Trough switch versus outhole switch

On EM games the trough (ball count) switch is under the apron on the trough rails between the outhole and the shooter, and it advances the ball count. The outhole switch is the one the ball rests on in the outhole. They are different switches.

Systems

• Electro-mechanical

Related tips

• Ball never ejected from the outhole at game start: dirty score motor switch
• Manual ball-load games: ball release switch blocks a new game
• Start-up sequence keeps firing the outhole kicker: outhole switch barely closed
• Gottlieb resets but won't serve the ball: bonus unit not at zero

Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)