In How to test a power supply, the answers focus on testing ATX power supplies.
I have a pre-ATX power supply. How do I ...
- Safely test that the extracted old PSU is not producing expected voltage?
- Safely test the replacement PSU is producing good voltage before installing it?
By safely I mean with minimal risk to PSU and with no risk to server's motherboard etc from this preliminary test. I'm looking for a minimal test for reassurance / quick check, not full-load testing.
Generic answers are probably more useful for other people but, in case it helps, the details of this are:
It is for an Intel Pentium II server.
It is a 325W PSU.
The connectors are mostly conventional but it is proprietary (Compaq Proliant 1600)
The long lead goes to a front-panel "power on" LED and to a latching on/off switch. I can extract the switch and connect it to the end of the long lead for testing).
I have multimeters and can rustle up small test loads (fans, 10 W 10-20 Ω power resistors, etc)