Adding jumper wires across DB1 and C11-C14 (520-5047-03)

Steps

• Remove the power supply board.
• Run one 18-gauge wire from the DB1 + terminal, daisy-chained across the + terminals of all four capacitors C11-C14.
• Run a second 18-gauge wire between DB1's - terminal (diagonal to the +) and the C1 - terminal.
• Refit the board. This is less critical on this supply but still worthwhile.

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
• Three backbox bridges on 192x64 DMD games
• 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
• Power supply CN1 pinout, pins 1-6

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