Acceptable System 1 supply readings

+5 V should be 5.0 to 5.15 V (set it to about 5.10 V with the top-left pot); -12 V should be -11.9 to -12.1 V. The unregulated outputs run high: about 48 V on the 42 V line, 8.6 V on the 8 V line or 65 V on the 60 V line is acceptable, and the 60 V can be trimmed.

Systems

• Gottlieb System 1

Related tips

• System 1 power supply outputs
• Quick checks on the similar System 1 power supply
• The 5/12 V supply is only half-wave rectified
• Replacing power supply filter capacitor C1
• The mandatory System 1 ground modifications
• Spare diodes, capacitors and other parts for System 1
• Getting to the power supply solder side
• Power supply bring-up, step 1: inputs

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