Solenoid driver board: test points and regulators on the layout aid

The layout marks TP2 as the adjustable 185 V display supply (set with the 25K pot), TP3 as the +5 V bus, and TP4 as the unregulated DC input. Q20 is the +5 V regulator. The board receives +43 V for the coils, about +230 V unregulated for the display supply and +13 V unregulated for the 5 V regulator.

The display supply runs at 185-230 V DC.

Systems

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

Related tips

• Solenoid driver/regulator board test point voltages
• Solenoid driver/voltage regulator board test points
• Jumper TP1 to TP3 on the solenoid driver
• Ground mod for the solenoid return at J3 pins 23-24
• Skip the driver board mods on Baby Pac-Man
• Adding a ground jumper at C23
• Rebuilding the solenoid driver board high-voltage section
• High-voltage section parts on the solenoid driver board

Source: Bally - Stern Solenoid Driver Troubleshoot Aid