Server PSU Hack – ACBEL FSA021 IBM 39Y7228, 12VDC 38A 460W

A guide on how to make the, ACBEL FSA021 IBM 39Y7228, server power supply run outside of its server enclosure.

You might also be interested in reading about the Server PSU Hack – HP DPS-800GB A, 12VDC 1000W or the Server PSU Hack – EMC2 API4SG10 12VDC 300W From a Dell PowerEdge M1000E.

ACBEL FSA021 IBM 39Y7228 Schematic

To reverse-engineer a power supply interface by trial-and-error, finding the GND pads and connecting them to other pads through a 1K or 10K resistor is a safe way to probe for possible start up conditions. Follow the discussion over at High Voltage Forum: https://highvoltageforum.net/index.php?topic=2365.0

A simple bridge between pin 1 and 2 is required to make the power supply output 12VDC.

The potentiometers was found to work as follows:

VR200 – Unknown function
VR201 – Voltage out adjustment
VR202 – Limiter, needs power cycle if tripped

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