Table of Contents


Question: My Axum doesn't seem to boot, voltages aren't right, how do I adjust the Power Supply?

Answer: Link: Follow the instructions on this page.



How to adjust the 5 volt of the Axum PSU


Front side


Rear side


Backplane measurepoints


  1. First adjust the front side potentiometer (Orange circle) to the Middle of the potentiometer.
  2. Connect a voltage measurement device with the “-” to the screw at the rear side (Green circle).
  3. Connect the “+” of the voltage measurement device to the coil pin at the rear side (Blue circle).
  4. Now power on the Power supply.
  5. Without “load” the 5 volts should be adjusted to 5.35 volts (or maximum) at the rear side potentiometer (Red circle).
  6. Now place the Power supply in the Axum.
  7. When you have a single Power supply power on the Axum, with a redundant Power supply only power on one power supply.
  8. Measure the 5 volt between the points (Blue circle) and Ground (Green circle) at the backplane.
  9. Now fine adjust the potentiometer at the front (Orange circle) until you measure 5.15 volts for a single power supply or 5.20 volts for a reduntant power supply.
  10. Repeat these steps for the second power supply.
  11. The voltage measured at the measure point (Yellow circle) of the backplane should be near -15 volts (-16 is also okay).
  12. The voltage measured at the measure point (Purple circle) of the backplane should be near +15 volts (+16 is also okay).


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