Check the ±100 V display supply at CN5
Steps
- Power the game and set the meter to DC volts.
- Measure from CN5 pin 1 (ground) to pin 3: about -100 V.
- Measure to pin 4: about +100 V. Readings from 95 to 105 V are good.
- Pin 6 should read +5 V; pin 5 is the key.
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
- Run alphanumeric displays at 91 V for longer life
- Alphanumeric displays show only a few digits at a time
- Alphanumeric supply: parts for the +100 V side
- Alphanumeric supply: parts for the -100 V side
- High-voltage display fuse F3 keeps blowing
- Rebuild the alphanumeric ±100 V section
- Alphanumeric power supply CN5 pinout
- Score display boards by game range
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)