Original 80/80A power supply design overheats CR7
A design error makes zener diode CR7 run hot and burn. The board also suffers from component leads trimmed into the solder fillet, which lets joints crack, so reflow suspect joints.
Systems
Related tips
- Reassemble and set up the 80/80A power supply
- Bench-test an 80/80A power supply in the game, part 1
- Bench-test an 80/80A power supply in the game, part 2
- Parts for the 80/80A power supply rebuild
- Mandatory 80/80A power supply rebuild
- Recommended extras for the 80/80A power supply
- Test and remove the 80/80A power supply's big transistor
- 80/80A power supply has 12 V but no +5 V
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)