Power supply ripple and regulation checks
The manual checks the supplies on a scope with AC coupling: the 12 V input ripple at 2 V per division, the 5 V output at 5 mV per division, and the 60 V output at 50 mV per division. A 5 V or 60 V output showing ripple anywhere near the size of the 12 V input ripple means a failed filter capacitor or regulator.
Systems
Related tips
- 80/80A power supply semiconductors
- 80/80A power supply capacitors
- Check power supply outputs with the output cables unplugged
- How the 80/80A power supply makes its four voltages
- Both halves of the power supply limit their current
- 80/80A power supply test points and connector pins
- Typical voltages inside the 80/80A power supply
- Power supply LEDs show voltage present, not correct
Source: System 80 Service Manual, Gottlieb