Quieting a buzzing coin lockout relay

Steps

• The relay on the coin door is energised whenever the game is on, letting coins into the box; switched off, coins go to the return.
• For home use, disconnect or cut one wire to the relay.
• Fix the armature in the pulled-in position so any coin mech still accepts coins.
• Tape or insulate the free wire end so it cannot touch the door and short.

Systems

• Electro-mechanical

Related tips

• Gottlieb Ax/Bx/Dx relays, coin unit and player unit: what each does
• Credits register but the start button does nothing
• A hold relay hums or buzzes
• Bally coin unit
• Gottlieb relay return springs
• How latch-trip (interlock) relays work
• Relay banks and their reset coil
• Relay coil resistance and frame sizes

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