Hi;
The board evo d300 (convert. minitower) have a 24 pin power connector. The pin 12 is "FC - fan command" and pin 24 is "FS - fan sink". ¿What does it mean?

Thanks in advance.

pin12 should give access to the fan speed control sensors in the PSU
pin24 should give access to the sinks temperature sensor in the PSU

Looks like your PSU fan speed can be controlled and sink temp can be monitored.

The voltages at the connector pins, of the previous message is as follow:
1 - +3.3 13 - +3.3
2 - +3.3 14 - -12
3 - RTN 15- RTN
4 - +5 16- PS On
5 - RTN 17- RTN
6 - +5 18- --
7 - RTN 19- RTN
8 - FO 20- -5
9 - +5 Aux 21- +5
10- +12 22- +5
11- +3.3 Aux 23- +3.3
12- FC 24- FS
----------------------------
Legend:
RTN - Return (signal ground)
FO - Fan off
FS- Fan sink
FC- Fan command
------------------------
In the ATX12V, the pin 8 PW-OK and 18 is Ground.
So, I don't understand the fan signals (voltage).
Any explanation will be preciated.

Thanks in advance.

Well, since your psu fan is a variable speed fan and a temperature sensor is installed with it, those two pins are as I said earlier for controlling the fan speed and reading the temp. To understand the value, you may need the datasheet.
What are you trying to do anyway?
Writing a monitoring application?

Thanks CuratoR for your concern,
The problem is that I don't have the right psu, and no way to get one (compaq PN 243890) so I have to build a connector (adaptor) to use other kind of psu. To do so, I need as much as posible details about the cable signals of the psu and avoid frying the board - I got lot of information about psu (ATX12V, EPS12V, 20 pins, 24 pins, etc) but in the case of evo d300 I found the previous specifications at the Tecnical Reference Guide -http://h200002.www2.hp.com/bc/docs/support/UCR/SupportManual/TPM_329001-001_rev4_us/TPM_329001-001_rev4_us.pdf
And the psu, seems to me something different, but the most, is those FO, FS, FC signal at the pins 8, 12 and 24.

Any other sugestion?