System 1 power supply outputs

The power supply board takes AC from the bottom-panel transformers and makes +5 V and -12 V for the CPU, +8 V and +4 V display offsets, and +60 V and +42 V for the displays.

Systems

• Gottlieb System 1

Related tips

• Power supply output connector pins
• Quick checks on the similar System 1 power supply
• No +5 V or only 2.4 V from the power supply
• Replacing power supply filter capacitor C1
• Acceptable System 1 supply readings
• Getting to the power supply solder side
• Power supply bring-up, step 1: inputs
• Power supply voltage drifts or overvoltage trips

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)