I just took apart my original power supply (trying to determine if that's the fault in my current problem), and it's very straightforward. Wires off the AC plug entering transformer, wires to the 9v tip coming off the transformer. No board, no visible regulators (it's conceivably possible that the actual transformer has a 7809 in the cavity somewhere, but I'd doubt it). It's for all intents and purposes a very generic 9v power supply. In fact, it provides 3000mA when the board minimum is 2000mA.
In my case, my problem isn't the power supply. It is wired correctly and tests fine... My board won't turn on at all. A few months back, I replaced the input jack. (I build PCBs for a living, so no sweat, there). That worked till just recently, now the cpu is getting no power. Time to start tracing circuits.
Harpe41, My guess is, if it's powering the CPU, that something is blown between the CPU and the outputs. That could have happened when the original PS died on you. A blown resistor on the way to the outputs is enough to interrupt signal flow. Finding it... replacing it... that's trickier.
