v3 power supply testing

hi - i am about to test my F5. I am planning the following steps

1)test the softboard unconnected

2) connect softboard -> transformer (unconnected secondary)

3) transformer -> v3 PSU. not connected to the F5 board. The question is if it is unconnected, how would the PSU discharge itself?

4) test L and R channel separately.

Would this strategy work? i got a light bulb tester widget.

thanks alot

Philip