If Focus is the name of the company and they're out of business, maybe you could find an archived version of their website at www.archive.org and hopefully find something?

Alternatively, you really just have to use common sense and logic and just "figure it out".  Does one of the pins connecting to the power jack go to ground?  Can you trace one side using a dmm on diode mode to see if maybe one pin goes to the plus side of an electrolytic cap?  If so that's the positive side, etc...

As for voltage, who knows.  Check for the chip numbers on the board and look up their datasheet.  Usually voltages in are mentioned, and it might give you a clue.

It's time you did some detective work.  Good luck.