the output shaft of the motor which then rotates the sweeper arm to clear the pucks. The motor relay board has a 3 pin connector for its input signals and a 2 pin connector for the output signals. Pin 1 on the input connector is a constant 12vdc (orange wire), pin 2 of the input connector is a violet wire which a ground is applied when the motor is told to rotate, and pin 3 is a brown/violet wire which a ground is applied when the motor is told to reverse directions.
The elevator assembly uses a mechanical switch to register the bucket being in the down position. If the game does not see the switch the elevator will cycle up and down and all 6 tombstones will flash yellow. The switch input can be measured at the I/O board located in door 3 at connector J1 between pin 2 (white/violet wire) and pin 15 (black wire) you will see 3.3vdc going to 0 when the switch is pressed. The home switch can be located in door 3. If you connect a keyboard to the computer and press F1 you will bring up a developer menu in the upper left of the screen, when the bucket is down the first line will say "bucket home=true" if the line reads false then the switch input is not being seen.