Power supply LEDs show voltage present, not correct

LED 1 means the 12 V DC input is reaching the power supply and LED 2 means some +5 V output is present. LED 2 lights even when the 5 V is badly off, so always set and check the 5 V with a meter, never by the LED.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• How the 80/80A power supply makes its four voltages
• Typical voltages inside the 80/80A power supply
• 80/80A power supply semiconductors
• 80/80A power supply capacitors
• Check power supply outputs with the output cables unplugged
• Power supply ripple and regulation checks
• 80/80A power supply test points and connector pins
• Power supply output wrong

Source: System 80 Service Manual, Gottlieb