Alphanumeric supply: parts for the +100 V side

TR3 MJE340 (or MJE15030, or a 2N3440 with a star heat sink); TR1 2N5401; D6 1N5228 or 1N4730A; D5 1N4004; D9 1N4764 or the 91 V 1N4763A; R8 39k 1-2 W flameproof; R12 680 ohm 1/2 W; R11 330k 1/2 W; C13 0.1 µF 500 V (250 V works) metal polyester.

The display power supply carries about 100 V or more; work on it with the game unplugged and let the capacitors discharge.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3

Related tips

• Rebuild the alphanumeric ±100 V section
• Check the ±100 V display supply at CN5
• High-voltage display fuse F3 keeps blowing
• Set an aftermarket "B" display supply for alphanumeric games
• Alphanumeric games need the 520-5000-00 supply
• Displays weak with low 100 V even unplugged
• Alphanumeric displays dim or dead
• Alphanumeric displays show only a few digits at a time

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