Rectifier board J2 (to cabinet) pins

J2-1: 7.3 V AC GI supply. J2-2: +43 V DC solenoid supply. J2-3: unused. J2-4: unused ground. J2-5: 7.3 V AC GI return. J2-6: AC line high. J2-7: AC line low. J2-8: key. J2-9: flipper solenoid return. J2-10: AC line ground.

J2-6, J2-7 and J2-10 carry mains; unplug the game before working on this connector.

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35
• Stern MPU-100
• Stern MPU-200

Related tips

• 12 V at the rectifier board but not at the MPU
• Rectifier board test points
• No +12 V at the MPU: check the rectifier board
• Rectifier board fuse ratings (all Bally 1977-1985)
• Replace browned rectifier header pins and housing pins together
• No 12 V at rectifier TP3 even with a good F3
• Why Trifurcon pins
• Rectifier board J3 pin functions (pre-Xenon backbox transformer)

Source: Voltage Test Points on the Boards