The 192 x 64 display may go blank or reset now and then; in normal running a brief blank screen between attract mode displays is expected and not a fault.

Large 192 x 64 display blanks or resets (Sega bulletin 106)

Cause: The display controller's 68000, running at 12 MHz, needs a full 5 V. Aging cable connections drop the voltage and power reaching it.

Checks

• Measure +5 V at the display controller with the game running.

Fix

• Fit harness kit 500-6326-00, which feeds +5 V straight from power supply 520-5047-03 to the display controller; it takes under ten minutes.

Systems

• Data East/Sega CPU Version 3b

Games

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

Related tips

• 192 x 64 display blanks out or the game resets
• Install kit 500-6326-00, part 2: display controller end
• Install kit 500-6326-00, part 1: power supply end
• Large display still unstable after the harness fix
• Running the large display on the bench
• Large 192 x 64 display power connectors by display maker
• Large display restarts when both flippers are held
• Display freezes or shows garbage after warming up: reseat the display controller ROMs

Source: Large Dot Display (192 X 64) Optional Enhancement Cable Wiring Harness Update Kit (Service Bulletin 106), page 1 of 2, Data East