The following information is taken from the November 1976 Gottlieb Target
Alpha manual. This may be helpful when debugging a startup problem with
this or other Gottlieb 4-player games from the same period.
1. Inserting a coin or pushing the replay button actuates 'S' relay
2. This relay will lock-in through its own switch and a motor 2B switch.
3. 'S' relay starts the motor running.
4. 'AX' relay actuates and the 'coin' unit subtracts through switches
on 'AX' and 'S' relays and switches on motor 4C and motor 1A.
'Q' relays de-energizes when 'AX' relay operates.
5. When 'AX' relay actuates, the reset relays 'Z1' and
'Z2' are energized in sequence by rivets on the 'Player' unit,
through switches on 'AX' relay.
5a. Motor 1A steps the 'Player' unit, through switches on 'AX' relay
and 'P5B', to the 20th position energizing 'Z1'.
5b. When 'Z1' is energized the 1st and 2nd player score units reset
to zero through switches on motor 1A, motor 4A and 'Z1'. When all
score units of the 1st and 2nd player are at zero the player unit steps to
the 21st position through a normally closed switch on 'Z2' and
normally closed switches on all score units of the 1st two players,
actuating 'Z2' relay. The 3rd and 4th player score units now reset
through switches on motor 1A, motor 4A, and 'Z2'. The player unit
continues to its zero position through the closed switches on 'Z1',
'Z2', 'P5B' and motor 1A until 'P5B' opens.
6. When 'P5A' on the player unit closes, 'AX' and 'BX'
relays reset through motor 4C and switches on 'DX', and 'R'
relays. The reset cycle is now complete.
7. Inserting additional coins or pushing the replay button will step the
'coin' unit through switches on 'DX' and 'S' relays and a
switch on motor 4C. The replay button circuit opens when 'coin' unit is on
8. Place the ball in the out hole. The ball return switch closes and
completes the circuit to 'O' relay through the normally closed
switches of 'DX', 15th position 'Bonus' unit, motor 1C, motor 2B,
'Q', 'AX', and 'S' relays. 'O' relay locks-in.
Through switches on motor 4C, 'BX', and 'O' the ball return
coil actuates kicking the ball onto the runway.
9. The remaining balls that enter the outhole are kicked across the trough
switch which pulls in 'P' relay. 'P' relay runs the motor.
Switches on 'E', 'DX', motor 2C, 'P', 'BX', and
motor 1A advances the 'Player' unit the required number of steps determined
by the 'Player' unit switches and the 'Coin' unit.
10. The 3-5 ball adjustment changes the number of balls played per game.
The third or fifth ball leaving the playfield will trip the 'last ball' relay
'BX' through switches on 'E', 'DX', rivets on the
player unit disc, and 'O' relay.