Display voltages at 3J2, power supply D-11883/D-12246 (Taxi to Dr. Dude)
Unplug 3J2 and measure on the header with power on: pin 1 (orange) -100 V DC, pin 3 (brown) +100 V DC, pin 5 (black) ground, pin 6 (gray) +5 V DC. Expect 90 to 105 V, or about 90 V with 1N4763 zeners.
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
- Routine high-voltage changes on every System 11 power supply
- What the System 11 power supply board feeds
- 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
- GI connectors left the power supply after Cyclone
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell