Rebuild the alphanumeric ±100 V section
Steps
- Do this whenever the high-voltage fuses blow. Use the parts lists for the positive and negative sides.
- Clip the old parts out, then clear each hole with a solder sucker.
- Fit the new parts, standing the resistors slightly off the board, and solder both sides.
- With CN5 still unplugged, power up and check the outputs read 90 to 105 V.
- Only then reconnect CN5 to the displays.
The display power supply carries about 100 V or more; work on it with the game unplugged and let the capacitors discharge.
Systems
Related tips
- Alphanumeric supply: parts for the +100 V side
- Check the ±100 V display supply at CN5
- Run alphanumeric displays at 91 V for longer life
- Displays weak with low 100 V even unplugged
- High-voltage display fuse F3 keeps blowing
- Alphanumeric displays dim or dead
- Set an aftermarket "B" display supply for alphanumeric games
- Alphanumeric games need the 520-5000-00 supply
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)