Display voltages at 3J5, power supply D-8345 (High Speed to Swords of Fury)
Unplug 3J5 and measure on the board header with power on: pin 1 ground, pin 3 -100 V DC, pin 4 +100 V DC, pin 6 +5 V DC. Expect 90 to 105 V on the high-voltage pins, or about 90 V with 1N4763 zeners fitted.
The display supply runs at about 100 V DC (plus and minus) with large filter capacitors; work with the game off and unplugged, and measure live only with insulated probes.
Systems
Related tips
- System 11 power supply versions D-8345 and D-12246
- High-voltage supply rebuild parts, System 3 to 11C
- What the System 11 power supply board feeds
- Fitting the high-voltage kit
- Fix the display short before trusting a rebuilt supply
- Rebuilding the +100 V section of the power supply
- Rebuilding the -100 V section of the power supply
- Measure a rebuilt supply before reconnecting the displays
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell