The following information is taken from the August 1977 Gottlieb
Centigrade 37 manual. This may be helpful when debugging a startup
problem with this or other Gottlieb single-player games from the same
1. Inserting a coin will actuate the start relay 'S' or step the
replay unit. If the replay unit steps it is necessary to push the credit
button to start the game.
2. Pressing the replay button will actuate the subtract replay unit coil.
The 'on subtract replay unit' switch closes the circuit to 'S'
relay. This relay will lockin through its own switch and a motor 2B
3. The following sequence takes place through the closed switches on
3a. 'R' relay is actuated.
3b. The motor starts running.
3c. A motor 2C switch actuates the total play meter, 'AX' and
'JX' relays, resets the ball count unit and the advance unit.
3d. Another motor 2C switch resets the sequence bank and target bank.
4. When 'AX' relay is actuated, it is locked in by the armature of
'AX' relay reset coil. Through closed switches on 'AX' relay
and the score unit runout switches the units are reset to zero through
switches on motor 1A. When all units are reset and motor 2B makes,
'AX' relay reset coil is actuated. This releases the armature on
'AX' relay and opens the switches. The reset cycle is now
5. Place the ball in the out hole. When the ball makes the ball return
switch, 'O' relay actuates and locks in through a motor 2B switch.
'O' relay runs the motor. A motor 4C switch closes and actuates the
ball return coil which kicks the ball across the trough switch stepping the
ball count unit once, indicating first ball in play. The ball is now in the
runway and ready to be shot onto the playfield.
6. The ball count unit steps once for each ball played until it reaches the
third or fifth step depending on the setting of the 3-5 ball adjustment
plug. The third or fifth ball leaving the playfield actuates 'O'
relay, the motor urns and motor 1A pulses the add ball count unit to the 6th
step. The 6th position switch opens the circuit to the playfield.