WPC power driver bridge rectifiers and +5 V regulator
BR1 makes +18 V for the lamp columns, BR2 the input for the +5 V regulator, BR3 the 50 V coil supply, BR4 the 20 V flash lamp supply and BR5 the +12 V supply. The +5 V regulator is an LM323K at Q1.
Systems
Related tips
- Resets: +5 V at the driver board test point is low
- Resets remain after rectifiers, caps and connectors are done
- Bridge rectifiers to use on WPC-S and earlier driver boards
- Voltages made by the WPC power driver board
- Supplies made on the WPC power driver board
- Bridge positions on WPC-S and earlier driver boards
- Replacing a driver board bridge rectifier without tearing traces
- Replacing the 78H05 +5 V regulator
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer