reverse-engineering power

OK, Great Minds, there are two pins in the standard center/outer config associated with most wall warts. There are few computers easier to open up than this one. Refer to figure 1: http://www.yowza.com/classiccmp/oddball/ht35.jpg There seems to be a transformer that helps out with the display voltage, but it's the only thing in the box that's hard to get to. I can tell it's on a PCB labeled P/N 665-0454 (just in case it matches one sitting by you). Here's where software-boy gets in trouble. There's a part near the DC-in that looks like it by be a transistor. The board label is D3 and the part is labeled 1R OE 30WQ0AF (maybe). The center conductor buzzes on the outer two pins of this three-pin device. Also nearby is a 16V 470uF cap, but it's not easy to trace the connections. The center conductor buzzes with what I think is the negative terminal of a tantalum cap on the trace-side of the board. Are those clues enough to nail down the polarity? -- Doug