Rectifier board test point voltages

TP1 feature lamps: about +5.4 V DC on AS2518-18, +6.5 V on -49 and -54. TP2 displays: about +230 V DC with J3 connected (150 V with J3 off). TP3 logic supply: +12 to 14 V with J3 on (13 to 16.5 V with J3 off). TP4 GI: 5.7 to 7.3 V AC. TP5 coils: about +43 V DC. Allow plus or minus 10 percent.

The score display supply runs at 170-230 V DC; keep hands off the rectifier and driver boards with power on.

Systems

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

Related tips

• Rectifier test point ranges with fuse and rectifier
• What each rectifier on the board feeds
• Rectifier test point reads below its range
• The three Bally rectifier boards
• Upgrading the AS2518-18 / -49 rectifier board
• Bench testing a rebuilt rectifier board
• Rectifier board test points
• No voltage at any rectifier board test point: burnt mains wire to the transformer

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)