Gottlieb Ax/Bx/Dx relays, coin unit and player unit: what each does

On 1975 and later Gottlieb multi-players the bottom cabinet has a coin unit, which counts how many players were bought, beside the Q (game over) relay, the Ax (reset control) relay and the Bx and Dx relays, which on the relay panel's own labels are the last ball (Bx) and first ball (Dx) relays. The backbox player unit tracks which player and ball are up. The Ax/Bx short-throw latch relays need perfect switch adjustment for the game to work.

Systems

• Electro-mechanical

Games

• Target Alpha

Related tips

• Gottlieb player unit
• Gottlieb coin unit (1975 to 1979)
• Bally coin unit
• Gottlieb relay return springs
• Player 1 'up' lights stay off during play: clean the coin unit contacts
• Gottlieb AS relay (miniature match stepper)
• Gottlieb relay coil equivalents and resistance
• Quieting a buzzing coin lockout relay

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part Two, Clay Harrell (pinrepair.com)