Rectifier board J1 (to playfield) pins

J1-1 and J1-2: 7.3 V AC GI return. J1-3: unused. J1-4: key. J1-5 and J1-8: 7.3 V AC GI supply. J1-6: +43 V DC solenoid supply. J1-7: +5.4 V DC switched (feature) lamp supply. J1-9 (AS2518-49 board only): +5.4 V DC switched lamp supply.

Systems

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

Related tips

• Rectifier board J3 (to backbox boards) pins
• 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
• F4 still blows with the playfield coils out of circuit

Source: Voltage Test Points on the Boards