192x64 display games have their own display supply fuse F3

Maverick to Batman Forever added a separate backbox 18 V fuse (F3), bridge and capacitor that feed a switching supply on the 192x64 display driver board. A blown lamp fuse (F2) therefore no longer upsets the display.

Systems

• Data East/Sega CPU Version 3b

Games

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

Related tips

• The 192 x 64 display makes its own high voltage
• 192 x 64 games: separate backbox supply for the display
• 192x64 display EPROMs must be 120 ns or faster
• Build your own 192 x 64 display power harness
• Running the large display on the bench
• Setting up a replacement 192 x 64 display
• Last resort for a flaky 192 x 64 display
• Large 192 x 64 display power connectors by display maker

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