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