How the -49 rectifier board differs from the -18

The AS2518-49 is the -18 with BR1 replaced by two heat-sinked 30 A rectifiers that turn 9.2 V AC into 6.5 V DC for the feature lamps, plus a ninth pin on J1 to double the feature lamp line. Otherwise it works and connects the same way.

Systems

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

Related tips

• Replacing the -49 VARO pair with one bridge
• What each rectifier on the board feeds
• Rectifier board test points
• Rectifier board test point voltages
• The three Bally rectifier boards
• No TP1 voltage on the -49 board: failed VARO rectifiers
• Upgrading the AS2518-18 / -49 rectifier board
• Bench testing a rebuilt rectifier board

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