Three backbox bridges on 192x64 DMD games

The super-size display needs its own supply, so these games have a third backbox bridge, fuse and filter capacitor. Bridge DB1 on the 520-5047-03 power supply feeds the +5 V logic, and the bridge on the PPB makes the +50 V.

Systems

• Data East/Sega CPU Version 3b

Games

• Batman Forever
• Baywatch
• Mary Shelley's Frankenstein
• Maverick

Related tips

• Won't boot, only some lamps on: bad capacitor joints on the power supply board
• Adding jumper wires across DB1 and C11-C14 (520-5047-03)
• Power supply board versions are not interchangeable
• No or low +5 V from the power supply
• Z1 on the power supply is a varistor, not a diac
• Low-power solenoid voltage drops to under 5 V
• Power supply board versions and their +5 V filter capacitors
• Adding jumper wires across DB1 and C4 (520-5047-00/-01/-02)

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part One, Clay Harrell (pinrepair.com)