Fix the display short before trusting a rebuilt supply
A shorted display glass or UDN chip can destroy a freshly rebuilt high-voltage section, because the fuse does not always blow fast enough. Clear the display-side fault first.
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
- Measure a rebuilt supply before reconnecting the displays
- Display voltages at 3J2, power supply D-11883/D-12246 (Taxi to Dr. Dude)
- Display voltages at 3J5, power supply D-8345 (High Speed to Swords of Fury)
- What the System 11 power supply board feeds
- Display supply low (under 90 V) after the resistors are changed
- Rebuilding the +100 V section of the power supply
- Rebuilding the -100 V section of the power supply
- GI connectors left the power supply after Cyclone
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell