Run alphanumeric displays at 91 V for longer life
Swap the 100 V 1 W zeners at D9 and D10 (1N4764) for 91 V 1 W zeners (1N4763). The displays become slightly dimmer but last much longer.
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
- Change zener diodes Z2 and Z4 for longer display life
- Fit 91 V zeners at Z2/Z4 to extend display life
- Alphanumeric displays dim or dead
- Check the ±100 V display supply at CN5
- Alphanumeric displays show only a few digits at a time
- Displays weak with low 100 V even unplugged
- Rebuild the alphanumeric ±100 V section
- Alphanumeric supply: parts for the -100 V side
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)